TY  - JOUR
AU  - Kostić, S.
AU  - Lazarević, Zorica Z.
AU  - Radojević, Vesna
AU  - Milutinović, A.
AU  - Romčević, Maja J.
AU  - Romčević, Nebojša Ž.
AU  - Valčić, Andreja
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3044
AB  - Yttrium aluminum garnet (YAG, Y3Al5O12) and yttrium aluminum garnet doped with neodymium (Nd:YAG) single crystals were grown by the Czochralski technique. The critical diameter and the critical rate of rotation were calculated. Suitable polishing and etching solutions were determined. As a result of our experiments, the transparent YAG and pale pink Nd:YAG single crystals were produced. The obtained crystals were studied by X-ray diffraction, Raman and IR spectroscopy. The crystal structure was confirmed by XRD. The 15 Raman and 17 IR modes were observed. The Raman and IR spectroscopy results are in accordance with X-ray diffraction analysis. The obtained YAG and Nd:YAG single crystals were without core and of good optical quality. The absence of a core was confirmed by viewing polished crystal slices. Also, it is important to emphasize that the obtained Nd:YAG single crystal has a concentration of 0.8 wt.% Nd3(+) that is characteristic for laser materials.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Materials Research Bulletin
T1  - Study of structural and optical properties of YAG and Nd:YAG single crystals
EP  - 87
SP  - 80
VL  - 63
DO  - 10.1016/j.materresbull.2014.11.033
ER  - 

@article{
author = "Kostić, S. and Lazarević, Zorica Z. and Radojević, Vesna and Milutinović, A. and Romčević, Maja J. and Romčević, Nebojša Ž. and Valčić, Andreja",
year = "2015",
abstract = "Yttrium aluminum garnet (YAG, Y3Al5O12) and yttrium aluminum garnet doped with neodymium (Nd:YAG) single crystals were grown by the Czochralski technique. The critical diameter and the critical rate of rotation were calculated. Suitable polishing and etching solutions were determined. As a result of our experiments, the transparent YAG and pale pink Nd:YAG single crystals were produced. The obtained crystals were studied by X-ray diffraction, Raman and IR spectroscopy. The crystal structure was confirmed by XRD. The 15 Raman and 17 IR modes were observed. The Raman and IR spectroscopy results are in accordance with X-ray diffraction analysis. The obtained YAG and Nd:YAG single crystals were without core and of good optical quality. The absence of a core was confirmed by viewing polished crystal slices. Also, it is important to emphasize that the obtained Nd:YAG single crystal has a concentration of 0.8 wt.% Nd3(+) that is characteristic for laser materials.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Materials Research Bulletin",
title = "Study of structural and optical properties of YAG and Nd:YAG single crystals",
pages = "87-80",
volume = "63",
doi = "10.1016/j.materresbull.2014.11.033"
}

Kostić, S., Lazarević, Z. Z., Radojević, V., Milutinović, A., Romčević, M. J., Romčević, N. Ž.,& Valčić, A.. (2015). Study of structural and optical properties of YAG and Nd:YAG single crystals. in Materials Research Bulletin
Pergamon-Elsevier Science Ltd, Oxford., 63, 80-87.
https://doi.org/10.1016/j.materresbull.2014.11.033

Kostić S, Lazarević ZZ, Radojević V, Milutinović A, Romčević MJ, Romčević NŽ, Valčić A. Study of structural and optical properties of YAG and Nd:YAG single crystals. in Materials Research Bulletin. 2015;63:80-87.
doi:10.1016/j.materresbull.2014.11.033 .

Kostić, S., Lazarević, Zorica Z., Radojević, Vesna, Milutinović, A., Romčević, Maja J., Romčević, Nebojša Ž., Valčić, Andreja, "Study of structural and optical properties of YAG and Nd:YAG single crystals" in Materials Research Bulletin, 63 (2015):80-87,
https://doi.org/10.1016/j.materresbull.2014.11.033 . .

TY  - JOUR
AU  - Kostić, Slobodanka
AU  - Golubović, Aleksandar
AU  - Valčić, Andreja
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5549
AB  - Ni-based superalloy single crystals were grown by different methods (gradient method and Bridgman technique with spontaneous nucleation and with seed). In all crystal growth experiments using the Bridgman technique, the temperature gradient along the vertical furnace axes was constant (G = 33.5°C/cm). The obtained single crystals were cut, mechanical and chemical polished, and chemically etched. Using a metallographic microscope, the spacing of the primary and secondary dendrites was investigated. The dendrite arm spacing (DAS) was determined using a Quantimet 500 MC. The obtained results are discussed and compared with published data.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Primary and secondary dendrite spacing of Ni-based superalloy single crystals
EP  - 69
IS  - 1
SP  - 61
VL  - 74
DO  - 10.2298/JSC0901061K
ER  - 

