TY  - JOUR
AU  - Matović, Branko
AU  - Maletaškić, Jelena
AU  - Maksimović, Vesna
AU  - Dimitrijević, Stevan P.
AU  - Todorović, Bratislav
AU  - Pejić, Milan
AU  - Zagorac, Dejan
AU  - Zagorac, Jelena
AU  - Zeng, Yu-Ping
AU  - Cvijović-Alagić, Ivana
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5959
AB  - Multicomponent oxide with pyrochlore structure (A2B2O7), containing 7 different A-site cations and 3 B-site cations in equiatomic amounts, was synthesized. Powders with nominal composition (La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7 were fabricated through a reaction of metal nitrates (A-site) and metal chlorides (B-site) with sodium hydroxide during the solid state displacement reaction. Room temperature synthesis initially resulted in the obtainment of amorphous powders, which crystallized after subsequent calcination to form single crystalline compounds. Crystalline high-entropy ceramic powders formation took place at temperatures as low as 750 °C. During calcination, defective fluorite (F-A2B2O7) and crystal pyrochlore (Py-A2B2O7) structures coexist. A large number of cations induce the obtainment of stable high-entropy pyrochlores. Results showed that sintering at 1650 °C lead to pure crystalline single-phase pyrochlore formation. High-density ceramic, free of additives, was obtained after powders were compacted and subjected to pressureless sintering at 1650 °C. Multicomponent pyrochlore structure was investigated using the theoretical and experimental multi-methodological approach.
PB  - Sociedad Espanola de Ceramica y Vidrio
T2  - Boletin de la Sociedad Espanola de Ceramica y Vidrio
T1  - Multicomponent solid solution with pyrochlore structure
T1  - Solución sólida multicomponente con estructura de pirocloro
DO  - 10.1016/j.bsecv.2023.01.005
ER  - 

@article{
author = "Matović, Branko and Maletaškić, Jelena and Maksimović, Vesna and Dimitrijević, Stevan P. and Todorović, Bratislav and Pejić, Milan and Zagorac, Dejan and Zagorac, Jelena and Zeng, Yu-Ping and Cvijović-Alagić, Ivana",
year = "2023",
abstract = "Multicomponent oxide with pyrochlore structure (A2B2O7), containing 7 different A-site cations and 3 B-site cations in equiatomic amounts, was synthesized. Powders with nominal composition (La1/7Sm1/7Nd1/7Pr1/7Y1/7Gd1/7Yb1/7)2(Sn1/3Hf1/3Zr1/3)2O7 were fabricated through a reaction of metal nitrates (A-site) and metal chlorides (B-site) with sodium hydroxide during the solid state displacement reaction. Room temperature synthesis initially resulted in the obtainment of amorphous powders, which crystallized after subsequent calcination to form single crystalline compounds. Crystalline high-entropy ceramic powders formation took place at temperatures as low as 750 °C. During calcination, defective fluorite (F-A2B2O7) and crystal pyrochlore (Py-A2B2O7) structures coexist. A large number of cations induce the obtainment of stable high-entropy pyrochlores. Results showed that sintering at 1650 °C lead to pure crystalline single-phase pyrochlore formation. High-density ceramic, free of additives, was obtained after powders were compacted and subjected to pressureless sintering at 1650 °C. Multicomponent pyrochlore structure was investigated using the theoretical and experimental multi-methodological approach.",
publisher = "Sociedad Espanola de Ceramica y Vidrio",
journal = "Boletin de la Sociedad Espanola de Ceramica y Vidrio",
title = "Multicomponent solid solution with pyrochlore structure, Solución sólida multicomponente con estructura de pirocloro",
doi = "10.1016/j.bsecv.2023.01.005"
}

Matović, B., Maletaškić, J., Maksimović, V., Dimitrijević, S. P., Todorović, B., Pejić, M., Zagorac, D., Zagorac, J., Zeng, Y.,& Cvijović-Alagić, I.. (2023). Multicomponent solid solution with pyrochlore structure. in Boletin de la Sociedad Espanola de Ceramica y Vidrio
Sociedad Espanola de Ceramica y Vidrio..
https://doi.org/10.1016/j.bsecv.2023.01.005

Matović B, Maletaškić J, Maksimović V, Dimitrijević SP, Todorović B, Pejić M, Zagorac D, Zagorac J, Zeng Y, Cvijović-Alagić I. Multicomponent solid solution with pyrochlore structure. in Boletin de la Sociedad Espanola de Ceramica y Vidrio. 2023;.
doi:10.1016/j.bsecv.2023.01.005 .

Matović, Branko, Maletaškić, Jelena, Maksimović, Vesna, Dimitrijević, Stevan P., Todorović, Bratislav, Pejić, Milan, Zagorac, Dejan, Zagorac, Jelena, Zeng, Yu-Ping, Cvijović-Alagić, Ivana, "Multicomponent solid solution with pyrochlore structure" in Boletin de la Sociedad Espanola de Ceramica y Vidrio (2023),
https://doi.org/10.1016/j.bsecv.2023.01.005 . .

TY  - JOUR
AU  - Matić, Tamara
AU  - Zebić, M. Ležaja
AU  - Miletić, Vesna
AU  - Cvijović-Alagić, Ivana
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
AU  - Veljović, Đorđe
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5362
AB  - The aim of this study was to investigate the influence of binary Sr, Mg ion-doping compared to the single-ion doping effects on the phase composition and morphology of hydrothermally obtained calcium hydroxyapatite (HAP) powders and on the phase composition, microstructure, and mechanical properties of the sintered materials. Additionally, the focus of this study was to investigate the possible utilization of the binary doped Sr,Mg-HAP compacts as dentin substitutes in restorative dentistry by evaluating their bonding ability with commercially available restorative materials using the shear bond strength test (SBS). The hydrothermally obtained mono-doped Mg5 and Sr5 showed the monophasic apatite structure, while in all co-doped samples β-TCP phase was formed, resulting in biphasic calcium phosphate (BCP) powders. It was confirmed that co-doping with Sr and Mg ions led to the thermal stabilization of the β-TCP phase by suppressing the phase transition into α-TCP when sintered at 1200 °C. Moreover, the co-presence of Mg ions significantly improved the hardness of Sr-doped HAP from 3.74 to 5.02 GPa. Sr,Mg-HAP dental inserts were found to achieve sufficient bonding (13.53 MPa) through the micromechanical interlocking with Z250 dental composite and Single Bond Universal dental adhesive applied with a total etch approach. The SBS values obtained for the SrMg-HAP insert were similar to the literature data on bonding ability with human dentin, indicating that binary doped Sr,Mg-HAP ceramics present a promising material for application in restorative dentistry as dentin substitutes.
T2  - Ceramics International
T1  - Sr,Mg co-doping of calcium hydroxyapatite: Hydrothermal synthesis, processing, characterization and possible application as dentin substitutes
EP  - 11165
IS  - 8
SP  - 11155
VL  - 48
DO  - 10.1016/j.ceramint.2021.12.335
ER  - 

@article{
author = "Matić, Tamara and Zebić, M. Ležaja and Miletić, Vesna and Cvijović-Alagić, Ivana and Petrović, Rada and Janaćković, Đorđe and Veljović, Đorđe",
year = "2022",
abstract = "The aim of this study was to investigate the influence of binary Sr, Mg ion-doping compared to the single-ion doping effects on the phase composition and morphology of hydrothermally obtained calcium hydroxyapatite (HAP) powders and on the phase composition, microstructure, and mechanical properties of the sintered materials. Additionally, the focus of this study was to investigate the possible utilization of the binary doped Sr,Mg-HAP compacts as dentin substitutes in restorative dentistry by evaluating their bonding ability with commercially available restorative materials using the shear bond strength test (SBS). The hydrothermally obtained mono-doped Mg5 and Sr5 showed the monophasic apatite structure, while in all co-doped samples β-TCP phase was formed, resulting in biphasic calcium phosphate (BCP) powders. It was confirmed that co-doping with Sr and Mg ions led to the thermal stabilization of the β-TCP phase by suppressing the phase transition into α-TCP when sintered at 1200 °C. Moreover, the co-presence of Mg ions significantly improved the hardness of Sr-doped HAP from 3.74 to 5.02 GPa. Sr,Mg-HAP dental inserts were found to achieve sufficient bonding (13.53 MPa) through the micromechanical interlocking with Z250 dental composite and Single Bond Universal dental adhesive applied with a total etch approach. The SBS values obtained for the SrMg-HAP insert were similar to the literature data on bonding ability with human dentin, indicating that binary doped Sr,Mg-HAP ceramics present a promising material for application in restorative dentistry as dentin substitutes.",
journal = "Ceramics International",
title = "Sr,Mg co-doping of calcium hydroxyapatite: Hydrothermal synthesis, processing, characterization and possible application as dentin substitutes",
pages = "11165-11155",
number = "8",
volume = "48",
doi = "10.1016/j.ceramint.2021.12.335"
}

Matić, T., Zebić, M. L., Miletić, V., Cvijović-Alagić, I., Petrović, R., Janaćković, Đ.,& Veljović, Đ.. (2022). Sr,Mg co-doping of calcium hydroxyapatite: Hydrothermal synthesis, processing, characterization and possible application as dentin substitutes. in Ceramics International, 48(8), 11155-11165.
https://doi.org/10.1016/j.ceramint.2021.12.335

Matić T, Zebić ML, Miletić V, Cvijović-Alagić I, Petrović R, Janaćković Đ, Veljović Đ. Sr,Mg co-doping of calcium hydroxyapatite: Hydrothermal synthesis, processing, characterization and possible application as dentin substitutes. in Ceramics International. 2022;48(8):11155-11165.
doi:10.1016/j.ceramint.2021.12.335 .

Matić, Tamara, Zebić, M. Ležaja, Miletić, Vesna, Cvijović-Alagić, Ivana, Petrović, Rada, Janaćković, Đorđe, Veljović, Đorđe, "Sr,Mg co-doping of calcium hydroxyapatite: Hydrothermal synthesis, processing, characterization and possible application as dentin substitutes" in Ceramics International, 48, no. 8 (2022):11155-11165,
https://doi.org/10.1016/j.ceramint.2021.12.335 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Laketic, S.
AU  - Bajat, Jelena
AU  - Hohenwarter, A.
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4774
AB  - In this study, the influence of microstructural refinement induced by the high-pressure torsion (HPT) on the corrosion resistance of the Ti-45Nb (mass%) alloy was investigated. The alloy characteristics before and after the HPT deformation were analyzed by electron backscatter diffraction (EBSD), scanning transmission electron microscopy (STEM), x-ray diffraction (XRD), and Vickers microhardness measurements, while the alloy corrosion behavior in simulated physiological conditions was examined by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) analysis. Detailed microstructural analyses revealed that the HPT deformation led to significant grain refinement of the Ti-45Nb alloy exhibiting an ultra-fine grained (UFG) microstructure along with a substantial increase of hardness. Results also indicated that the grain refinement did not affect the alloy phase composition since beta-Ti and Ti4Nb phases were present in the microstructure before and after the HPT deformation. Even though the Ti-45Nb alloy in both, coarse-grained (CG) and UFG, conditions shows high corrosion resistance in Ringer's solution at 37 degrees C, it was observed that the HPT treatment additionally improved the alloy corrosion properties. Namely, more rapid formation of the passivating layer with better barrier properties on the UFG alloy surface was recorded and resulted in better corrosion resistance of the alloy after HPT deformation. An increase of the grain contact area in the refined microstructure caused an increase of the diffusive transfer along the grain boundaries, accelerated the formation of a less defective protective barrier surface layer, and promoted the alloy surface passivation in the simulated physiological conditions.
T2  - Surface & Coatings Technology
T1  - Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution
VL  - 423
DO  - 10.1016/j.surfcoat.2021.127609
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Laketic, S. and Bajat, Jelena and Hohenwarter, A. and Rakin, Marko",
year = "2021",
abstract = "In this study, the influence of microstructural refinement induced by the high-pressure torsion (HPT) on the corrosion resistance of the Ti-45Nb (mass%) alloy was investigated. The alloy characteristics before and after the HPT deformation were analyzed by electron backscatter diffraction (EBSD), scanning transmission electron microscopy (STEM), x-ray diffraction (XRD), and Vickers microhardness measurements, while the alloy corrosion behavior in simulated physiological conditions was examined by potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) analysis. Detailed microstructural analyses revealed that the HPT deformation led to significant grain refinement of the Ti-45Nb alloy exhibiting an ultra-fine grained (UFG) microstructure along with a substantial increase of hardness. Results also indicated that the grain refinement did not affect the alloy phase composition since beta-Ti and Ti4Nb phases were present in the microstructure before and after the HPT deformation. Even though the Ti-45Nb alloy in both, coarse-grained (CG) and UFG, conditions shows high corrosion resistance in Ringer's solution at 37 degrees C, it was observed that the HPT treatment additionally improved the alloy corrosion properties. Namely, more rapid formation of the passivating layer with better barrier properties on the UFG alloy surface was recorded and resulted in better corrosion resistance of the alloy after HPT deformation. An increase of the grain contact area in the refined microstructure caused an increase of the diffusive transfer along the grain boundaries, accelerated the formation of a less defective protective barrier surface layer, and promoted the alloy surface passivation in the simulated physiological conditions.",
journal = "Surface & Coatings Technology",
title = "Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution",
volume = "423",
doi = "10.1016/j.surfcoat.2021.127609"
}

Cvijović-Alagić, I., Laketic, S., Bajat, J., Hohenwarter, A.,& Rakin, M.. (2021). Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution. in Surface & Coatings Technology, 423.
https://doi.org/10.1016/j.surfcoat.2021.127609

Cvijović-Alagić I, Laketic S, Bajat J, Hohenwarter A, Rakin M. Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution. in Surface & Coatings Technology. 2021;423.
doi:10.1016/j.surfcoat.2021.127609 .

