Jovanović, Milan T.

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1739da37-b9f7-43cd-bdad-da3fad9ea6f7
  • Jovanović, Milan T. (3)
  • Jovanović, Milan (1)
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Author's Bibliography

Cyclic oxidation of Ti3Al-based materials

Cvijović-Alagić, Ivana; Cvijović, Zorica M.; Zagorac, Dejan; Jovanović, Milan T.

(2019)

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 . .
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Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling

Rajković, Višnja; Božić, Dušan; Popović, Miljana; Jovanović, Milan

(Savez inženjera metalurgije Srbije, 2009)

TY  - JOUR
AU  - Rajković, Višnja
AU  - Božić, Dušan
AU  - Popović, Miljana
AU  - Jovanović, Milan
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7299
AB  - Copper-based composites were obtained using high energy milling. The inert gas-atomized prealloyed copper powder (average particle size - 30 μm) containing 2 wt.% Al, and the mixture of electrolytic copper powder (average particle size – 30 and 15 μm) with 4 wt.% comertial Al2O3 powders (average particle size –0.75μm) served as starting materials. These powders were separately milled in air up to 20 h in the planetary ball mill. Milling of prealloyed copper powder promotes formation of nano-sized Al2O3 particles by internal oxidation with oxygen from air. It was calculated that by internal oxidation of 2 wt.% aluminum approximately 3.7 wt.% Al2O3 was generated in the copper matrix. Milled powders were treated in hydrogen at 400 °C for 1 h in order to eliminate copper oxides formed at the surface during milling. Compaction executed by hot-pressing was carried out in an argon atmosphere at 800 °C for 1 h under the pressure of 35 MPa. Compacts obtained from 5 and 20 h milled powders were additionally subjected to high-temperature exposure in argon at 800 °C for 1 and 5 h. The results were discussed in terms of the effects of different size of starting powder particles on structure, strengthening of copper matrix, thermal stability and electrical conductivity of the Cu - Al2O3 composite.
PB  - Savez inženjera metalurgije Srbije
T2  - Metalurgija
T1  - Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling
EP  - 52
IS  - 1
SP  - 45
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7299
ER  - 
@article{
author = "Rajković, Višnja and Božić, Dušan and Popović, Miljana and Jovanović, Milan",
year = "2009",
abstract = "Copper-based composites were obtained using high energy milling. The inert gas-atomized prealloyed copper powder (average particle size - 30 μm) containing 2 wt.% Al, and the mixture of electrolytic copper powder (average particle size – 30 and 15 μm) with 4 wt.% comertial Al2O3 powders (average particle size –0.75μm) served as starting materials. These powders were separately milled in air up to 20 h in the planetary ball mill. Milling of prealloyed copper powder promotes formation of nano-sized Al2O3 particles by internal oxidation with oxygen from air. It was calculated that by internal oxidation of 2 wt.% aluminum approximately 3.7 wt.% Al2O3 was generated in the copper matrix. Milled powders were treated in hydrogen at 400 °C for 1 h in order to eliminate copper oxides formed at the surface during milling. Compaction executed by hot-pressing was carried out in an argon atmosphere at 800 °C for 1 h under the pressure of 35 MPa. Compacts obtained from 5 and 20 h milled powders were additionally subjected to high-temperature exposure in argon at 800 °C for 1 and 5 h. The results were discussed in terms of the effects of different size of starting powder particles on structure, strengthening of copper matrix, thermal stability and electrical conductivity of the Cu - Al2O3 composite.",
publisher = "Savez inženjera metalurgije Srbije",
journal = "Metalurgija",
title = "Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling",
pages = "52-45",
number = "1",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7299"
}
Rajković, V., Božić, D., Popović, M.,& Jovanović, M.. (2009). Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling. in Metalurgija
Savez inženjera metalurgije Srbije., 15(1), 45-52.
https://hdl.handle.net/21.15107/rcub_technorep_7299
Rajković V, Božić D, Popović M, Jovanović M. Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling. in Metalurgija. 2009;15(1):45-52.
https://hdl.handle.net/21.15107/rcub_technorep_7299 .
Rajković, Višnja, Božić, Dušan, Popović, Miljana, Jovanović, Milan, "Properties of Cu-Al2O3 Powder and Compact Composites of Various Starting Particle Size Obtained by High-Energy Milling" in Metalurgija, 15, no. 1 (2009):45-52,
https://hdl.handle.net/21.15107/rcub_technorep_7299 .