@article{
author = "Kostić, Slobodanka and Golubović, Aleksandar and Valčić, Andreja",
year = "2009",
abstract = "Ni-based superalloy single crystals were grown by different methods (gradient method and Bridgman technique with spontaneous nucleation and with seed). In all crystal growth experiments using the Bridgman technique, the temperature gradient along the vertical furnace axes was constant (G = 33.5°C/cm). The obtained single crystals were cut, mechanical and chemical polished, and chemically etched. Using a metallographic microscope, the spacing of the primary and secondary dendrites was investigated. The dendrite arm spacing (DAS) was determined using a Quantimet 500 MC. The obtained results are discussed and compared with published data.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Primary and secondary dendrite spacing of Ni-based superalloy single crystals",
pages = "69-61",
number = "1",
volume = "74",
doi = "10.2298/JSC0901061K"
}

Kostić, S., Golubović, A.,& Valčić, A.. (2009). Primary and secondary dendrite spacing of Ni-based superalloy single crystals. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 74(1), 61-69.
https://doi.org/10.2298/JSC0901061K

Kostić S, Golubović A, Valčić A. Primary and secondary dendrite spacing of Ni-based superalloy single crystals. in Journal of the Serbian Chemical Society. 2009;74(1):61-69.
doi:10.2298/JSC0901061K .

Kostić, Slobodanka, Golubović, Aleksandar, Valčić, Andreja, "Primary and secondary dendrite spacing of Ni-based superalloy single crystals" in Journal of the Serbian Chemical Society, 74, no. 1 (2009):61-69,
https://doi.org/10.2298/JSC0901061K . .

TY  - JOUR
AU  - Radojević, Vesna
AU  - Valčić, Andreja
AU  - Nikolić, Slobodanka
AU  - Golubović, Aleksandar
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1006
AB  - The evolution of the crystallization front from a planar to a dendritic one as a function of the G L/(Rc 0) parameter was investigated during the crystallization of Al-Cu alloys by the vertical Bridgman method. Six series of alloys with different initial compositions of Cu were solidified at different growth rates. A mathematical model for the heat transfer during vertical Bridgmen crystal growth was developed. The model was solved using the finite element method. The temperature gradient in the melt at the beginning of crystal growth was calculated using the obtained model. Discrete stages of the crystallization front were identified in the experiments, as the ratio G L/(Rc 0) decreased.
AB  - U okviru ovog rada ispitivana je transformacija fronta kristalizacije od ravnog ka dendritnoj strukturi kao funkcija parametra GL/(Rc0) pri kristalizaciji legure Al-Cu metodom vertikalni Bridgman. U tom cilju izvedeni su eksperimenti sa šest serija uzoraka različitih početnih koncentracija i različitim brzinama rasta. Izveden je i matematički model procesa rasta kristala metodom vertikalni Bridgman korišćenjem metode konačnih elemenata. Na osnovu matematičkog modela izračunat je temperaturni gradijent u rastopu u trenutku kada započinje rast kristala. U okviru eksperimentalnog opsega sa sniženjem vrednosti parametra GL/(Rc0) dolazi do postepenog razvoja fronta kristalizacije po etapama.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - The plane-to-cellular-to-dendrite transition of the shape of the crystallization front during the crystallization of Al-Cu alloys
T1  - Prelaz sa ravnog fronta kristalizacije na ćelijski i dendritni rast kod kristalizacije legure Al-Cu
EP  - 312
IS  - 3
SP  - 303
VL  - 71
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1006
ER  - 

@article{
author = "Radojević, Vesna and Valčić, Andreja and Nikolić, Slobodanka and Golubović, Aleksandar",
year = "2006",
abstract = "The evolution of the crystallization front from a planar to a dendritic one as a function of the G L/(Rc 0) parameter was investigated during the crystallization of Al-Cu alloys by the vertical Bridgman method. Six series of alloys with different initial compositions of Cu were solidified at different growth rates. A mathematical model for the heat transfer during vertical Bridgmen crystal growth was developed. The model was solved using the finite element method. The temperature gradient in the melt at the beginning of crystal growth was calculated using the obtained model. Discrete stages of the crystallization front were identified in the experiments, as the ratio G L/(Rc 0) decreased., U okviru ovog rada ispitivana je transformacija fronta kristalizacije od ravnog ka dendritnoj strukturi kao funkcija parametra GL/(Rc0) pri kristalizaciji legure Al-Cu metodom vertikalni Bridgman. U tom cilju izvedeni su eksperimenti sa šest serija uzoraka različitih početnih koncentracija i različitim brzinama rasta. Izveden je i matematički model procesa rasta kristala metodom vertikalni Bridgman korišćenjem metode konačnih elemenata. Na osnovu matematičkog modela izračunat je temperaturni gradijent u rastopu u trenutku kada započinje rast kristala. U okviru eksperimentalnog opsega sa sniženjem vrednosti parametra GL/(Rc0) dolazi do postepenog razvoja fronta kristalizacije po etapama.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "The plane-to-cellular-to-dendrite transition of the shape of the crystallization front during the crystallization of Al-Cu alloys, Prelaz sa ravnog fronta kristalizacije na ćelijski i dendritni rast kod kristalizacije legure Al-Cu",
pages = "312-303",
number = "3",
volume = "71",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1006"
}