Cvijović-Alagić, Ivana, Laketic, S., Bajat, Jelena, Hohenwarter, A., Rakin, Marko, "Grain refinement effect on the Ti-45Nb alloy electrochemical behavior in simulated physiological solution" in Surface & Coatings Technology, 423 (2021),
https://doi.org/10.1016/j.surfcoat.2021.127609 . .

TY  - JOUR
AU  - Laketic, S.
AU  - Rakin, Marko
AU  - Momcilovic, M.
AU  - Ciganovic, J.
AU  - Veljović, Đorđe
AU  - Cvijović-Alagić, Ivana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4918
AB  - In the present study surface alterations of the high pressure torsion (HPT)-deformed Ti-45Nb (mass%) alloy induced by laser irradiation treatment are presented. The alloy was irradiated in air, argon, and nitrogen atmosphere using the Nd:YAG laser. Laser-induced surface modifications were analyzed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), profilometric analysis, and Vickers microhardness measurements. Alloy irradiation under a low laser output energy and a low number of accumulated pulses resulted in the formation of shallow surface craters. An increase of these irradiation parameters caused the appearance of more pronounced surface craters with microcracks and hydrodynamic effects in the form of wave-like structures, ripples, and solidified droplets and consequently caused an increase in the surface roughness. The highest value of the surface roughness of 3.062 Im was attained during the alloy irradiation in argon atmosphere under 15 mJ with 150 accumulated pulses. Interaction of the laser beam with the alloy surface was accompanied by plasma formation and surface ablation due to the irradiation energy absorption. The maximal ablated target material volumes of 5.5 x 10(14) nm(3) and 2.6 x 10(14) nm(3) were observed after the irradiation under 15 mJ with 150 accumulated pulses in argon and air atmosphere, respectively. Moreover, attainment of high temperatures at the alloy surface induced its chemical composition alterations. Formation of mixed Ti- and Nb-oxide surface film and absence of nitride particles at the alloy surface was detected irrespective of the irradiation atmosphere. Irradiation in air resulted in the appearance of the most pronounced surface oxide layer with the highest microhardness value which can in great merit influence an increase of the alloy bio-integration abilities and its tribo-corrosion resistance.
T2  - Surface & Coatings Technology
T1  - Influence of laser irradiation parameters on the ultrafine-grained Ti-45Nb alloy surface characteristics
VL  - 418
DO  - 10.1016/j.surfcoat.2021.127255
ER  - 

@article{
author = "Laketic, S. and Rakin, Marko and Momcilovic, M. and Ciganovic, J. and Veljović, Đorđe and Cvijović-Alagić, Ivana",
year = "2021",
abstract = "In the present study surface alterations of the high pressure torsion (HPT)-deformed Ti-45Nb (mass%) alloy induced by laser irradiation treatment are presented. The alloy was irradiated in air, argon, and nitrogen atmosphere using the Nd:YAG laser. Laser-induced surface modifications were analyzed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), profilometric analysis, and Vickers microhardness measurements. Alloy irradiation under a low laser output energy and a low number of accumulated pulses resulted in the formation of shallow surface craters. An increase of these irradiation parameters caused the appearance of more pronounced surface craters with microcracks and hydrodynamic effects in the form of wave-like structures, ripples, and solidified droplets and consequently caused an increase in the surface roughness. The highest value of the surface roughness of 3.062 Im was attained during the alloy irradiation in argon atmosphere under 15 mJ with 150 accumulated pulses. Interaction of the laser beam with the alloy surface was accompanied by plasma formation and surface ablation due to the irradiation energy absorption. The maximal ablated target material volumes of 5.5 x 10(14) nm(3) and 2.6 x 10(14) nm(3) were observed after the irradiation under 15 mJ with 150 accumulated pulses in argon and air atmosphere, respectively. Moreover, attainment of high temperatures at the alloy surface induced its chemical composition alterations. Formation of mixed Ti- and Nb-oxide surface film and absence of nitride particles at the alloy surface was detected irrespective of the irradiation atmosphere. Irradiation in air resulted in the appearance of the most pronounced surface oxide layer with the highest microhardness value which can in great merit influence an increase of the alloy bio-integration abilities and its tribo-corrosion resistance.",
journal = "Surface & Coatings Technology",
title = "Influence of laser irradiation parameters on the ultrafine-grained Ti-45Nb alloy surface characteristics",
volume = "418",
doi = "10.1016/j.surfcoat.2021.127255"
}

Laketic, S., Rakin, M., Momcilovic, M., Ciganovic, J., Veljović, Đ.,& Cvijović-Alagić, I.. (2021). Influence of laser irradiation parameters on the ultrafine-grained Ti-45Nb alloy surface characteristics. in Surface & Coatings Technology, 418.
https://doi.org/10.1016/j.surfcoat.2021.127255

Laketic S, Rakin M, Momcilovic M, Ciganovic J, Veljović Đ, Cvijović-Alagić I. Influence of laser irradiation parameters on the ultrafine-grained Ti-45Nb alloy surface characteristics. in Surface & Coatings Technology. 2021;418.
doi:10.1016/j.surfcoat.2021.127255 .

Laketic, S., Rakin, Marko, Momcilovic, M., Ciganovic, J., Veljović, Đorđe, Cvijović-Alagić, Ivana, "Influence of laser irradiation parameters on the ultrafine-grained Ti-45Nb alloy surface characteristics" in Surface & Coatings Technology, 418 (2021),
https://doi.org/10.1016/j.surfcoat.2021.127255 . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Stefane, Primoz
AU  - Gubeljak, Nenad
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/11
AB  - Severe plastic deformation (SPD) is a popular group of techniques applied to achieve the nanostructuring of the metallic biomaterials and improvement of their mechanical characteristics. One of the most commonly used SPD methods is the high-pressure torsion (HPT) technique which enables the obtainment of the microstructure with small grains and high strength. In the present study, the influence of the plastic deformation and surface modification treatment on the tensile and corrosion properties of the Ti-13Nb-13Zr (wt%) alloy is investigated. In that purpose, the coarse-grained (CG) Ti-13Nb-13Zr (TNZ) alloy was subjected to the HPT processing by applying a pressure of 4.1 GPa with a rotational speed of 0.2 rpm and 5 revolutions at room temperature to obtain the ultrafine-grained (UFG) microstructure. The alloy microstructure before and after HPT processing was analysed using the scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The homogeneity of the UFG TNZ alloy was determined by microhardness testing and microscopic observations. The nanotubular oxide layer on the surface of the TNZ alloy, both in CG and UFG condition, was formed by electrochemical anodization in 1 M H3PO4 + NaF electrolyte for 90 min. SEM analysis was used to characterise the morphology of the anodized surfaces, while energy dispersive spectroscopy was applied to determine the chemical composition of the nanostructured layers formed at the alloy surfaces. Mechanical properties of the TNZ alloy, before and after HPT processing and electrochemical anodization, were determined by tensile testing. After tensile testing, the fractographic analysis was conducted to identify the fracture mechanisms. The potentiodynamic polarization technique was used to determine the corrosion resistance of the alloy before and after plastic deformation and surface modification treatment. The obtained results showed that the alloy is reasonably homogeneous after the HPT processing. The XRD analyses reviled the presence of alpha ' and beta phases in the CG TNZ alloy microstructure, while the additional omega phase was detected in the microstructure of the UFG TNZ alloy. The HPT obtained alloy exhibits higher hardness and improved tensile properties than the alloy in the as-received CG condition, while the electrochemical anodization leads to a decrease of its mechanical properties. Both CG and UFG alloys show excellent corrosion stability in Ringer's solution. Moreover, electrochemical anodization leads to a decrease or an increase of the corrosion resistance of these materials, depending on the morphology of the formed nanotubular surface layers. The results indicate that the anodized CG TNZ alloy is characterized by a lower modulus of elasticity and better corrosion resistance properties than the anodized UFG TNZ alloy.
PB  - Korean Inst Metals Materials, Seoul
T2  - Metals and Materials International
T1  - Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion
EP  - 3341
IS  - 9
SP  - 3325
VL  - 27
DO  - 10.1007/s12540-020-00837-z
ER  - 

@article{
author = "Barjaktarević, Dragana and Međo, Bojan and Stefane, Primoz and Gubeljak, Nenad and Cvijović-Alagić, Ivana and Đokić, Veljko and Rakin, Marko",
year = "2021",
abstract = "Severe plastic deformation (SPD) is a popular group of techniques applied to achieve the nanostructuring of the metallic biomaterials and improvement of their mechanical characteristics. One of the most commonly used SPD methods is the high-pressure torsion (HPT) technique which enables the obtainment of the microstructure with small grains and high strength. In the present study, the influence of the plastic deformation and surface modification treatment on the tensile and corrosion properties of the Ti-13Nb-13Zr (wt%) alloy is investigated. In that purpose, the coarse-grained (CG) Ti-13Nb-13Zr (TNZ) alloy was subjected to the HPT processing by applying a pressure of 4.1 GPa with a rotational speed of 0.2 rpm and 5 revolutions at room temperature to obtain the ultrafine-grained (UFG) microstructure. The alloy microstructure before and after HPT processing was analysed using the scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The homogeneity of the UFG TNZ alloy was determined by microhardness testing and microscopic observations. The nanotubular oxide layer on the surface of the TNZ alloy, both in CG and UFG condition, was formed by electrochemical anodization in 1 M H3PO4 + NaF electrolyte for 90 min. SEM analysis was used to characterise the morphology of the anodized surfaces, while energy dispersive spectroscopy was applied to determine the chemical composition of the nanostructured layers formed at the alloy surfaces. Mechanical properties of the TNZ alloy, before and after HPT processing and electrochemical anodization, were determined by tensile testing. After tensile testing, the fractographic analysis was conducted to identify the fracture mechanisms. The potentiodynamic polarization technique was used to determine the corrosion resistance of the alloy before and after plastic deformation and surface modification treatment. The obtained results showed that the alloy is reasonably homogeneous after the HPT processing. The XRD analyses reviled the presence of alpha ' and beta phases in the CG TNZ alloy microstructure, while the additional omega phase was detected in the microstructure of the UFG TNZ alloy. The HPT obtained alloy exhibits higher hardness and improved tensile properties than the alloy in the as-received CG condition, while the electrochemical anodization leads to a decrease of its mechanical properties. Both CG and UFG alloys show excellent corrosion stability in Ringer's solution. Moreover, electrochemical anodization leads to a decrease or an increase of the corrosion resistance of these materials, depending on the morphology of the formed nanotubular surface layers. The results indicate that the anodized CG TNZ alloy is characterized by a lower modulus of elasticity and better corrosion resistance properties than the anodized UFG TNZ alloy.",
publisher = "Korean Inst Metals Materials, Seoul",
journal = "Metals and Materials International",
title = "Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion",
pages = "3341-3325",
number = "9",
volume = "27",
doi = "10.1007/s12540-020-00837-z"
}

Barjaktarević, D., Međo, B., Stefane, P., Gubeljak, N., Cvijović-Alagić, I., Đokić, V.,& Rakin, M.. (2021). Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion. in Metals and Materials International
Korean Inst Metals Materials, Seoul., 27(9), 3325-3341.
https://doi.org/10.1007/s12540-020-00837-z

Barjaktarević D, Međo B, Stefane P, Gubeljak N, Cvijović-Alagić I, Đokić V, Rakin M. Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion. in Metals and Materials International. 2021;27(9):3325-3341.
doi:10.1007/s12540-020-00837-z .