The Influence of Powder Particle Size on Properties of Cu-Al2O3 Composites

Rajković, Višeslava M.; Božić, Dušan; Popović, Miljana; Jovanović, Milan T.

(International Institute for the Science of Sintering (IISS), 2009)

TY  - JOUR
AU  - Rajković, Višeslava M.
AU  - Božić, Dušan
AU  - Popović, Miljana
AU  - Jovanović, Milan T.
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5542
AB  - Inert gas atomized prealloyed copper powder containing 2 wt.% Al (average particle size approximate to 30 mu m) and a mixture consisting of copper (average particle sizes approximate to 15 mu m and 30 mu m) and 4 wt.% of commercial Al2O3 powder particles (average particle size approximate to 0.75 mu m) were milled separately in a high-energy planetary ball mill up to 20 h in air. Milling was performed in order to strengthen the copper matrix by grain size refinement and Al2O3 particles. Milling in air of prealloyed copper powder promoted formation of finely dispersed nano-sized Al2O3 particles by internal oxidation. On the other side, composite powders with commercial micro-sized Al2O3 particles were obtained by mechanical alloying. Following milling, powders were treated in hydrogen at 400 degrees C for 1h in order to eliminate copper oxides formed on their surface during milling. Hot pressing (800 degrees C for 3 h in argon at pressure of 35 MPa) was used for compaction of milled powders. Hot pressed composite compacts processed from 5 and 20 h milled powders were additionally subjected to high temperature exposure (800 degrees C for 1 and 5 h in argon) in order to examine their thermal stability. The results were discussed in terms of the effects of different size of starting powders, the grain size refinement and different size of Al2O3 particles on strengthening, thermal stability and electrical conductivity of copper-based composites.
PB  - International Institute for the Science of Sintering (IISS)
T2  - Science of Sintering
T1  - The Influence of Powder Particle Size on Properties of Cu-Al2O3 Composites
EP  - 192
IS  - 2
SP  - 185
VL  - 41
DO  - 10.2298/SOS0902185R
ER  - 
@article{
author = "Rajković, Višeslava M. and Božić, Dušan and Popović, Miljana and Jovanović, Milan T.",
year = "2009",
abstract = "Inert gas atomized prealloyed copper powder containing 2 wt.% Al (average particle size approximate to 30 mu m) and a mixture consisting of copper (average particle sizes approximate to 15 mu m and 30 mu m) and 4 wt.% of commercial Al2O3 powder particles (average particle size approximate to 0.75 mu m) were milled separately in a high-energy planetary ball mill up to 20 h in air. Milling was performed in order to strengthen the copper matrix by grain size refinement and Al2O3 particles. Milling in air of prealloyed copper powder promoted formation of finely dispersed nano-sized Al2O3 particles by internal oxidation. On the other side, composite powders with commercial micro-sized Al2O3 particles were obtained by mechanical alloying. Following milling, powders were treated in hydrogen at 400 degrees C for 1h in order to eliminate copper oxides formed on their surface during milling. Hot pressing (800 degrees C for 3 h in argon at pressure of 35 MPa) was used for compaction of milled powders. Hot pressed composite compacts processed from 5 and 20 h milled powders were additionally subjected to high temperature exposure (800 degrees C for 1 and 5 h in argon) in order to examine their thermal stability. The results were discussed in terms of the effects of different size of starting powders, the grain size refinement and different size of Al2O3 particles on strengthening, thermal stability and electrical conductivity of copper-based composites.",
publisher = "International Institute for the Science of Sintering (IISS)",
journal = "Science of Sintering",
title = "The Influence of Powder Particle Size on Properties of Cu-Al2O3 Composites",
pages = "192-185",
number = "2",
volume = "41",
doi = "10.2298/SOS0902185R"
}
Rajković, V. M., Božić, D., Popović, M.,& Jovanović, M. T.. (2009). The Influence of Powder Particle Size on Properties of Cu-Al2O3 Composites. in Science of Sintering
International Institute for the Science of Sintering (IISS)., 41(2), 185-192.
https://doi.org/10.2298/SOS0902185R
Rajković VM, Božić D, Popović M, Jovanović MT. The Influence of Powder Particle Size on Properties of Cu-Al2O3 Composites. in Science of Sintering. 2009;41(2):185-192.
doi:10.2298/SOS0902185R .
Rajković, Višeslava M., Božić, Dušan, Popović, Miljana, Jovanović, Milan T., "The Influence of Powder Particle Size on Properties of Cu-Al2O3 Composites" in Science of Sintering, 41, no. 2 (2009):185-192,
https://doi.org/10.2298/SOS0902185R . .
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Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti

Cancarević, M; Jovanović, Milan T.; Romhanji, Endre; Zec, Slavica

(Carl Hanser Verlag, Munich, 2005)

TY  - JOUR
AU  - Cancarević, M
AU  - Jovanović, Milan T.
AU  - Romhanji, Endre
AU  - Zec, Slavica
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/810
AB  - Light and scanning electron microscopy (SEM), X-ray diffraction analysis, hardness and uniaxial tensile tests have been applied to study the mechanism and kinetics of aging of the Cu-5 wt.% Ni-2.5 wt.% Ti alloy under the influence of static and dynamic conditions. Hardening of alloy during aging is a consequence of precipitation of (Ni, Cu)(3)Ti secondary particles with the hcp crystal structure, i.e., the same as the eta phase (Ni3Ti). During static (SSA) and dynamic strain aging (DSA), the strength of the alloy is increased compared to quench aging (QA). This effect is most pronounced during the dynamic process. The total concentration of vacancies participating in the process of DSA is increased compared to the vacancy concentration during SSA and QA. This may be explained by the fact that vacancies are not annihilated at dislocations, but their concentration is preserved through the vacancy - precipitate reaction.
PB  - Carl Hanser Verlag, Munich
T2  - Zeitschrift Fur Metallkunde
T1  - Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti
EP  - 82
IS  - 1
SP  - 78
VL  - 96
DO  - 10.3139/146.018075
ER  - 
@article{
author = "Cancarević, M and Jovanović, Milan T. and Romhanji, Endre and Zec, Slavica",
year = "2005",
abstract = "Light and scanning electron microscopy (SEM), X-ray diffraction analysis, hardness and uniaxial tensile tests have been applied to study the mechanism and kinetics of aging of the Cu-5 wt.% Ni-2.5 wt.% Ti alloy under the influence of static and dynamic conditions. Hardening of alloy during aging is a consequence of precipitation of (Ni, Cu)(3)Ti secondary particles with the hcp crystal structure, i.e., the same as the eta phase (Ni3Ti). During static (SSA) and dynamic strain aging (DSA), the strength of the alloy is increased compared to quench aging (QA). This effect is most pronounced during the dynamic process. The total concentration of vacancies participating in the process of DSA is increased compared to the vacancy concentration during SSA and QA. This may be explained by the fact that vacancies are not annihilated at dislocations, but their concentration is preserved through the vacancy - precipitate reaction.",
publisher = "Carl Hanser Verlag, Munich",
journal = "Zeitschrift Fur Metallkunde",
title = "Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti",
pages = "82-78",
number = "1",
volume = "96",
doi = "10.3139/146.018075"
}
Cancarević, M., Jovanović, M. T., Romhanji, E.,& Zec, S.. (2005). Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti. in Zeitschrift Fur Metallkunde
Carl Hanser Verlag, Munich., 96(1), 78-82.
https://doi.org/10.3139/146.018075
Cancarević M, Jovanović MT, Romhanji E, Zec S. Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti. in Zeitschrift Fur Metallkunde. 2005;96(1):78-82.
doi:10.3139/146.018075 .
Cancarević, M, Jovanović, Milan T., Romhanji, Endre, Zec, Slavica, "Mechanism and kinetics of aging of high-strength Cu-5 wt.% Ni-2.5 wt.% Ti" in Zeitschrift Fur Metallkunde, 96, no. 1 (2005):78-82,
https://doi.org/10.3139/146.018075 . .