Radojević, V., Valčić, A., Nikolić, S.,& Golubović, A.. (2006). The plane-to-cellular-to-dendrite transition of the shape of the crystallization front during the crystallization of Al-Cu alloys. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 71(3), 303-312.
https://hdl.handle.net/21.15107/rcub_technorep_1006

Radojević V, Valčić A, Nikolić S, Golubović A. The plane-to-cellular-to-dendrite transition of the shape of the crystallization front during the crystallization of Al-Cu alloys. in Journal of the Serbian Chemical Society. 2006;71(3):303-312.
https://hdl.handle.net/21.15107/rcub_technorep_1006 .

Radojević, Vesna, Valčić, Andreja, Nikolić, Slobodanka, Golubović, Aleksandar, "The plane-to-cellular-to-dendrite transition of the shape of the crystallization front during the crystallization of Al-Cu alloys" in Journal of the Serbian Chemical Society, 71, no. 3 (2006):303-312,
https://hdl.handle.net/21.15107/rcub_technorep_1006 .

TY  - JOUR
AU  - Golubović, Aleksandar
AU  - Nikolić, Slobodanka
AU  - Đurić, Stevan
AU  - Valčić, Andreja
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5503
AB  - Ruby (Cr:Al2O3) single crystals were grown by the Czochralski technique in an argon atmosphere. The critical crystal diameter dc = 1.0 cm and the critical rate of rotation ωc = 20 rpm were calculated by equations of the hydrodynamics of the melt. The rate of crystal growth was experimentally obtained to be 2.7 mm/h. For chemical polishing, conc. H3PO4 at 593 K for an exposure of 3 hours was determined. Conc. H3PO4 at 523 K for an exposure of 3 h was found to be a suitable etching solution. The lattice parameters a = 0.47627(6) nm and c = 1.301(1) nm were determined by X-ray powder diffraction. The obtained results are discussed and compared with published data.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - The growth of ruby single crystals
T1  - Раст монокристала рубина
EP  - 95
IS  - 1
SP  - 87
VL  - 70
DO  - 10.2298/JSC0501087G
ER  - 

@article{
author = "Golubović, Aleksandar and Nikolić, Slobodanka and Đurić, Stevan and Valčić, Andreja",
year = "2005",
abstract = "Ruby (Cr:Al2O3) single crystals were grown by the Czochralski technique in an argon atmosphere. The critical crystal diameter dc = 1.0 cm and the critical rate of rotation ωc = 20 rpm were calculated by equations of the hydrodynamics of the melt. The rate of crystal growth was experimentally obtained to be 2.7 mm/h. For chemical polishing, conc. H3PO4 at 593 K for an exposure of 3 hours was determined. Conc. H3PO4 at 523 K for an exposure of 3 h was found to be a suitable etching solution. The lattice parameters a = 0.47627(6) nm and c = 1.301(1) nm were determined by X-ray powder diffraction. The obtained results are discussed and compared with published data.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The growth of ruby single crystals, Раст монокристала рубина",
pages = "95-87",
number = "1",
volume = "70",
doi = "10.2298/JSC0501087G"
}

Golubović, A., Nikolić, S., Đurić, S.,& Valčić, A.. (2005). The growth of ruby single crystals. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 70(1), 87-95.
https://doi.org/10.2298/JSC0501087G

Golubović A, Nikolić S, Đurić S, Valčić A. The growth of ruby single crystals. in Journal of the Serbian Chemical Society. 2005;70(1):87-95.
doi:10.2298/JSC0501087G .

Golubović, Aleksandar, Nikolić, Slobodanka, Đurić, Stevan, Valčić, Andreja, "The growth of ruby single crystals" in Journal of the Serbian Chemical Society, 70, no. 1 (2005):87-95,
https://doi.org/10.2298/JSC0501087G . .