Barjaktarević, Dragana, Međo, Bojan, Stefane, Primoz, Gubeljak, Nenad, Cvijović-Alagić, Ivana, Đokić, Veljko, Rakin, Marko, "Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion" in Metals and Materials International, 27, no. 9 (2021):3325-3341,
https://doi.org/10.1007/s12540-020-00837-z . .

TY  - JOUR
AU  - Laketić, Slađana
AU  - Rakin, Marko
AU  - Momčilović, Miloš
AU  - Ciganović, Jovan
AU  - Veljović, Đorđe
AU  - Cvijović-Alagić, Ivana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/16
AB  - The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.
PB  - Springer, New York
T2  - International Journal of Minerals Metallurgy and Materials
T1  - Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser
DO  - 10.1007/s12613-020-2061-9
ER  - 

@article{
author = "Laketić, Slađana and Rakin, Marko and Momčilović, Miloš and Ciganović, Jovan and Veljović, Đorđe and Cvijović-Alagić, Ivana",
year = "2021",
abstract = "The effects of picosecond Nd:YAG laser irradiation on chemical and morphological surface characteristics of the commercially pure titanium and Ti-13Nb-13Zr alloy in air and argon atmospheres were studied under different laser output energy values. During the interaction of laser irradiation with the investigated materials, a part of the energy was absorbed on the target surface, influencing surface modifications. Laser beam interaction with the target surface resulted in various morphological alterations, resulting in crater formation and the presence of microcracks and hydrodynamic structures. Moreover, different chemical changes were induced on the target materials' surfaces, resulting in the titanium oxide formation in the irradiation-affected area and consequently increasing the irradiation energy absorption. Given the high energy absorption at the site of interaction, the dimensions of the surface damaged area increased. Consequently, surface roughness increased. The appearance of surface oxides also led to the increased material hardness in the surface-modified area. Observed chemical and morphological changes were pronounced after laser irradiation of the Ti-13Nb-13Zr alloy surface.",
publisher = "Springer, New York",
journal = "International Journal of Minerals Metallurgy and Materials",
title = "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser",
doi = "10.1007/s12613-020-2061-9"
}

Laketić, S., Rakin, M., Momčilović, M., Ciganović, J., Veljović, Đ.,& Cvijović-Alagić, I.. (2021). Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials
Springer, New York..
https://doi.org/10.1007/s12613-020-2061-9

Laketić S, Rakin M, Momčilović M, Ciganović J, Veljović Đ, Cvijović-Alagić I. Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser. in International Journal of Minerals Metallurgy and Materials. 2021;.
doi:10.1007/s12613-020-2061-9 .

Laketić, Slađana, Rakin, Marko, Momčilović, Miloš, Ciganović, Jovan, Veljović, Đorđe, Cvijović-Alagić, Ivana, "Surface modifications of biometallic commercially pure Ti and Ti-13Nb-13Zr alloy by picosecond Nd:YAG laser" in International Journal of Minerals Metallurgy and Materials (2021),
https://doi.org/10.1007/s12613-020-2061-9 . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Cvijović-Alagić, Ivana
AU  - Stefane, Primoz
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4751
AB  - Due to their excellent mechanical properties and corrosion resistance, titanium-based materials are widely represented in aeronautics, chemical industry and medicine, where they are considered the best replacement for damaged hard tissues. In order to obtain optimal properties for medical applications, commercially pure titanium (cpTi) is often alloyed. The beta-type titanium alloys containing Nb, Zr, Ta, Mo, Sn have attracted considerable attention, due to their unique combinations of high strength, low modulus of elasticity, superior corrosion resistance and biocompatibility. Also, titanium-based materials can be processed by surface modifications, including the anodization, which belongs to the group of chemical nanostructured surface modifications. Analysis of microstructure of two-phase Ti-13Nb-13Zr (TNZ) alloy was done by Scanning Electron Microscopy (SEM). Characterisation of surface, obtained by anodization in the H3PO4 + NaF solution, during 90 minutes process, was performed by SEM. Micro Tensile Specimens (MTS) were cut from TNZ and anodized TNZ disks and were subjected to the tensile test using servo-hydraulic testing machine Instron 1255. Stereometric measurement of strain at the surface of the MTS during tension was done using the Aramis system. Results showed that anodization process led to a creation of heterogeneous layer of nanotubes. Anodized TNZ alloy had lower elastic modulus and tensile strength comparing to the initial alloy. In order to better understand tensile behaviour, numerical analysis of non-anodized alloy was done. The 3D numerical model of MTS, which simulated the tensile test, was made in Abaqus software package. Good correlation between experimental and numerical results was obtained.
C3  - Procedia Structural Integrity
T1  - Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process
EP  - 2194
SP  - 2187
VL  - 28
DO  - 10.1016/j.prostr.2020.11.047
ER  - 

@conference{
author = "Barjaktarević, Dragana and Međo, Bojan and Gubeljak, Nenad and Cvijović-Alagić, Ivana and Stefane, Primoz and Đokić, Veljko and Rakin, Marko",
year = "2020",
abstract = "Due to their excellent mechanical properties and corrosion resistance, titanium-based materials are widely represented in aeronautics, chemical industry and medicine, where they are considered the best replacement for damaged hard tissues. In order to obtain optimal properties for medical applications, commercially pure titanium (cpTi) is often alloyed. The beta-type titanium alloys containing Nb, Zr, Ta, Mo, Sn have attracted considerable attention, due to their unique combinations of high strength, low modulus of elasticity, superior corrosion resistance and biocompatibility. Also, titanium-based materials can be processed by surface modifications, including the anodization, which belongs to the group of chemical nanostructured surface modifications. Analysis of microstructure of two-phase Ti-13Nb-13Zr (TNZ) alloy was done by Scanning Electron Microscopy (SEM). Characterisation of surface, obtained by anodization in the H3PO4 + NaF solution, during 90 minutes process, was performed by SEM. Micro Tensile Specimens (MTS) were cut from TNZ and anodized TNZ disks and were subjected to the tensile test using servo-hydraulic testing machine Instron 1255. Stereometric measurement of strain at the surface of the MTS during tension was done using the Aramis system. Results showed that anodization process led to a creation of heterogeneous layer of nanotubes. Anodized TNZ alloy had lower elastic modulus and tensile strength comparing to the initial alloy. In order to better understand tensile behaviour, numerical analysis of non-anodized alloy was done. The 3D numerical model of MTS, which simulated the tensile test, was made in Abaqus software package. Good correlation between experimental and numerical results was obtained.",
journal = "Procedia Structural Integrity",
title = "Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process",
pages = "2194-2187",
volume = "28",
doi = "10.1016/j.prostr.2020.11.047"
}

Barjaktarević, D., Međo, B., Gubeljak, N., Cvijović-Alagić, I., Stefane, P., Đokić, V.,& Rakin, M.. (2020). Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process. in Procedia Structural Integrity, 28, 2187-2194.
https://doi.org/10.1016/j.prostr.2020.11.047

Barjaktarević D, Međo B, Gubeljak N, Cvijović-Alagić I, Stefane P, Đokić V, Rakin M. Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process. in Procedia Structural Integrity. 2020;28:2187-2194.
doi:10.1016/j.prostr.2020.11.047 .

Barjaktarević, Dragana, Međo, Bojan, Gubeljak, Nenad, Cvijović-Alagić, Ivana, Stefane, Primoz, Đokić, Veljko, Rakin, Marko, "Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process" in Procedia Structural Integrity, 28 (2020):2187-2194,
https://doi.org/10.1016/j.prostr.2020.11.047 . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Đokić, Veljko
AU  - Bajat, Jelena
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4056
AB  - On the surface of the ultrafine-grained Ti-13Nb-13Zr alloy and the coarse-grained Ti-13Nb-13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance.
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva
VL  - 103
DO  - 10.1016/j.tafmec.2019.102307
ER  - 

@article{
author = "Barjaktarević, Dragana and Đokić, Veljko and Bajat, Jelena and Dimić, Ivana and Cvijović-Alagić, Ivana and Rakin, Marko",
year = "2019",
abstract = "On the surface of the ultrafine-grained Ti-13Nb-13Zr alloy and the coarse-grained Ti-13Nb-13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance.",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva",
volume = "103",
doi = "10.1016/j.tafmec.2019.102307"
}

Barjaktarević, D., Đokić, V., Bajat, J., Dimić, I., Cvijović-Alagić, I.,& Rakin, M.. (2019). The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 103.
https://doi.org/10.1016/j.tafmec.2019.102307

Barjaktarević D, Đokić V, Bajat J, Dimić I, Cvijović-Alagić I, Rakin M. The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics. 2019;103.
doi:10.1016/j.tafmec.2019.102307 .

Barjaktarević, Dragana, Đokić, Veljko, Bajat, Jelena, Dimić, Ivana, Cvijović-Alagić, Ivana, Rakin, Marko, "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva" in Theoretical and Applied Fracture Mechanics, 103 (2019),
https://doi.org/10.1016/j.tafmec.2019.102307 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica M.
AU  - Zagorac, Dejan
AU  - Jovanović, Milan T.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5884
AB  - The microstructure variation and oxidation behavior of a hot-rolled and quenched Ti-24Al-11Nb (at%) intermetallic alloy with and without protective Ni-20Cr (at%) coating were studied in the air at a cyclic annealing temperature of 600 °C and 900 °C. The phase transformations monitored up to 120 h of alloy oxidation and oxidation products were examined using different experimental techniques. The oxidation kinetics was determined by recording the mass gain vs. time data and oxidation activation energy was evaluated. It was found that the annealing temperature and deposited coating significantly affect the scale formation and growth. The alloy showed better oxidation resistance at 600 °C, irrespective of the protective coating application. The higher temperature promoted the formation of thicker and multi-layered scale predominantly composed of Nb-doped TiO2 and Al2O3 oxides, which cracked and spalled causing oxidation rate for an order of magnitude higher than that at 600 °C. The presence of AlN decelerated the oxide scale growth, which obeyed a parabolic rate law. It was also noted that a two-phase α2+β microstructure changed to a greater extent. With increasing temperature, the α2→β phase transformation occurred more intensive and new α2′′ and O-Ti2AlNb phase appeared. The Ni-20Cr coating reduced the oxidation rate at both temperatures and improved the scale-spallation resistance. The compact Cr2O3 layer formed on the coated alloy led to the preferential Al2O3 formation, increasing its amount in mixture with Nb-enriched TiO2 oxide. Thin TiN layer detected beneath the oxide scale also supported the formation of slow-growing Al2O3, leading to a decrease in the oxidation rate. The external scale suppression contributed to the greater diffusion zone enrichment, resulting in the faster O-Ti2AlNb formation. The experimentally observed O-Ti2AlNb formation was confirmed by ab initio modeling. Furthermore, additional structures were predicted and studied using first-principles calculations in the O-Ti2AlNb compound. © 2018
T2  - Ceramics International
T1  - Cyclic oxidation of Ti3Al-based materials
EP  - 9438
IS  - 7
SP  - 9423
VL  - 45
DO  - 10.1016/j.ceramint.2018.08.287
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica M. and Zagorac, Dejan and Jovanović, Milan T.",
year = "2019",
abstract = "The microstructure variation and oxidation behavior of a hot-rolled and quenched Ti-24Al-11Nb (at%) intermetallic alloy with and without protective Ni-20Cr (at%) coating were studied in the air at a cyclic annealing temperature of 600 °C and 900 °C. The phase transformations monitored up to 120 h of alloy oxidation and oxidation products were examined using different experimental techniques. The oxidation kinetics was determined by recording the mass gain vs. time data and oxidation activation energy was evaluated. It was found that the annealing temperature and deposited coating significantly affect the scale formation and growth. The alloy showed better oxidation resistance at 600 °C, irrespective of the protective coating application. The higher temperature promoted the formation of thicker and multi-layered scale predominantly composed of Nb-doped TiO2 and Al2O3 oxides, which cracked and spalled causing oxidation rate for an order of magnitude higher than that at 600 °C. The presence of AlN decelerated the oxide scale growth, which obeyed a parabolic rate law. It was also noted that a two-phase α2+β microstructure changed to a greater extent. With increasing temperature, the α2→β phase transformation occurred more intensive and new α2′′ and O-Ti2AlNb phase appeared. The Ni-20Cr coating reduced the oxidation rate at both temperatures and improved the scale-spallation resistance. The compact Cr2O3 layer formed on the coated alloy led to the preferential Al2O3 formation, increasing its amount in mixture with Nb-enriched TiO2 oxide. Thin TiN layer detected beneath the oxide scale also supported the formation of slow-growing Al2O3, leading to a decrease in the oxidation rate. The external scale suppression contributed to the greater diffusion zone enrichment, resulting in the faster O-Ti2AlNb formation. The experimentally observed O-Ti2AlNb formation was confirmed by ab initio modeling. Furthermore, additional structures were predicted and studied using first-principles calculations in the O-Ti2AlNb compound. © 2018",
journal = "Ceramics International",
title = "Cyclic oxidation of Ti3Al-based materials",
pages = "9438-9423",
number = "7",
volume = "45",
doi = "10.1016/j.ceramint.2018.08.287"
}

Cvijović-Alagić, I., Cvijović, Z. M., Zagorac, D.,& Jovanović, M. T.. (2019). Cyclic oxidation of Ti3Al-based materials. in Ceramics International, 45(7), 9423-9438.
https://doi.org/10.1016/j.ceramint.2018.08.287

Cvijović-Alagić I, Cvijović ZM, Zagorac D, Jovanović MT. Cyclic oxidation of Ti3Al-based materials. in Ceramics International. 2019;45(7):9423-9438.
doi:10.1016/j.ceramint.2018.08.287 .

Cvijović-Alagić, Ivana, Cvijović, Zorica M., Zagorac, Dejan, Jovanović, Milan T., "Cyclic oxidation of Ti3Al-based materials" in Ceramics International, 45, no. 7 (2019):9423-9438,
https://doi.org/10.1016/j.ceramint.2018.08.287 . .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4049
AB  - Wear damage behavior of new orthopedic Ti-13Nb-13Zr (mass %) alloy with martensitic microstructures developed by different thermo-mechanical treatments were examined during sliding in simulated physiological solution. The results obtained for this alloy processed by cold and hot rolling were compared with that of the standard Ti-6Al-4 V (mass %) alloy heat-treated to produce martensitic microstructure. The block-on-disk sliding friction and wear tests were conducted in Ringer's solution. The friction coefficient, wear rate, and wear damage mechanisms were determined over a range of normal loads (20-60 N) and linear sliding speeds (0.26-1.0 m/s). The surface damage morphology revealed the presence of corrosive, abrasive, and adhesive wear in all investigated materials. The friction and wear properties were found to be dependent on the predominant wear damage mechanism and applied load/sliding speed combination. In the case of a Ti-13Nb-13Zr alloy, the adhesive wear contributes to the higher wear rate and better friction behavior. This cold-rolled alloy, having a martensitic microstructure with the lowest hardness, shows the lowest friction coefficient values due to high material transfer from the alloy surface. The lowest friction resistance is observed for the Ti-6Al-4 V alloy with the highest hardness since the dominant wear damage mechanism is abrasion resulting in the low wear rate and material transfer.
PB  - Sage Publications Ltd, London
T2  - International Journal of Damage Mechanics
T1  - Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution
EP  - 1247
IS  - 8
SP  - 1228
VL  - 28
DO  - 10.1177/1056789518823049
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica and Rakin, Marko",
year = "2019",
abstract = "Wear damage behavior of new orthopedic Ti-13Nb-13Zr (mass %) alloy with martensitic microstructures developed by different thermo-mechanical treatments were examined during sliding in simulated physiological solution. The results obtained for this alloy processed by cold and hot rolling were compared with that of the standard Ti-6Al-4 V (mass %) alloy heat-treated to produce martensitic microstructure. The block-on-disk sliding friction and wear tests were conducted in Ringer's solution. The friction coefficient, wear rate, and wear damage mechanisms were determined over a range of normal loads (20-60 N) and linear sliding speeds (0.26-1.0 m/s). The surface damage morphology revealed the presence of corrosive, abrasive, and adhesive wear in all investigated materials. The friction and wear properties were found to be dependent on the predominant wear damage mechanism and applied load/sliding speed combination. In the case of a Ti-13Nb-13Zr alloy, the adhesive wear contributes to the higher wear rate and better friction behavior. This cold-rolled alloy, having a martensitic microstructure with the lowest hardness, shows the lowest friction coefficient values due to high material transfer from the alloy surface. The lowest friction resistance is observed for the Ti-6Al-4 V alloy with the highest hardness since the dominant wear damage mechanism is abrasion resulting in the low wear rate and material transfer.",
publisher = "Sage Publications Ltd, London",
journal = "International Journal of Damage Mechanics",
title = "Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution",
pages = "1247-1228",
number = "8",
volume = "28",
doi = "10.1177/1056789518823049"
}

Cvijović-Alagić, I., Cvijović, Z.,& Rakin, M.. (2019). Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution. in International Journal of Damage Mechanics
Sage Publications Ltd, London., 28(8), 1228-1247.
https://doi.org/10.1177/1056789518823049

Cvijović-Alagić I, Cvijović Z, Rakin M. Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution. in International Journal of Damage Mechanics. 2019;28(8):1228-1247.
doi:10.1177/1056789518823049 .

Cvijović-Alagić, Ivana, Cvijović, Zorica, Rakin, Marko, "Damage behavior of orthopedic titanium alloys with martensitic microstructure during sliding wear in physiological solution" in International Journal of Damage Mechanics, 28, no. 8 (2019):1228-1247,
https://doi.org/10.1177/1056789518823049 . .

TY  - JOUR
AU  - Laketić, Slađana
AU  - Rakin, Marko
AU  - Čairović, Aleksandra
AU  - Maksimović, Vesna
AU  - Cvijović-Alagić, Ivana
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4287
AB  - Metallic biomaterials are most commonly used as hard-tissue replacements because of their favorable mechanical features and excellent biocompatibility. The objective of this paper is to present an overview of diverse surface modification techniques, with a special emphasis on the laser surface modification method, as well as diverse characterization techniques used for investigating the impact of the surface modification process on metallic implant materials' properties. Moreover, the effect of laser radiation on the surface its and mechanical characteristics, as well as on the structure of metallic bioimplants, is presented. The study of influence of high-intensity laser radiation on metallic materials' surface includes primarily investigations of the surface morphology modifications and specific surface structure formation since their presence enables enhanced osseointegration.
AB  - Metalni biomaterijali se najčešće koriste za izradu implantanata čvrstih strukturnih delova ljudskog tela zbog svojih dobrih mehaničkih karakteristika i odlične biokompatibilnosti. Cilj rada je da se pregledno predstave različite tehnike površinske modifikacije implantantnih materijala sa posebnim osvrtom na metodu laserske modifikacije površine, kao i mnogobrojne karakterizacione metode za ispitivanje uticaja procesa površinske modifikacije na svojstva metalnih implantantnih materijala. Osim toga, predstavljen je i razmatran uticaj laserskog zračenja na površinske i mehaničke karakteristike, kao i na strukturu metalnih bioimplantanata. Ispitivanje uticaja laserskog zračenja visokog intenziteta na površinu metalnih materijala prvenstveno obuhvata ispitivanje morfoloških površinskih promena i formiranja specifičnih površinskih struktura, koje doprinose poboljšanju oseointegracije metalnih implantanata.
PB  - Serbian Medical Society
T2  - Srpski arhiv za celokupno lekarstvo
T1  - Laser surface modification of metallic implant materials
T1  - Laserska površinska modifikacija metalnih implantantnih materijala
EP  - 501
IS  - 7-8
SP  - 497
VL  - 147
DO  - 10.2298/SARH181126054L
ER  - 

@article{
author = "Laketić, Slađana and Rakin, Marko and Čairović, Aleksandra and Maksimović, Vesna and Cvijović-Alagić, Ivana",
year = "2019",
abstract = "Metallic biomaterials are most commonly used as hard-tissue replacements because of their favorable mechanical features and excellent biocompatibility. The objective of this paper is to present an overview of diverse surface modification techniques, with a special emphasis on the laser surface modification method, as well as diverse characterization techniques used for investigating the impact of the surface modification process on metallic implant materials' properties. Moreover, the effect of laser radiation on the surface its and mechanical characteristics, as well as on the structure of metallic bioimplants, is presented. The study of influence of high-intensity laser radiation on metallic materials' surface includes primarily investigations of the surface morphology modifications and specific surface structure formation since their presence enables enhanced osseointegration., Metalni biomaterijali se najčešće koriste za izradu implantanata čvrstih strukturnih delova ljudskog tela zbog svojih dobrih mehaničkih karakteristika i odlične biokompatibilnosti. Cilj rada je da se pregledno predstave različite tehnike površinske modifikacije implantantnih materijala sa posebnim osvrtom na metodu laserske modifikacije površine, kao i mnogobrojne karakterizacione metode za ispitivanje uticaja procesa površinske modifikacije na svojstva metalnih implantantnih materijala. Osim toga, predstavljen je i razmatran uticaj laserskog zračenja na površinske i mehaničke karakteristike, kao i na strukturu metalnih bioimplantanata. Ispitivanje uticaja laserskog zračenja visokog intenziteta na površinu metalnih materijala prvenstveno obuhvata ispitivanje morfoloških površinskih promena i formiranja specifičnih površinskih struktura, koje doprinose poboljšanju oseointegracije metalnih implantanata.",
publisher = "Serbian Medical Society",
journal = "Srpski arhiv za celokupno lekarstvo",
title = "Laser surface modification of metallic implant materials, Laserska površinska modifikacija metalnih implantantnih materijala",
pages = "501-497",
number = "7-8",
volume = "147",
doi = "10.2298/SARH181126054L"
}

Laketić, S., Rakin, M., Čairović, A., Maksimović, V.,& Cvijović-Alagić, I.. (2019). Laser surface modification of metallic implant materials. in Srpski arhiv za celokupno lekarstvo
Serbian Medical Society., 147(7-8), 497-501.
https://doi.org/10.2298/SARH181126054L

Laketić S, Rakin M, Čairović A, Maksimović V, Cvijović-Alagić I. Laser surface modification of metallic implant materials. in Srpski arhiv za celokupno lekarstvo. 2019;147(7-8):497-501.
doi:10.2298/SARH181126054L .