TY  - JOUR
AU  - Nikolić, Slobodanka N.
AU  - Golubović, Aleksandar
AU  - Radojević, Vesna
AU  - Valčić, Andreja
AU  - Jordović, Branka
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/668
AB  - In this paper investigation of the influence of the crystallization conditions on the interface shape during the solidification of Ni-based Superalloy by Vertical Bridgman method were investigated. The samples were undertaken of the metallographic investigation of the microstructure. The critical rate of plane-to-cellular interface transition, Rpc, was defined and calculated.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - The influence of the interface shape on the plane-to-cellular-to-dendritic transition in superalloy based of nickel
EP  - 293
IS  - 3
SP  - 289
VL  - 10
UR  - https://hdl.handle.net/21.15107/rcub_technorep_668
ER  - 

@article{
author = "Nikolić, Slobodanka N. and Golubović, Aleksandar and Radojević, Vesna and Valčić, Andreja and Jordović, Branka",
year = "2004",
abstract = "In this paper investigation of the influence of the crystallization conditions on the interface shape during the solidification of Ni-based Superalloy by Vertical Bridgman method were investigated. The samples were undertaken of the metallographic investigation of the microstructure. The critical rate of plane-to-cellular interface transition, Rpc, was defined and calculated.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "The influence of the interface shape on the plane-to-cellular-to-dendritic transition in superalloy based of nickel",
pages = "293-289",
number = "3",
volume = "10",
url = "https://hdl.handle.net/21.15107/rcub_technorep_668"
}

Nikolić, S. N., Golubović, A., Radojević, V., Valčić, A.,& Jordović, B.. (2004). The influence of the interface shape on the plane-to-cellular-to-dendritic transition in superalloy based of nickel. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 10(3), 289-293.
https://hdl.handle.net/21.15107/rcub_technorep_668

Nikolić SN, Golubović A, Radojević V, Valčić A, Jordović B. The influence of the interface shape on the plane-to-cellular-to-dendritic transition in superalloy based of nickel. in Metalurgija. 2004;10(3):289-293.
https://hdl.handle.net/21.15107/rcub_technorep_668 .

Nikolić, Slobodanka N., Golubović, Aleksandar, Radojević, Vesna, Valčić, Andreja, Jordović, Branka, "The influence of the interface shape on the plane-to-cellular-to-dendritic transition in superalloy based of nickel" in Metalurgija, 10, no. 3 (2004):289-293,
https://hdl.handle.net/21.15107/rcub_technorep_668 .

TY  - JOUR
AU  - Nikolić, Slobodanka N.
AU  - Radojević, Vesna
AU  - Valčić, Andreja
AU  - Golubović, Aleksandar
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/549
AB  - This paper elaborates the investigations about influence of the cellular structure of the seed to the distance between primary dendrites, λ1 Investigations were performed on superalloy single crystals based Ni which were obtained using Bridgman method.
AB  - U okviru ovog rada izvršena su istraživanja uticaja ćelijske strukture klice na rastojanje između primarnih dendrita, λ1. Istraživanja su vršena na monokristalima superlegure na bazi Ni, koji su dobijeni rastom iz rastopa po metodi Bridgeman.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni
T1  - Uticaj ćelijske strukture klice na strukturu monokristala superlegure na bazi Ni
EP  - 84
IS  - 1
SP  - 77
VL  - 9
UR  - https://hdl.handle.net/21.15107/rcub_technorep_549
ER  - 

@article{
author = "Nikolić, Slobodanka N. and Radojević, Vesna and Valčić, Andreja and Golubović, Aleksandar",
year = "2003",
abstract = "This paper elaborates the investigations about influence of the cellular structure of the seed to the distance between primary dendrites, λ1 Investigations were performed on superalloy single crystals based Ni which were obtained using Bridgman method., U okviru ovog rada izvršena su istraživanja uticaja ćelijske strukture klice na rastojanje između primarnih dendrita, λ1. Istraživanja su vršena na monokristalima superlegure na bazi Ni, koji su dobijeni rastom iz rastopa po metodi Bridgeman.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni, Uticaj ćelijske strukture klice na strukturu monokristala superlegure na bazi Ni",
pages = "84-77",
number = "1",
volume = "9",
url = "https://hdl.handle.net/21.15107/rcub_technorep_549"
}

Nikolić, S. N., Radojević, V., Valčić, A.,& Golubović, A.. (2003). The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 9(1), 77-84.
https://hdl.handle.net/21.15107/rcub_technorep_549

Nikolić SN, Radojević V, Valčić A, Golubović A. The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni. in Metalurgija. 2003;9(1):77-84.
https://hdl.handle.net/21.15107/rcub_technorep_549 .

Nikolić, Slobodanka N., Radojević, Vesna, Valčić, Andreja, Golubović, Aleksandar, "The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni" in Metalurgija, 9, no. 1 (2003):77-84,
https://hdl.handle.net/21.15107/rcub_technorep_549 .

TY  - JOUR
AU  - Nikolić, Slobodanka N.
AU  - Radojević, Vesna
AU  - Valčić, Andreja
AU  - Golubović, Aleksandar
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/547
AB  - This paper elaborates the investigations about influence of the cellular structure of the seed to the distance between primary dendrites, λ1. Investigations were performed on superalloy single crystals based Ni which were obtained using Bridgman method.
AB  - U okviru ovog rada izvršena su istraživanja uticaja ćelijske strukture klice na rastojanje između primarnih dendrita, λ1 Istraživanja su vršena na monokristalima superlegure na bazi Ni, koji su dobijeni rastom iz rastopa po metodi Bridgman.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni
T1  - Uticaj ćelijske strukture klice na strukturu monokristala superlegure na bazi Ni
EP  - 138
IS  - 2
SP  - 131
VL  - 9
UR  - https://hdl.handle.net/21.15107/rcub_technorep_547
ER  - 

@article{
author = "Nikolić, Slobodanka N. and Radojević, Vesna and Valčić, Andreja and Golubović, Aleksandar",
year = "2003",
abstract = "This paper elaborates the investigations about influence of the cellular structure of the seed to the distance between primary dendrites, λ1. Investigations were performed on superalloy single crystals based Ni which were obtained using Bridgman method., U okviru ovog rada izvršena su istraživanja uticaja ćelijske strukture klice na rastojanje između primarnih dendrita, λ1 Istraživanja su vršena na monokristalima superlegure na bazi Ni, koji su dobijeni rastom iz rastopa po metodi Bridgman.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni, Uticaj ćelijske strukture klice na strukturu monokristala superlegure na bazi Ni",
pages = "138-131",
number = "2",
volume = "9",
url = "https://hdl.handle.net/21.15107/rcub_technorep_547"
}

Nikolić, S. N., Radojević, V., Valčić, A.,& Golubović, A.. (2003). The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 9(2), 131-138.
https://hdl.handle.net/21.15107/rcub_technorep_547

Nikolić SN, Radojević V, Valčić A, Golubović A. The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni. in Metalurgija. 2003;9(2):131-138.
https://hdl.handle.net/21.15107/rcub_technorep_547 .

Nikolić, Slobodanka N., Radojević, Vesna, Valčić, Andreja, Golubović, Aleksandar, "The influence of the cellular structure of the seed on the structure single crystal superalloy based on Ni" in Metalurgija, 9, no. 2 (2003):131-138,
https://hdl.handle.net/21.15107/rcub_technorep_547 .

TY  - JOUR
AU  - Radojević, Vesna
AU  - Valčić, Andreja
AU  - Nikolić, S
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/426
AB  - Results presented in this paper contribute to investigation of the influence of solidification rate (R) and the initial concentration of solute (C-o) on the interface shape and the distribution of the solute. Solidification of Al-Cu alloy was performed using Vertical Bridgman method. Within the range of experimental solidification rates, the change of interface shape from planar to cellular has been observed and investigated. According to distribution of the solute, the k(e) (Cu) was calculated for each solidification rate and k(e) as a function of R was presented.
PB  - Elsevier, Amsterdam
T2  - Materials Letters
T1  - Interface shape and distribution of solute during Vertical Bridgman growth of Al-Cu alloy
EP  - 254
IS  - 4-5
SP  - 248
VL  - 52
DO  - 10.1016/S0167-577X(01)00402-5
ER  - 

@article{
author = "Radojević, Vesna and Valčić, Andreja and Nikolić, S",
year = "2002",
abstract = "Results presented in this paper contribute to investigation of the influence of solidification rate (R) and the initial concentration of solute (C-o) on the interface shape and the distribution of the solute. Solidification of Al-Cu alloy was performed using Vertical Bridgman method. Within the range of experimental solidification rates, the change of interface shape from planar to cellular has been observed and investigated. According to distribution of the solute, the k(e) (Cu) was calculated for each solidification rate and k(e) as a function of R was presented.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Letters",
title = "Interface shape and distribution of solute during Vertical Bridgman growth of Al-Cu alloy",
pages = "254-248",
number = "4-5",
volume = "52",
doi = "10.1016/S0167-577X(01)00402-5"
}

Radojević, V., Valčić, A.,& Nikolić, S.. (2002). Interface shape and distribution of solute during Vertical Bridgman growth of Al-Cu alloy. in Materials Letters
Elsevier, Amsterdam., 52(4-5), 248-254.
https://doi.org/10.1016/S0167-577X(01)00402-5

Radojević V, Valčić A, Nikolić S. Interface shape and distribution of solute during Vertical Bridgman growth of Al-Cu alloy. in Materials Letters. 2002;52(4-5):248-254.
doi:10.1016/S0167-577X(01)00402-5 .

Radojević, Vesna, Valčić, Andreja, Nikolić, S, "Interface shape and distribution of solute during Vertical Bridgman growth of Al-Cu alloy" in Materials Letters, 52, no. 4-5 (2002):248-254,
https://doi.org/10.1016/S0167-577X(01)00402-5 . .