Laketić, Slađana, Rakin, Marko, Čairović, Aleksandra, Maksimović, Vesna, Cvijović-Alagić, Ivana, "Laser surface modification of metallic implant materials" in Srpski arhiv za celokupno lekarstvo, 147, no. 7-8 (2019):497-501,
https://doi.org/10.2298/SARH181126054L . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Hohenwarter, Anton
AU  - Pippan, Reinhard
AU  - Kojić, Vesna
AU  - Bajat, Jelena
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3963
AB  - The purpose of this study was to estimate the electrochemical behavior and biocompatibility of ultrafine-grained (UFG) commercially pure titanium (CPTi) and Ti-13Nb-13Zr (TNZ) alloy obtained by high-pressure torsion process. Electrochemical behavior of materials in artificial saliva at 37 degrees C was evaluated by potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS), and the obtained results indicated that UFG TNZ alloy showed corrosion current density (j(corr)=53 +/- 5 nA cm(-2)) which was 2 times lower compared to coarse-grained (CG) TNZ alloy (j(corr)=110 +/- 12 nA cm(-2)) and higher corrosion resistance, while UFG CPTi and CPTi showed approximately the same corrosion rate (mean j(corr) approximate to 38-40 nA cm(-2)). Static immersion test in artificial saliva, performed in this study, showed that the released ion concentrations from UFG materials were more than 10 times lower than the permitted concentration (the highest released Ti ion concentration from UFG CPTi and UFG TNZ alloy was 1.12 and 1.28 ppb, respectively, while permitted concentration was 15.5 ppb). The in vitro cytotoxicity tests, as the initial phase of the biocompatibility evaluation, showed that the fraction of surviving cells in all examined materials was much higher compared to the control sample and hence demonstrated absence of cytotoxicity and an increase of fibroblast cells adhesion on UFG materials surfaces. UFG CPTi and UFG TNZ alloy can be considered as promising materials for applications in dentistry due to high corrosion resistance and outstanding biocompatibility which were shown in this study.
PB  - Wiley, Hoboken
T2  - Journal of Biomedical Materials Research Part B-Applied Biomaterials
T1  - Electrochemical and biocompatibility examinations of high-pressure torsion processed titanium and Ti-13Nb-13Zr alloy
EP  - 1107
IS  - 3
SP  - 1097
VL  - 106
DO  - 10.1002/jbm.b.33919
ER  - 

@article{
author = "Dimić, Ivana and Cvijović-Alagić, Ivana and Hohenwarter, Anton and Pippan, Reinhard and Kojić, Vesna and Bajat, Jelena and Rakin, Marko",
year = "2018",
abstract = "The purpose of this study was to estimate the electrochemical behavior and biocompatibility of ultrafine-grained (UFG) commercially pure titanium (CPTi) and Ti-13Nb-13Zr (TNZ) alloy obtained by high-pressure torsion process. Electrochemical behavior of materials in artificial saliva at 37 degrees C was evaluated by potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS), and the obtained results indicated that UFG TNZ alloy showed corrosion current density (j(corr)=53 +/- 5 nA cm(-2)) which was 2 times lower compared to coarse-grained (CG) TNZ alloy (j(corr)=110 +/- 12 nA cm(-2)) and higher corrosion resistance, while UFG CPTi and CPTi showed approximately the same corrosion rate (mean j(corr) approximate to 38-40 nA cm(-2)). Static immersion test in artificial saliva, performed in this study, showed that the released ion concentrations from UFG materials were more than 10 times lower than the permitted concentration (the highest released Ti ion concentration from UFG CPTi and UFG TNZ alloy was 1.12 and 1.28 ppb, respectively, while permitted concentration was 15.5 ppb). The in vitro cytotoxicity tests, as the initial phase of the biocompatibility evaluation, showed that the fraction of surviving cells in all examined materials was much higher compared to the control sample and hence demonstrated absence of cytotoxicity and an increase of fibroblast cells adhesion on UFG materials surfaces. UFG CPTi and UFG TNZ alloy can be considered as promising materials for applications in dentistry due to high corrosion resistance and outstanding biocompatibility which were shown in this study.",
publisher = "Wiley, Hoboken",
journal = "Journal of Biomedical Materials Research Part B-Applied Biomaterials",
title = "Electrochemical and biocompatibility examinations of high-pressure torsion processed titanium and Ti-13Nb-13Zr alloy",
pages = "1107-1097",
number = "3",
volume = "106",
doi = "10.1002/jbm.b.33919"
}

Dimić, I., Cvijović-Alagić, I., Hohenwarter, A., Pippan, R., Kojić, V., Bajat, J.,& Rakin, M.. (2018). Electrochemical and biocompatibility examinations of high-pressure torsion processed titanium and Ti-13Nb-13Zr alloy. in Journal of Biomedical Materials Research Part B-Applied Biomaterials
Wiley, Hoboken., 106(3), 1097-1107.
https://doi.org/10.1002/jbm.b.33919

Dimić I, Cvijović-Alagić I, Hohenwarter A, Pippan R, Kojić V, Bajat J, Rakin M. Electrochemical and biocompatibility examinations of high-pressure torsion processed titanium and Ti-13Nb-13Zr alloy. in Journal of Biomedical Materials Research Part B-Applied Biomaterials. 2018;106(3):1097-1107.
doi:10.1002/jbm.b.33919 .

Dimić, Ivana, Cvijović-Alagić, Ivana, Hohenwarter, Anton, Pippan, Reinhard, Kojić, Vesna, Bajat, Jelena, Rakin, Marko, "Electrochemical and biocompatibility examinations of high-pressure torsion processed titanium and Ti-13Nb-13Zr alloy" in Journal of Biomedical Materials Research Part B-Applied Biomaterials, 106, no. 3 (2018):1097-1107,
https://doi.org/10.1002/jbm.b.33919 . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Bajat, Jelena
AU  - Cvijović-Alagić, Ivana
AU  - Dimić, Ivana
AU  - Hohenwarter, Anton
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3785
AB  - In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37 degrees C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity
T1  - The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
EP  - 1839
SP  - 1834
VL  - 13
DO  - 10.1016/j.prostr.2018.12.332
ER  - 

@conference{
author = "Barjaktarević, Dragana and Bajat, Jelena and Cvijović-Alagić, Ivana and Dimić, Ivana and Hohenwarter, Anton and Đokić, Veljko and Rakin, Marko",
year = "2018",
abstract = "In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37 degrees C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity",
title = "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
pages = "1839-1834",
volume = "13",
doi = "10.1016/j.prostr.2018.12.332"
}

Barjaktarević, D., Bajat, J., Cvijović-Alagić, I., Dimić, I., Hohenwarter, A., Đokić, V.,& Rakin, M.. (2018). The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity
Elsevier Science Bv, Amsterdam., 13, 1834-1839.
https://doi.org/10.1016/j.prostr.2018.12.332

Barjaktarević D, Bajat J, Cvijović-Alagić I, Dimić I, Hohenwarter A, Đokić V, Rakin M. The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity. 2018;13:1834-1839.
doi:10.1016/j.prostr.2018.12.332 .

Barjaktarević, Dragana, Bajat, Jelena, Cvijović-Alagić, Ivana, Dimić, Ivana, Hohenwarter, Anton, Đokić, Veljko, Rakin, Marko, "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Procedia Structural Integrity, 13 (2018):1834-1839,
https://doi.org/10.1016/j.prostr.2018.12.332 . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3801
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu
T1  - Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization
EP  - 162
SP  - 160
UR  - https://hdl.handle.net/21.15107/rcub_vinar_8736
ER  - 

@conference{
author = "Barjaktarević, Dragana and Dimić, Ivana and Cvijović-Alagić, Ivana and Đokić, Veljko and Rakin, Marko",
year = "2018",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu",
title = "Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization",
pages = "162-160",
url = "https://hdl.handle.net/21.15107/rcub_vinar_8736"
}

Barjaktarević, D., Dimić, I., Cvijović-Alagić, I., Đokić, V.,& Rakin, M.. (2018). Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu
Belgrade : Serbian Academy of Sciences and Arts., 160-162.
https://hdl.handle.net/21.15107/rcub_vinar_8736

Barjaktarević D, Dimić I, Cvijović-Alagić I, Đokić V, Rakin M. Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu. 2018;:160-162.
https://hdl.handle.net/21.15107/rcub_vinar_8736 .

Barjaktarević, Dragana, Dimić, Ivana, Cvijović-Alagić, Ivana, Đokić, Veljko, Rakin, Marko, "Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization" in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu (2018):160-162,
https://hdl.handle.net/21.15107/rcub_vinar_8736 .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica
AU  - Maletaškić, Jelena
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3929
AB  - effect of initial microstructure on the mechanical properties and fracture mode of the Ti-6Al-4V ELI alloy subjected to the high-pressure torsion (HPT) processing at room temperature and 500 degrees C was investigated. In this purpose, the four different microstructures (fully lamellar, martensitic, equiaxed and globular microstructures) were developed by the proper heat treatments. The results showed that the application of the HPT processing provided substantial microstructural refinement, independent on the alloy initial microstructure. As a consequence, the alloy hardness, tensile strength and ductility significantly increased. At the same time, the elastic modulus of the HPT-processed alloy is almost 2 times lower as compared to that of the alloy in the initial heat treated state. The obtained improvements strongly depend on the alloy initial microstructure and HPT processing temperature. It was found that the initial martensitic microstructure is beneficial to improve the hardness, tensile and fracture properties. The HPT processing at 500 degrees C enhanced them more effectively. After the warm HPT processing, alloy with the initial martensitic microstructure exhibited exceptional hardness (455 MPa), high ultimate tensile strength (1546 MPa), high elongation to failure (18.8%) and low elastic modulus (78.6 GPa). Although the alloy with initial fully lamellar microstructure displayed the lowest elastic modulus (68 GPa), the ultrafine and homogeneous (alpha + beta) two-phase microstructure produced by the HPT processing of the alloy with initial martensitic microstructure offered the best combination of the strength-ductility balance and strength-to-elastic modulus ratio (19.8 x 10(-3)). The complex fracture process, involving transgranular quasi-cleavage and ductile dimple fracture mode, corresponded to the changes in ductility.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
T1  - Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion
EP  - 192
SP  - 175
VL  - 736
DO  - 10.1016/j.msea.2018.08.094
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica and Maletaškić, Jelena and Rakin, Marko",
year = "2018",
abstract = "effect of initial microstructure on the mechanical properties and fracture mode of the Ti-6Al-4V ELI alloy subjected to the high-pressure torsion (HPT) processing at room temperature and 500 degrees C was investigated. In this purpose, the four different microstructures (fully lamellar, martensitic, equiaxed and globular microstructures) were developed by the proper heat treatments. The results showed that the application of the HPT processing provided substantial microstructural refinement, independent on the alloy initial microstructure. As a consequence, the alloy hardness, tensile strength and ductility significantly increased. At the same time, the elastic modulus of the HPT-processed alloy is almost 2 times lower as compared to that of the alloy in the initial heat treated state. The obtained improvements strongly depend on the alloy initial microstructure and HPT processing temperature. It was found that the initial martensitic microstructure is beneficial to improve the hardness, tensile and fracture properties. The HPT processing at 500 degrees C enhanced them more effectively. After the warm HPT processing, alloy with the initial martensitic microstructure exhibited exceptional hardness (455 MPa), high ultimate tensile strength (1546 MPa), high elongation to failure (18.8%) and low elastic modulus (78.6 GPa). Although the alloy with initial fully lamellar microstructure displayed the lowest elastic modulus (68 GPa), the ultrafine and homogeneous (alpha + beta) two-phase microstructure produced by the HPT processing of the alloy with initial martensitic microstructure offered the best combination of the strength-ductility balance and strength-to-elastic modulus ratio (19.8 x 10(-3)). The complex fracture process, involving transgranular quasi-cleavage and ductile dimple fracture mode, corresponded to the changes in ductility.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing",
title = "Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion",
pages = "192-175",
volume = "736",
doi = "10.1016/j.msea.2018.08.094"
}

Cvijović-Alagić, I., Cvijović, Z., Maletaškić, J.,& Rakin, M.. (2018). Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion. in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
Elsevier Science Sa, Lausanne., 736, 175-192.
https://doi.org/10.1016/j.msea.2018.08.094

Cvijović-Alagić I, Cvijović Z, Maletaškić J, Rakin M. Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion. in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing. 2018;736:175-192.
doi:10.1016/j.msea.2018.08.094 .

Cvijović-Alagić, Ivana, Cvijović, Zorica, Maletaškić, Jelena, Rakin, Marko, "Initial microstructure effect on the mechanical properties of Ti-6Al-4V ELI alloy processed by high-pressure torsion" in Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 736 (2018):175-192,
https://doi.org/10.1016/j.msea.2018.08.094 . .

TY  - JOUR
AU  - Matić, Tamara
AU  - Ležaja-Zebić, Maja
AU  - Cvijović-Alagić, Ivana
AU  - Miletić, Vesna
AU  - Petrović, Rada
AU  - Janaćković, Đorđe
AU  - Veljović, Đorđe
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3918
AB  - This study aimed to investigate the possibility of modifying model BisGMA/TEGDMA dental composite by substituting 10 wt. % of conventional glass fillers with bioactive fillers based on calcinated nanosized hydroxyapatite (HAp) and Mg-doped hydroxyapatite (Mg-HAp). HAp and Mg-HAp powders were synthesized hydrothermally. Mechanical properties: hardness by Vickers (HV) and flexural strength (Fs) were tested initially and after being stored for 28 days in simulated body fluid (SBF). The experimental composites with HAp and Mg-HAp particles showed no statistically significant difference in HV compared to the control (p gt 0.05) either initially or after storage. Although mean Fs values of modified composites tested initially were lower (62 MPa) than those of the control (72 MPa), after 28 days of storage in SBF Fs values were greater for modified composites (42 MPa control sample, 48 MPa HAp, and Mg-HAp samples). In vitro bioactivity of BisGMA/TEGDMA composites with HAp and Mg-HAp particles after 28 days in SBF was not detected.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metallurgical & Materials Engineering
T1  - The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging
EP  - 281
IS  - 4
SP  - 271
VL  - 24
DO  - 10.30544/403
ER  - 

@article{
author = "Matić, Tamara and Ležaja-Zebić, Maja and Cvijović-Alagić, Ivana and Miletić, Vesna and Petrović, Rada and Janaćković, Đorđe and Veljović, Đorđe",
year = "2018",
abstract = "This study aimed to investigate the possibility of modifying model BisGMA/TEGDMA dental composite by substituting 10 wt. % of conventional glass fillers with bioactive fillers based on calcinated nanosized hydroxyapatite (HAp) and Mg-doped hydroxyapatite (Mg-HAp). HAp and Mg-HAp powders were synthesized hydrothermally. Mechanical properties: hardness by Vickers (HV) and flexural strength (Fs) were tested initially and after being stored for 28 days in simulated body fluid (SBF). The experimental composites with HAp and Mg-HAp particles showed no statistically significant difference in HV compared to the control (p gt 0.05) either initially or after storage. Although mean Fs values of modified composites tested initially were lower (62 MPa) than those of the control (72 MPa), after 28 days of storage in SBF Fs values were greater for modified composites (42 MPa control sample, 48 MPa HAp, and Mg-HAp samples). In vitro bioactivity of BisGMA/TEGDMA composites with HAp and Mg-HAp particles after 28 days in SBF was not detected.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metallurgical & Materials Engineering",
title = "The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging",
pages = "281-271",
number = "4",
volume = "24",
doi = "10.30544/403"
}

Matić, T., Ležaja-Zebić, M., Cvijović-Alagić, I., Miletić, V., Petrović, R., Janaćković, Đ.,& Veljović, Đ.. (2018). The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging. in Metallurgical & Materials Engineering
Savez inženjera metalurgije Srbije, Beograd., 24(4), 271-281.
https://doi.org/10.30544/403

Matić T, Ležaja-Zebić M, Cvijović-Alagić I, Miletić V, Petrović R, Janaćković Đ, Veljović Đ. The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging. in Metallurgical & Materials Engineering. 2018;24(4):271-281.
doi:10.30544/403 .

Matić, Tamara, Ležaja-Zebić, Maja, Cvijović-Alagić, Ivana, Miletić, Vesna, Petrović, Rada, Janaćković, Đorđe, Veljović, Đorđe, "The effect of calcinated hydroxyapatite and magnesium doped hydroxyapatite as fillers on the mechanical properties of a model bisgma/tegdma dental composite initially and after aging" in Metallurgical & Materials Engineering, 24, no. 4 (2018):271-281,
https://doi.org/10.30544/403 . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko
AU  - Bajat, Jelena
AU  - Rakin, Marko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5254
AB  - The good corrosion resistance is crucial for implant biomaterials application, because the metallic ion release from the implant to the surrounding tissue may give rise to biocompatibility problems. In order to optimize and enhance the implant material properties, the implant surfaces can be modified by different chemical surface treatments, including electrochemical anodic oxidation. In the present study nanotubular oxide layer on the surface of ultrafine-grained titanium (UFG cpTi), Ti-13Nb-13Zr (UFG TNZ) alloy and coarse-grained Ti-13Nb-13Zr (CG TNZ) alloy was formed using electrochemical anodization in 1M H3PO4 + 0.5 wt % NaF electrolyte, at room temperature during 60 minutes for UFG cpTi and 90 minutes for investigated alloys. The nanotubes morphology was studied using scanning electron microscopy (SEM). The SEM images showed that anodization of titanium and its alloy in a fluoride-containing electrolyte can lead to the formation of a highly regular self-organized nanotubular layer. Furthermore, nanotubes formed on UFG TNZ alloy were more uniformly arranged compared to nanotubes on CG TNZ alloy surface. The aim of this study was to determine the electrochemical behavior of titanium and its alloy after electrochemical anodization. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37°C, in order to simulate the oral environment and examine the above-mentioned materials for dental application. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance. The newly-formed inner barrier and outer porous surface layers were found to be highly resistant with capacitive behavior, but the materials with nanotubular oxide layer on their surface showed improved corrosion resistance.
PB  - Materials Research Society of Srebia
C3  - Materials Research Society of Srebia
T1  - Corrosion behavior of nanotubular oxide layer formed on titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
SP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5254
ER  - 

@conference{
author = "Barjaktarević, Dragana and Dimić, Ivana and Cvijović-Alagić, Ivana and Đokić, Veljko and Bajat, Jelena and Rakin, Marko",
year = "2017",
abstract = "The good corrosion resistance is crucial for implant biomaterials application, because the metallic ion release from the implant to the surrounding tissue may give rise to biocompatibility problems. In order to optimize and enhance the implant material properties, the implant surfaces can be modified by different chemical surface treatments, including electrochemical anodic oxidation. In the present study nanotubular oxide layer on the surface of ultrafine-grained titanium (UFG cpTi), Ti-13Nb-13Zr (UFG TNZ) alloy and coarse-grained Ti-13Nb-13Zr (CG TNZ) alloy was formed using electrochemical anodization in 1M H3PO4 + 0.5 wt % NaF electrolyte, at room temperature during 60 minutes for UFG cpTi and 90 minutes for investigated alloys. The nanotubes morphology was studied using scanning electron microscopy (SEM). The SEM images showed that anodization of titanium and its alloy in a fluoride-containing electrolyte can lead to the formation of a highly regular self-organized nanotubular layer. Furthermore, nanotubes formed on UFG TNZ alloy were more uniformly arranged compared to nanotubes on CG TNZ alloy surface. The aim of this study was to determine the electrochemical behavior of titanium and its alloy after electrochemical anodization. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37°C, in order to simulate the oral environment and examine the above-mentioned materials for dental application. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance. The newly-formed inner barrier and outer porous surface layers were found to be highly resistant with capacitive behavior, but the materials with nanotubular oxide layer on their surface showed improved corrosion resistance.",
publisher = "Materials Research Society of Srebia",
journal = "Materials Research Society of Srebia",
title = "Corrosion behavior of nanotubular oxide layer formed on titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
pages = "101",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5254"
}

Barjaktarević, D., Dimić, I., Cvijović-Alagić, I., Đokić, V., Bajat, J.,& Rakin, M.. (2017). Corrosion behavior of nanotubular oxide layer formed on titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Materials Research Society of Srebia
Materials Research Society of Srebia., 101.
https://hdl.handle.net/21.15107/rcub_technorep_5254

Barjaktarević D, Dimić I, Cvijović-Alagić I, Đokić V, Bajat J, Rakin M. Corrosion behavior of nanotubular oxide layer formed on titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Materials Research Society of Srebia. 2017;:101.
https://hdl.handle.net/21.15107/rcub_technorep_5254 .

Barjaktarević, Dragana, Dimić, Ivana, Cvijović-Alagić, Ivana, Đokić, Veljko, Bajat, Jelena, Rakin, Marko, "Corrosion behavior of nanotubular oxide layer formed on titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Materials Research Society of Srebia (2017):101,
https://hdl.handle.net/21.15107/rcub_technorep_5254 .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko
AU  - Bajat, Jelena
AU  - Rakin, Marko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6196
AB  - U radu su ispitivane legure titana Ti-13Nb-13Zr (u polaznom stanju, CG, i nakon HPT obrade, eng.
high pressure torsion, UFG), kao potencijalnih biomaterijala. Legure su modifikovane formiranjem
nanotubularnih oksidnih slojeva u rastvoru 1M H3PO4 + 0.5 wt% NaF, na sobnoj temperaturi tokom
različitog vremena anodizacije. Cilj rada je određivanje uticaja modifikacije površine Ti legura na
korozionu stabilnost, ispitivanu u simuliranoj telesnoj tečnosti. Ipitivanja su vršena standardnim
elektrohemijskim metodama.
Morfologija modifikovanih površina Ti legura je analizirana skenirajućom elektronskom
mikroskopijom i pokazano je da se anodizacijom dobijaju visoko orijentisani slojevi nanotuba, sa
najravnomernijom raspodelom nanotuba na UFG TNZ leguri. Na osnovu polarizacionih krivih
pokazane su manje gustine struje korozije na anodiziranim uzorcima, koje pored postojanja dve
pseudo-pasivacione oblasti, ukazuju na njihovu veću korozionu stabilnost. Povoljan uticaj procesa
anodizacije je potvrđen i EIS merenjima.
PB  - Srpsko hemijsko društvo / Serbian Chemical Society
C3  - Fifth Conference of Young Chemists of Serbia Society
T1  - Electrochemical behavior of anodic Ti-13Nb-13Zr oxide nanotubes in simulated body fluid
SP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6196
ER  - 

@conference{
author = "Barjaktarević, Dragana and Dimić, Ivana and Cvijović-Alagić, Ivana and Đokić, Veljko and Bajat, Jelena and Rakin, Marko",
year = "2017",
abstract = "U radu su ispitivane legure titana Ti-13Nb-13Zr (u polaznom stanju, CG, i nakon HPT obrade, eng.
high pressure torsion, UFG), kao potencijalnih biomaterijala. Legure su modifikovane formiranjem
nanotubularnih oksidnih slojeva u rastvoru 1M H3PO4 + 0.5 wt% NaF, na sobnoj temperaturi tokom
različitog vremena anodizacije. Cilj rada je određivanje uticaja modifikacije površine Ti legura na
korozionu stabilnost, ispitivanu u simuliranoj telesnoj tečnosti. Ipitivanja su vršena standardnim
elektrohemijskim metodama.
Morfologija modifikovanih površina Ti legura je analizirana skenirajućom elektronskom
mikroskopijom i pokazano je da se anodizacijom dobijaju visoko orijentisani slojevi nanotuba, sa
najravnomernijom raspodelom nanotuba na UFG TNZ leguri. Na osnovu polarizacionih krivih
pokazane su manje gustine struje korozije na anodiziranim uzorcima, koje pored postojanja dve
pseudo-pasivacione oblasti, ukazuju na njihovu veću korozionu stabilnost. Povoljan uticaj procesa
anodizacije je potvrđen i EIS merenjima.",
publisher = "Srpsko hemijsko društvo / Serbian Chemical Society",
journal = "Fifth Conference of Young Chemists of Serbia Society",
title = "Electrochemical behavior of anodic Ti-13Nb-13Zr oxide nanotubes in simulated body fluid",
pages = "101",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6196"
}

Barjaktarević, D., Dimić, I., Cvijović-Alagić, I., Đokić, V., Bajat, J.,& Rakin, M.. (2017). Electrochemical behavior of anodic Ti-13Nb-13Zr oxide nanotubes in simulated body fluid. in Fifth Conference of Young Chemists of Serbia Society
Srpsko hemijsko društvo / Serbian Chemical Society., 101.
https://hdl.handle.net/21.15107/rcub_technorep_6196

Barjaktarević D, Dimić I, Cvijović-Alagić I, Đokić V, Bajat J, Rakin M. Electrochemical behavior of anodic Ti-13Nb-13Zr oxide nanotubes in simulated body fluid. in Fifth Conference of Young Chemists of Serbia Society. 2017;:101.
https://hdl.handle.net/21.15107/rcub_technorep_6196 .

Barjaktarević, Dragana, Dimić, Ivana, Cvijović-Alagić, Ivana, Đokić, Veljko, Bajat, Jelena, Rakin, Marko, "Electrochemical behavior of anodic Ti-13Nb-13Zr oxide nanotubes in simulated body fluid" in Fifth Conference of Young Chemists of Serbia Society (2017):101,
https://hdl.handle.net/21.15107/rcub_technorep_6196 .