TY  - JOUR
AU  - Radojević, Vesna
AU  - Nikolić, Slobodanka N.
AU  - Valčić, Andreja
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/454
AB  - In this paper investigation of the influence of the solidification conditions on the interface shape and distribution of solute during the solidification of AI-Cu alloy by vertical Bridgman method were investigated. The microstructure of the samples was metallographically investigated. Optical emission spectrometry was used for chemical analysis of distribution of the solute concentration along the specimen. Within experimental range of growth rates the plane-to-cellular and cellular-to-dendrite transition was observed. According to the distribution of the solute along the sample, the effective distribution coefficient kc was calculated, and by observing its value, the influence of growth rate (R) on the distribution of the solute in solid was investigated.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - The influence of the solidification rate on the interface shape and distribution of solute
EP  - 228
IS  - 3
SP  - 223
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_454
ER  - 

@article{
author = "Radojević, Vesna and Nikolić, Slobodanka N. and Valčić, Andreja",
year = "2002",
abstract = "In this paper investigation of the influence of the solidification conditions on the interface shape and distribution of solute during the solidification of AI-Cu alloy by vertical Bridgman method were investigated. The microstructure of the samples was metallographically investigated. Optical emission spectrometry was used for chemical analysis of distribution of the solute concentration along the specimen. Within experimental range of growth rates the plane-to-cellular and cellular-to-dendrite transition was observed. According to the distribution of the solute along the sample, the effective distribution coefficient kc was calculated, and by observing its value, the influence of growth rate (R) on the distribution of the solute in solid was investigated.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "The influence of the solidification rate on the interface shape and distribution of solute",
pages = "228-223",
number = "3",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_454"
}

Radojević, V., Nikolić, S. N.,& Valčić, A.. (2002). The influence of the solidification rate on the interface shape and distribution of solute. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 8(3), 223-228.
https://hdl.handle.net/21.15107/rcub_technorep_454

Radojević V, Nikolić SN, Valčić A. The influence of the solidification rate on the interface shape and distribution of solute. in Metalurgija. 2002;8(3):223-228.
https://hdl.handle.net/21.15107/rcub_technorep_454 .

Radojević, Vesna, Nikolić, Slobodanka N., Valčić, Andreja, "The influence of the solidification rate on the interface shape and distribution of solute" in Metalurgija, 8, no. 3 (2002):223-228,
https://hdl.handle.net/21.15107/rcub_technorep_454 .

TY  - JOUR
AU  - Radojević, Vesna
AU  - Valčić, Andreja
AU  - Nikolić, Slobodanka N.
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/453
AB  - Influence of the solidification rate, temperature gradient and initial concentration of the solute on the interface shape was investigated during solidification from the melt. The dependence of the microstructure on the parameter G/(RC0) was observed. As the value of G/(RC0) was lowered the shape of the interface was changed from the plane to the cellular and than to the dendrites. Specific microstructure correspond to the particular range of the G/(RCo) value.
AB  - Ispitivan je uticaj brzine očvršćavanja, temperaturnog gradijenta i početne koncentracije rastvorljive komponente na razvoj oblika granice faza tokom očvršćavanja iz rastopa. Uočena je zavisnost mikrostrukture uzoraka od parametra G/(RC()). Sa opadanjem vrednosti ovog parametra dolazi do postepene promene oblika granice faza od ravne, preko ćelijske do dendritne. Odredjenom opsegu vrednosti parametra G/(RC0) odovara i odredjena mikrostruktura.
PB  - Savez inženjera metalurgije Srbije, Beograd
T2  - Metalurgija
T1  - Dependence of the solid-liquid interface structure on the solidification process parameters
T1  - Zavisnost strukture granice faza tečno-čvrsto od parametara procesa očvršćavanja
EP  - 323
IS  - 4
SP  - 317
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_453
ER  - 

@article{
author = "Radojević, Vesna and Valčić, Andreja and Nikolić, Slobodanka N.",
year = "2002",
abstract = "Influence of the solidification rate, temperature gradient and initial concentration of the solute on the interface shape was investigated during solidification from the melt. The dependence of the microstructure on the parameter G/(RC0) was observed. As the value of G/(RC0) was lowered the shape of the interface was changed from the plane to the cellular and than to the dendrites. Specific microstructure correspond to the particular range of the G/(RCo) value., Ispitivan je uticaj brzine očvršćavanja, temperaturnog gradijenta i početne koncentracije rastvorljive komponente na razvoj oblika granice faza tokom očvršćavanja iz rastopa. Uočena je zavisnost mikrostrukture uzoraka od parametra G/(RC()). Sa opadanjem vrednosti ovog parametra dolazi do postepene promene oblika granice faza od ravne, preko ćelijske do dendritne. Odredjenom opsegu vrednosti parametra G/(RC0) odovara i odredjena mikrostruktura.",
publisher = "Savez inženjera metalurgije Srbije, Beograd",
journal = "Metalurgija",
title = "Dependence of the solid-liquid interface structure on the solidification process parameters, Zavisnost strukture granice faza tečno-čvrsto od parametara procesa očvršćavanja",
pages = "323-317",
number = "4",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_453"
}

Radojević, V., Valčić, A.,& Nikolić, S. N.. (2002). Dependence of the solid-liquid interface structure on the solidification process parameters. in Metalurgija
Savez inženjera metalurgije Srbije, Beograd., 8(4), 317-323.
https://hdl.handle.net/21.15107/rcub_technorep_453

Radojević V, Valčić A, Nikolić SN. Dependence of the solid-liquid interface structure on the solidification process parameters. in Metalurgija. 2002;8(4):317-323.
https://hdl.handle.net/21.15107/rcub_technorep_453 .

Radojević, Vesna, Valčić, Andreja, Nikolić, Slobodanka N., "Dependence of the solid-liquid interface structure on the solidification process parameters" in Metalurgija, 8, no. 4 (2002):317-323,
https://hdl.handle.net/21.15107/rcub_technorep_453 .

TY  - JOUR
AU  - Golubović, Aleksandar
AU  - Nikolić, Slobodanka
AU  - Djurić, Stevan
AU  - Valčić, Andreja
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5363
AB  - Sapphire (Al2O3) single crystals were grown by the Czochralski technique both in air and argon atmospheres. The conditions for growing sapphire single crystals were calculated by using a combination of Reynolds and Grashof numbers. A critical crystal diameter dc = 20 mm and the critical rate of rotation ωc = 20 rpm were calculated from the hydrodynamics of the melt. The value of the rate of crystal growth was experimentally found to be 3.5 mm/h. According to our previous experiments, it was confirmed that three hours exposures to cone. H3PO4 at 593 K was suitable for chemical polishing. Also, three hours exposure to cone. H3PO4 at 523 K was found to be a suitable etching solution. The lattice parameters a = 0.47573 nm and c = 1.29893 nm were determined by X-ray powder diffraction. The obtained results are discussed and compared with published data.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - The growth of sapphire single crystals
EP  - 418
IS  - 6
SP  - 411
VL  - 66
DO  - 10.2298/jsc0106411g
ER  - 

@article{
author = "Golubović, Aleksandar and Nikolić, Slobodanka and Djurić, Stevan and Valčić, Andreja",
year = "2001",
abstract = "Sapphire (Al2O3) single crystals were grown by the Czochralski technique both in air and argon atmospheres. The conditions for growing sapphire single crystals were calculated by using a combination of Reynolds and Grashof numbers. A critical crystal diameter dc = 20 mm and the critical rate of rotation ωc = 20 rpm were calculated from the hydrodynamics of the melt. The value of the rate of crystal growth was experimentally found to be 3.5 mm/h. According to our previous experiments, it was confirmed that three hours exposures to cone. H3PO4 at 593 K was suitable for chemical polishing. Also, three hours exposure to cone. H3PO4 at 523 K was found to be a suitable etching solution. The lattice parameters a = 0.47573 nm and c = 1.29893 nm were determined by X-ray powder diffraction. The obtained results are discussed and compared with published data.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The growth of sapphire single crystals",
pages = "418-411",
number = "6",
volume = "66",
doi = "10.2298/jsc0106411g"
}

Golubović, A., Nikolić, S., Djurić, S.,& Valčić, A.. (2001). The growth of sapphire single crystals. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 66(6), 411-418.
https://doi.org/10.2298/jsc0106411g

Golubović A, Nikolić S, Djurić S, Valčić A. The growth of sapphire single crystals. in Journal of the Serbian Chemical Society. 2001;66(6):411-418.
doi:10.2298/jsc0106411g .

Golubović, Aleksandar, Nikolić, Slobodanka, Djurić, Stevan, Valčić, Andreja, "The growth of sapphire single crystals" in Journal of the Serbian Chemical Society, 66, no. 6 (2001):411-418,
https://doi.org/10.2298/jsc0106411g . .

TY  - CONF
AU  - Radojević, Vesna
AU  - Valčić, Andreja
AU  - Nikolić, Slobodanka
AU  - Milutinović-Nikolić, Aleksandra
PY  - 1999
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/222
AB  - Phenomenon of solidification process plays an important role in various areas like: crystal growth, casting processes, liquid phase sintering etc. Results presented in this paper contribute to investigation of the influence of solidification rate (R) on the interface shape and the solute segregation.
PB  - Springer Science and Business Media LLC
C3  - Advanced Science and Technology of Sintering
T1  - Investigation of the Microstructure and Distribution of Solute During Solidification of Al-Cu Alloy
EP  - 615
SP  - 611
DO  - 10.1007/978-1-4419-8666-5_87
ER  - 