TY  - JOUR
AU  - Musraty, Walid
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Likeb, A.
AU  - Cvijović-Alagić, Ivana
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3734
AB  - Integrity of pipes is typically assessed by testing fracture mechanics specimens, such as compact tensile (CT) or single-edge notched bending (SENB). However, for some pipe dimensions it is not easy or possible to fabricate a specimen conforming to the requirements of standard procedures. A new type of specimen is proposed recently, which can be advantageous for relatively small pipe diameters and axial defects - the pipe ring notch bend specimen - PRNB. In this work, criteria for failure by ductile fracture of PRNB specimens are determined experimentally and by application of micromechanical analysis. The influence of size of the specimen, as well as size and shape of the stress concentrator, is analysed. The results of this study, along with previous authors' results, lead to the conclusion that the pipe ring specimens can be applied in integrity assessment of pipes with defects. Also, the benefits of their application include much simpler fabrication and the same material history as the pipe itself.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Fracture Mechanics
T1  - Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis
EP  - 261
SP  - 247
VL  - 175
DO  - 10.1016/j.engfracmech.2017.01.022
ER  - 

@article{
author = "Musraty, Walid and Međo, Bojan and Gubeljak, Nenad and Likeb, A. and Cvijović-Alagić, Ivana and Sedmak, Aleksandar and Rakin, Marko",
year = "2017",
abstract = "Integrity of pipes is typically assessed by testing fracture mechanics specimens, such as compact tensile (CT) or single-edge notched bending (SENB). However, for some pipe dimensions it is not easy or possible to fabricate a specimen conforming to the requirements of standard procedures. A new type of specimen is proposed recently, which can be advantageous for relatively small pipe diameters and axial defects - the pipe ring notch bend specimen - PRNB. In this work, criteria for failure by ductile fracture of PRNB specimens are determined experimentally and by application of micromechanical analysis. The influence of size of the specimen, as well as size and shape of the stress concentrator, is analysed. The results of this study, along with previous authors' results, lead to the conclusion that the pipe ring specimens can be applied in integrity assessment of pipes with defects. Also, the benefits of their application include much simpler fabrication and the same material history as the pipe itself.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Fracture Mechanics",
title = "Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis",
pages = "261-247",
volume = "175",
doi = "10.1016/j.engfracmech.2017.01.022"
}

Musraty, W., Međo, B., Gubeljak, N., Likeb, A., Cvijović-Alagić, I., Sedmak, A.,& Rakin, M.. (2017). Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis. in Engineering Fracture Mechanics
Pergamon-Elsevier Science Ltd, Oxford., 175, 247-261.
https://doi.org/10.1016/j.engfracmech.2017.01.022

Musraty W, Međo B, Gubeljak N, Likeb A, Cvijović-Alagić I, Sedmak A, Rakin M. Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis. in Engineering Fracture Mechanics. 2017;175:247-261.
doi:10.1016/j.engfracmech.2017.01.022 .

Musraty, Walid, Međo, Bojan, Gubeljak, Nenad, Likeb, A., Cvijović-Alagić, Ivana, Sedmak, Aleksandar, Rakin, Marko, "Ductile fracture of pipe-ring notched bend specimens - Micromechanical analysis" in Engineering Fracture Mechanics, 175 (2017):247-261,
https://doi.org/10.1016/j.engfracmech.2017.01.022 . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Veljović, Đorđe
AU  - Rakin, Marko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3616
AB  - The enhancement of commercially pure titanium (cpTi) mechanical properties, which is required for its medical application, can be achieved by grain refinement obtained by severe plastic deformation. In addition to mechanical properties improvement, excellent corrosion resistance of ultrafine-grained (UFG) cpTi in contact with human body fluids is required. Therefore, the aim of this study was to estimate electrochemical behavior of UFG cpTi obtained by high pressure torsion (HPT) under a pressure of 7,8 GPa at room temperature and up to 5 rotations. Electrochemical measurements were performed in artificial saliva at 37 degrees C in order to simulate oral environment, since development of UFG cpTi is primarily aimed for dental implant applications. Electrochemical behavior of UFG cpTi was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The obtained results indicate that HPT process, through significant grain size reduction, increases corrosion resistance of cpTi.
PB  - University of Osijek, Tech Fac, Slavonski Brod
T2  - Tehnicki vjesnik-Technical Gazette
T1  - Corrosion resistance of high pressure torsion obtained commercially pure titanium in acidic solution
EP  - 1695
IS  - 6
SP  - 1689
VL  - 24
DO  - 10.17559/TV-20160303141534
ER  - 

@article{
author = "Barjaktarević, Dragana and Dimić, Ivana and Cvijović-Alagić, Ivana and Veljović, Đorđe and Rakin, Marko",
year = "2017",
abstract = "The enhancement of commercially pure titanium (cpTi) mechanical properties, which is required for its medical application, can be achieved by grain refinement obtained by severe plastic deformation. In addition to mechanical properties improvement, excellent corrosion resistance of ultrafine-grained (UFG) cpTi in contact with human body fluids is required. Therefore, the aim of this study was to estimate electrochemical behavior of UFG cpTi obtained by high pressure torsion (HPT) under a pressure of 7,8 GPa at room temperature and up to 5 rotations. Electrochemical measurements were performed in artificial saliva at 37 degrees C in order to simulate oral environment, since development of UFG cpTi is primarily aimed for dental implant applications. Electrochemical behavior of UFG cpTi was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The obtained results indicate that HPT process, through significant grain size reduction, increases corrosion resistance of cpTi.",
publisher = "University of Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnicki vjesnik-Technical Gazette",
title = "Corrosion resistance of high pressure torsion obtained commercially pure titanium in acidic solution",
pages = "1695-1689",
number = "6",
volume = "24",
doi = "10.17559/TV-20160303141534"
}

Barjaktarević, D., Dimić, I., Cvijović-Alagić, I., Veljović, Đ.,& Rakin, M.. (2017). Corrosion resistance of high pressure torsion obtained commercially pure titanium in acidic solution. in Tehnicki vjesnik-Technical Gazette
University of Osijek, Tech Fac, Slavonski Brod., 24(6), 1689-1695.
https://doi.org/10.17559/TV-20160303141534

Barjaktarević D, Dimić I, Cvijović-Alagić I, Veljović Đ, Rakin M. Corrosion resistance of high pressure torsion obtained commercially pure titanium in acidic solution. in Tehnicki vjesnik-Technical Gazette. 2017;24(6):1689-1695.
doi:10.17559/TV-20160303141534 .

Barjaktarević, Dragana, Dimić, Ivana, Cvijović-Alagić, Ivana, Veljović, Đorđe, Rakin, Marko, "Corrosion resistance of high pressure torsion obtained commercially pure titanium in acidic solution" in Tehnicki vjesnik-Technical Gazette, 24, no. 6 (2017):1689-1695,
https://doi.org/10.17559/TV-20160303141534 . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Cvijović-Alagić, Ivana
AU  - Dimić, Ivana
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3197
AB  - Commercially pure titanium (cpTi) and titanium alloys are the most commonly used metallic biomaterials. Biomedical requirements for the successful usage of metallic implant materials include their high mechanical strength, low elastic modulus, excellent biocompatibility and high corrosion resistance. It is evident that the response of a biomaterial implanted into the human body depends entirely on its biocompatibility and surface properties. Therefore, in order to improve the performance of biomaterials in biological systems modification of their surface is necessary. One of most commonly used method of implant materials surface modification is electrochemical anodization and this method is reviewed in the present work. Aim of the presented review article is to explain the electrochemical anodization process and the way in which the nanotubes are formed by anodization on the metallic material surface. Influence of anodizing parameters on the nanotubes characteristics, such as nanotube diameter, length and nanotubular layer thickness, are described, as well as the anodized nanotubes influence on the material surface properties, corrosion resistance and biocompatibility.
PB  - Association of Metallurgical Engineers of Serbia
T2  - Metallurgical & Materials Engineering
T1  - Anodization of Ti-based materials for biomedical applications: A review
EP  - 143
IS  - 3
SP  - 121
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_vinar_1709
ER  - 

@article{
author = "Barjaktarević, Dragana and Cvijović-Alagić, Ivana and Dimić, Ivana and Đokić, Veljko and Rakin, Marko",
year = "2016",
abstract = "Commercially pure titanium (cpTi) and titanium alloys are the most commonly used metallic biomaterials. Biomedical requirements for the successful usage of metallic implant materials include their high mechanical strength, low elastic modulus, excellent biocompatibility and high corrosion resistance. It is evident that the response of a biomaterial implanted into the human body depends entirely on its biocompatibility and surface properties. Therefore, in order to improve the performance of biomaterials in biological systems modification of their surface is necessary. One of most commonly used method of implant materials surface modification is electrochemical anodization and this method is reviewed in the present work. Aim of the presented review article is to explain the electrochemical anodization process and the way in which the nanotubes are formed by anodization on the metallic material surface. Influence of anodizing parameters on the nanotubes characteristics, such as nanotube diameter, length and nanotubular layer thickness, are described, as well as the anodized nanotubes influence on the material surface properties, corrosion resistance and biocompatibility.",
publisher = "Association of Metallurgical Engineers of Serbia",
journal = "Metallurgical & Materials Engineering",
title = "Anodization of Ti-based materials for biomedical applications: A review",
pages = "143-121",
number = "3",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_vinar_1709"
}

Barjaktarević, D., Cvijović-Alagić, I., Dimić, I., Đokić, V.,& Rakin, M.. (2016). Anodization of Ti-based materials for biomedical applications: A review. in Metallurgical & Materials Engineering
Association of Metallurgical Engineers of Serbia., 22(3), 121-143.
https://hdl.handle.net/21.15107/rcub_vinar_1709

Barjaktarević D, Cvijović-Alagić I, Dimić I, Đokić V, Rakin M. Anodization of Ti-based materials for biomedical applications: A review. in Metallurgical & Materials Engineering. 2016;22(3):121-143.
https://hdl.handle.net/21.15107/rcub_vinar_1709 .

Barjaktarević, Dragana, Cvijović-Alagić, Ivana, Dimić, Ivana, Đokić, Veljko, Rakin, Marko, "Anodization of Ti-based materials for biomedical applications: A review" in Metallurgical & Materials Engineering, 22, no. 3 (2016):121-143,
https://hdl.handle.net/21.15107/rcub_vinar_1709 .

TY  - JOUR
AU  - Cvijović-Alagić, Ivana
AU  - Cvijović, Zorica
AU  - Bajat, Jelena
AU  - Rakin, Marko
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3259
AB  - The electrochemical behaviour of the Ti-6Al-4V ELI alloy with different microstructures was investigated in Ringer's solution at 25 degrees C. It was found that the properties of both inner barrier and outer porous layers of the passive film were dependent on the microstructural morphology and distribution of the alloying elements resulting in various amounts of their oxides incorporated in the TiO2 matrix. A more resistant and capacitive barrier layer formed on the alloy with fully lamellar, martensitic and globular microstructures in different thickness assured its high corrosion protection. The improved corrosion resistance of the alloy with equiaxed microstructure was provided by the existence of the larger amounts of the Al2O3 and V2O5 oxides, contributing to higher resistance of the outer porous layer. The Al2O3 amount is smaller than that of the V2O5 oxide due to its higher dissolution, especially in the case of the alloy with fully lamellar microstructure, resulting in the formation of a more porous outer layer.
PB  - Wiley-VCH Verlag Gmbh, Weinheim
T2  - Materials and Corrosion-Werkstoffe Und Korrosion
T1  - Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment
EP  - 1087
IS  - 10
SP  - 1075
VL  - 67
DO  - 10.1002/maco.201508796
ER  - 

@article{
author = "Cvijović-Alagić, Ivana and Cvijović, Zorica and Bajat, Jelena and Rakin, Marko",
year = "2016",
abstract = "The electrochemical behaviour of the Ti-6Al-4V ELI alloy with different microstructures was investigated in Ringer's solution at 25 degrees C. It was found that the properties of both inner barrier and outer porous layers of the passive film were dependent on the microstructural morphology and distribution of the alloying elements resulting in various amounts of their oxides incorporated in the TiO2 matrix. A more resistant and capacitive barrier layer formed on the alloy with fully lamellar, martensitic and globular microstructures in different thickness assured its high corrosion protection. The improved corrosion resistance of the alloy with equiaxed microstructure was provided by the existence of the larger amounts of the Al2O3 and V2O5 oxides, contributing to higher resistance of the outer porous layer. The Al2O3 amount is smaller than that of the V2O5 oxide due to its higher dissolution, especially in the case of the alloy with fully lamellar microstructure, resulting in the formation of a more porous outer layer.",
publisher = "Wiley-VCH Verlag Gmbh, Weinheim",
journal = "Materials and Corrosion-Werkstoffe Und Korrosion",
title = "Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment",
pages = "1087-1075",
number = "10",
volume = "67",
doi = "10.1002/maco.201508796"
}

Cvijović-Alagić, I., Cvijović, Z., Bajat, J.,& Rakin, M.. (2016). Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment. in Materials and Corrosion-Werkstoffe Und Korrosion
Wiley-VCH Verlag Gmbh, Weinheim., 67(10), 1075-1087.
https://doi.org/10.1002/maco.201508796

Cvijović-Alagić I, Cvijović Z, Bajat J, Rakin M. Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment. in Materials and Corrosion-Werkstoffe Und Korrosion. 2016;67(10):1075-1087.
doi:10.1002/maco.201508796 .

Cvijović-Alagić, Ivana, Cvijović, Zorica, Bajat, Jelena, Rakin, Marko, "Electrochemical behaviour of Ti-6Al-4V alloy with different microstructures in a simulated bio-environment" in Materials and Corrosion-Werkstoffe Und Korrosion, 67, no. 10 (2016):1075-1087,
https://doi.org/10.1002/maco.201508796 . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Voelker, Bernhard
AU  - Hohenwarter, Anton
AU  - Pippan, Reinhard
AU  - Veljović, Đorđe
AU  - Rakin, Marko
AU  - Bugarski, Branko
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3446
AB  - Significant enhancement of mechanical properties of metallic biomaterials can be achieved by grain refinement obtained by severe plastic deformation. The purpose of this study was to determine metallic ion release from commercially pure titanium (CPTi) and Ti-13Nb-13Zr alloy processed by high pressure torsion (HPT). The materials microstructures, in the initial state and after HPT deformation, were examined by scanning and transmission electron microscopy. The microhardness was determined along the radius of the disc-shaped samples of ultrafine-grained (UFG) CPTi and Ti-13Nb-13Zr alloy in order to evaluate homogeneity of HPT-processed materials. The quantities of released ions were determined using inductively coupled plasma-mass spectrophotometer for samples immersed in artificial saliva at 37 degrees C for 7 days. Also, the effect of artificial saliva pH value on metallic ion release was estimated. Obtained results revealed that the quantities of released ions from UFG CPTi and Ti-13Nb-13Zr alloy obtained by HPT process were higher than the quantities of released ions from CPTi and Ti-13Nb-13Zr alloy produced by traditional casting. This behavior can be explained by the fact that metallic ions are easily released from microstructure with smaller grains achieved by HPT process.
PB  - Elsevier Sci Ltd, Oxford
T2  - Materials & Design
T1  - Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
EP  - 347
SP  - 340
VL  - 91
DO  - 10.1016/j.matdes.2015.11.088
ER  - 

@article{
author = "Dimić, Ivana and Cvijović-Alagić, Ivana and Voelker, Bernhard and Hohenwarter, Anton and Pippan, Reinhard and Veljović, Đorđe and Rakin, Marko and Bugarski, Branko",
year = "2016",
abstract = "Significant enhancement of mechanical properties of metallic biomaterials can be achieved by grain refinement obtained by severe plastic deformation. The purpose of this study was to determine metallic ion release from commercially pure titanium (CPTi) and Ti-13Nb-13Zr alloy processed by high pressure torsion (HPT). The materials microstructures, in the initial state and after HPT deformation, were examined by scanning and transmission electron microscopy. The microhardness was determined along the radius of the disc-shaped samples of ultrafine-grained (UFG) CPTi and Ti-13Nb-13Zr alloy in order to evaluate homogeneity of HPT-processed materials. The quantities of released ions were determined using inductively coupled plasma-mass spectrophotometer for samples immersed in artificial saliva at 37 degrees C for 7 days. Also, the effect of artificial saliva pH value on metallic ion release was estimated. Obtained results revealed that the quantities of released ions from UFG CPTi and Ti-13Nb-13Zr alloy obtained by HPT process were higher than the quantities of released ions from CPTi and Ti-13Nb-13Zr alloy produced by traditional casting. This behavior can be explained by the fact that metallic ions are easily released from microstructure with smaller grains achieved by HPT process.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Materials & Design",
title = "Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
pages = "347-340",
volume = "91",
doi = "10.1016/j.matdes.2015.11.088"
}

Dimić, I., Cvijović-Alagić, I., Voelker, B., Hohenwarter, A., Pippan, R., Veljović, Đ., Rakin, M.,& Bugarski, B.. (2016). Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Materials & Design
Elsevier Sci Ltd, Oxford., 91, 340-347.
https://doi.org/10.1016/j.matdes.2015.11.088

Dimić I, Cvijović-Alagić I, Voelker B, Hohenwarter A, Pippan R, Veljović Đ, Rakin M, Bugarski B. Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Materials & Design. 2016;91:340-347.
doi:10.1016/j.matdes.2015.11.088 .

Dimić, Ivana, Cvijović-Alagić, Ivana, Voelker, Bernhard, Hohenwarter, Anton, Pippan, Reinhard, Veljović, Đorđe, Rakin, Marko, Bugarski, Branko, "Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Materials & Design, 91 (2016):340-347,
https://doi.org/10.1016/j.matdes.2015.11.088 . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Obradović, Nataša
AU  - Petrović, Jelena
AU  - Putić, Slaviša
AU  - Rakin, Marko
AU  - Bugarski, Branko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3087
AB  - Metallic materials, such as Co-Cr-Mo alloys, are exposed to aggressive conditions in the oral cavity that represents an ideal environment for metallic ion release and biodegradation. The metallic ions released from dental materials can cause local and/or systemic adverse effects in the human body. Therefore, dental materials are required to possess appropriate mechanical, physical, chemical and biological properties. The biocompatibility of metallic materials is very important for dental applications. Accordingly, the aim of this study was to examine metallic ion release and cytotoxicity of Co-30Cr-5Mo cast alloy as the initial phase of biocompatibility evaluation. Determination of the viability of human (MRC-5) and animal (L929) fibroblast cells were conducted using three in vitro test methods: the colorimetric methyl-thiazol-tetrazolium (MTT) test, the dye exclusion test (DET) and the agar diffusion test (ADT). Furthermore, the morphology and growth of the cells were analyzed using scanning electron microscopy (SEM). The obtained results indicated that Co-30Cr-5Mo alloy did not release harmful elements in concentrations high enough to have detrimental effects on human and animal fibroblasts under the given experimental conditions. Moreover, the fibroblast cells showed good adhesion on the surface of the Co-30Cr-5Mo alloy. Therefore, it could be concluded that Co-30Cr-5Mo alloy is a biocompatible material that could be safely used in dentistry.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy
EP  - 1552
IS  - 12
SP  - 1541
VL  - 80
DO  - 10.2298/JSC150505070M
ER  - 

@article{
author = "Dimić, Ivana and Cvijović-Alagić, Ivana and Obradović, Nataša and Petrović, Jelena and Putić, Slaviša and Rakin, Marko and Bugarski, Branko",
year = "2015",
abstract = "Metallic materials, such as Co-Cr-Mo alloys, are exposed to aggressive conditions in the oral cavity that represents an ideal environment for metallic ion release and biodegradation. The metallic ions released from dental materials can cause local and/or systemic adverse effects in the human body. Therefore, dental materials are required to possess appropriate mechanical, physical, chemical and biological properties. The biocompatibility of metallic materials is very important for dental applications. Accordingly, the aim of this study was to examine metallic ion release and cytotoxicity of Co-30Cr-5Mo cast alloy as the initial phase of biocompatibility evaluation. Determination of the viability of human (MRC-5) and animal (L929) fibroblast cells were conducted using three in vitro test methods: the colorimetric methyl-thiazol-tetrazolium (MTT) test, the dye exclusion test (DET) and the agar diffusion test (ADT). Furthermore, the morphology and growth of the cells were analyzed using scanning electron microscopy (SEM). The obtained results indicated that Co-30Cr-5Mo alloy did not release harmful elements in concentrations high enough to have detrimental effects on human and animal fibroblasts under the given experimental conditions. Moreover, the fibroblast cells showed good adhesion on the surface of the Co-30Cr-5Mo alloy. Therefore, it could be concluded that Co-30Cr-5Mo alloy is a biocompatible material that could be safely used in dentistry.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy",
pages = "1552-1541",
number = "12",
volume = "80",
doi = "10.2298/JSC150505070M"
}

Dimić, I., Cvijović-Alagić, I., Obradović, N., Petrović, J., Putić, S., Rakin, M.,& Bugarski, B.. (2015). In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 80(12), 1541-1552.
https://doi.org/10.2298/JSC150505070M

Dimić I, Cvijović-Alagić I, Obradović N, Petrović J, Putić S, Rakin M, Bugarski B. In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy. in Journal of the Serbian Chemical Society. 2015;80(12):1541-1552.
doi:10.2298/JSC150505070M .

Dimić, Ivana, Cvijović-Alagić, Ivana, Obradović, Nataša, Petrović, Jelena, Putić, Slaviša, Rakin, Marko, Bugarski, Branko, "In vitro biocompatibility assessment of Co-Cr-Mo dental cast alloy" in Journal of the Serbian Chemical Society, 80, no. 12 (2015):1541-1552,
https://doi.org/10.2298/JSC150505070M . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Bajat, Jelena
AU  - Rakin, Marko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5249
AB  - The enhancement of mechanical properties of commercially pure titanium (cpTi) can be achieved by grain refinement obtained by severe plastic deformation, but corrosion resistance of ultrafinegrained (UFG) cpTi is still under discussion. Therefore, the aim of this study was to estimate electrochemical behavior of UFG cpTi obtained by high pressure torsion under a pressure of 7.8GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. Electrochemical measurements were performed in artificial saliva with pH value of 4.0 at 37°C in order to simulate oral environment, because UFG cpTi is primarily developing for dental implant applications. UFG cpTi was investigated by electrochemical impedance spectroscopy (EIS). The obtained results indicate that HPT process significantly reduces the grain size and UFG cpTi shows better corrosion resistance compared to its coarse-grained (CG) counterpart.
PB  - Univerzitet u Beogradu, Mašinski fakultet
C3  - Proceedings of TEAM 2015
T1  - The electrochemical impedance spectroscopy study of ultrafine-grained titanium in artificial saliva
EP  - 339
SP  - 336
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5249
ER  - 

@conference{
author = "Barjaktarević, Dragana and Dimić, Ivana and Cvijović-Alagić, Ivana and Bajat, Jelena and Rakin, Marko",
year = "2015",
abstract = "The enhancement of mechanical properties of commercially pure titanium (cpTi) can be achieved by grain refinement obtained by severe plastic deformation, but corrosion resistance of ultrafinegrained (UFG) cpTi is still under discussion. Therefore, the aim of this study was to estimate electrochemical behavior of UFG cpTi obtained by high pressure torsion under a pressure of 7.8GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. Electrochemical measurements were performed in artificial saliva with pH value of 4.0 at 37°C in order to simulate oral environment, because UFG cpTi is primarily developing for dental implant applications. UFG cpTi was investigated by electrochemical impedance spectroscopy (EIS). The obtained results indicate that HPT process significantly reduces the grain size and UFG cpTi shows better corrosion resistance compared to its coarse-grained (CG) counterpart.",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
journal = "Proceedings of TEAM 2015",
title = "The electrochemical impedance spectroscopy study of ultrafine-grained titanium in artificial saliva",
pages = "339-336",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5249"
}

Barjaktarević, D., Dimić, I., Cvijović-Alagić, I., Bajat, J.,& Rakin, M.. (2015). The electrochemical impedance spectroscopy study of ultrafine-grained titanium in artificial saliva. in Proceedings of TEAM 2015
Univerzitet u Beogradu, Mašinski fakultet., 336-339.
https://hdl.handle.net/21.15107/rcub_technorep_5249

Barjaktarević D, Dimić I, Cvijović-Alagić I, Bajat J, Rakin M. The electrochemical impedance spectroscopy study of ultrafine-grained titanium in artificial saliva. in Proceedings of TEAM 2015. 2015;:336-339.
https://hdl.handle.net/21.15107/rcub_technorep_5249 .

Barjaktarević, Dragana, Dimić, Ivana, Cvijović-Alagić, Ivana, Bajat, Jelena, Rakin, Marko, "The electrochemical impedance spectroscopy study of ultrafine-grained titanium in artificial saliva" in Proceedings of TEAM 2015 (2015):336-339,
https://hdl.handle.net/21.15107/rcub_technorep_5249 .