@conference{
author = "Radojević, Vesna and Valčić, Andreja and Nikolić, Slobodanka and Milutinović-Nikolić, Aleksandra",
year = "1999",
abstract = "Phenomenon of solidification process plays an important role in various areas like: crystal growth, casting processes, liquid phase sintering etc. Results presented in this paper contribute to investigation of the influence of solidification rate (R) on the interface shape and the solute segregation.",
publisher = "Springer Science and Business Media LLC",
journal = "Advanced Science and Technology of Sintering",
title = "Investigation of the Microstructure and Distribution of Solute During Solidification of Al-Cu Alloy",
pages = "615-611",
doi = "10.1007/978-1-4419-8666-5_87"
}

Radojević, V., Valčić, A., Nikolić, S.,& Milutinović-Nikolić, A.. (1999). Investigation of the Microstructure and Distribution of Solute During Solidification of Al-Cu Alloy. in Advanced Science and Technology of Sintering
Springer Science and Business Media LLC., 611-615.
https://doi.org/10.1007/978-1-4419-8666-5_87

Radojević V, Valčić A, Nikolić S, Milutinović-Nikolić A. Investigation of the Microstructure and Distribution of Solute During Solidification of Al-Cu Alloy. in Advanced Science and Technology of Sintering. 1999;:611-615.
doi:10.1007/978-1-4419-8666-5_87 .

Radojević, Vesna, Valčić, Andreja, Nikolić, Slobodanka, Milutinović-Nikolić, Aleksandra, "Investigation of the Microstructure and Distribution of Solute During Solidification of Al-Cu Alloy" in Advanced Science and Technology of Sintering (1999):611-615,
https://doi.org/10.1007/978-1-4419-8666-5_87 . .

TY  - JOUR
AU  - Nikolić, SN
AU  - Valčić, Andreja
AU  - Radojević, Vesna
PY  - 1998
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/190
AB  - So far, in our work aimed at obtaining single crystals of a Ni based superalloy, we have investigated the possibilities of obtaining single crystals using different methods as well as the influence of growth conditions, seed structure and abrupt changes in the growth rate (from lower to higher and from higher to lower) on the structure of the obtained single crystals. Using our experimental data, we have made an attempt to show whether there is a dependence between the growth rate (R), temperature gradient (G) and the distance between the primary dendrites (lambda(1)) of the following type lambda(1)=A.G(-m).R-n, and to establish the value of n. We have commenced a research on the influence of the growth rate, and its change during the experiment, on the distance between the secondary dendrites (lambda(2)) and their shape and size.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Advanced Materials and Processes: Yucomat II
T1  - The effect of growth rate on the structure of primary and secondary dendrites of single crystal of Ni based superalloy
EP  - 336
SP  - 331
VL  - 282-2
DO  - 10.4028/www.scientific.net/MSF.282-283.331
ER  - 

@article{
author = "Nikolić, SN and Valčić, Andreja and Radojević, Vesna",
year = "1998",
abstract = "So far, in our work aimed at obtaining single crystals of a Ni based superalloy, we have investigated the possibilities of obtaining single crystals using different methods as well as the influence of growth conditions, seed structure and abrupt changes in the growth rate (from lower to higher and from higher to lower) on the structure of the obtained single crystals. Using our experimental data, we have made an attempt to show whether there is a dependence between the growth rate (R), temperature gradient (G) and the distance between the primary dendrites (lambda(1)) of the following type lambda(1)=A.G(-m).R-n, and to establish the value of n. We have commenced a research on the influence of the growth rate, and its change during the experiment, on the distance between the secondary dendrites (lambda(2)) and their shape and size.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Advanced Materials and Processes: Yucomat II",
title = "The effect of growth rate on the structure of primary and secondary dendrites of single crystal of Ni based superalloy",
pages = "336-331",
volume = "282-2",
doi = "10.4028/www.scientific.net/MSF.282-283.331"
}

Nikolić, S., Valčić, A.,& Radojević, V.. (1998). The effect of growth rate on the structure of primary and secondary dendrites of single crystal of Ni based superalloy. in Advanced Materials and Processes: Yucomat II
Trans Tech Publications Ltd, Durnten-Zurich., 282-2, 331-336.
https://doi.org/10.4028/www.scientific.net/MSF.282-283.331

Nikolić S, Valčić A, Radojević V. The effect of growth rate on the structure of primary and secondary dendrites of single crystal of Ni based superalloy. in Advanced Materials and Processes: Yucomat II. 1998;282-2:331-336.
doi:10.4028/www.scientific.net/MSF.282-283.331 .

Nikolić, SN, Valčić, Andreja, Radojević, Vesna, "The effect of growth rate on the structure of primary and secondary dendrites of single crystal of Ni based superalloy" in Advanced Materials and Processes: Yucomat II, 282-2 (1998):331-336,
https://doi.org/10.4028/www.scientific.net/MSF.282-283.331 . .