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 . .

TY  - JOUR
AU  - Rajković, Višeslava M.
AU  - Božić, Dušan
AU  - Vracarić, D
AU  - Romhanji, Endre
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/852
AB  - Prealloyed copper powder containing 2.5wt. %Al was processed in a planetary ball mill to evaluate matrix hardening due to formation of Al2O3 particles in situ by internal oxidation. After milling, the powders were heat treated in hydrogen in order to reduce copper oxide formed on particle surfaces during milling. The compacts were made by hot pressing. The examinations show that the compacts possess a good combination of high strength and high electrical conductivities. After 5h of milling the microhardness of the prealloyed compact was 3 to 4 times higher than that of the as-received electrolytic copper compacted under the same conditions, while the conductivity was 68% IACS. Also, it was found that the prealloyed compacts preserved much of the hardness after exposure to high temperature in inert atmospheres.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Current Research in Advanced Materials and Processes
T1  - Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al
EP  - 497
SP  - 493
VL  - 494
DO  - 10.4028/www.scientific.net/MSF.494.493
ER  - 

@article{
author = "Rajković, Višeslava M. and Božić, Dušan and Vracarić, D and Romhanji, Endre",
year = "2005",
abstract = "Prealloyed copper powder containing 2.5wt. %Al was processed in a planetary ball mill to evaluate matrix hardening due to formation of Al2O3 particles in situ by internal oxidation. After milling, the powders were heat treated in hydrogen in order to reduce copper oxide formed on particle surfaces during milling. The compacts were made by hot pressing. The examinations show that the compacts possess a good combination of high strength and high electrical conductivities. After 5h of milling the microhardness of the prealloyed compact was 3 to 4 times higher than that of the as-received electrolytic copper compacted under the same conditions, while the conductivity was 68% IACS. Also, it was found that the prealloyed compacts preserved much of the hardness after exposure to high temperature in inert atmospheres.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Current Research in Advanced Materials and Processes",
title = "Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al",
pages = "497-493",
volume = "494",
doi = "10.4028/www.scientific.net/MSF.494.493"
}

Rajković, V. M., Božić, D., Vracarić, D.,& Romhanji, E.. (2005). Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al. in Current Research in Advanced Materials and Processes
Trans Tech Publications Ltd, Durnten-Zurich., 494, 493-497.
https://doi.org/10.4028/www.scientific.net/MSF.494.493

Rajković VM, Božić D, Vracarić D, Romhanji E. Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al. in Current Research in Advanced Materials and Processes. 2005;494:493-497.
doi:10.4028/www.scientific.net/MSF.494.493 .

Rajković, Višeslava M., Božić, Dušan, Vracarić, D, Romhanji, Endre, "Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al" in Current Research in Advanced Materials and Processes, 494 (2005):493-497,
https://doi.org/10.4028/www.scientific.net/MSF.494.493 . .

TY  - JOUR
AU  - Rajković, Višeslava M.
AU  - Božić, D.
AU  - Vračarić, D.
AU  - Romhanji, Endre
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/739
AB  - Prealloyed copper powder containing 2.5wt. %Al was processed in a planetary ball mill to evaluate matrix hardening due to formation of Al2O 3 particles in situ by internal oxidation. After milling, the powders were heat treated in hydrogen in order to reduce copper oxide formed on particle surfaces during milling. The compacts were made by hot pressing. The examinations show that the compacts possess a good combination of high strength and high electrical conductivities. After 5h of milling the microhardness of the prealloyed compact was 3 to 4 times higher than that of the as-received electrolytic copper compacted under the same conditions, while the conductivity was 68% IACS. Also, it was found that the prealloyed compacts preserved much of the hardness after exposure to high temperature in inert atmospheres.
PB  - 6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes
T2  - Materials Science Forum
T1  - Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al
EP  - 498
SP  - 493
VL  - 494
DO  - 10.4028/0-87849-971-7.493
ER  - 

@article{
author = "Rajković, Višeslava M. and Božić, D. and Vračarić, D. and Romhanji, Endre",
year = "2005",
abstract = "Prealloyed copper powder containing 2.5wt. %Al was processed in a planetary ball mill to evaluate matrix hardening due to formation of Al2O 3 particles in situ by internal oxidation. After milling, the powders were heat treated in hydrogen in order to reduce copper oxide formed on particle surfaces during milling. The compacts were made by hot pressing. The examinations show that the compacts possess a good combination of high strength and high electrical conductivities. After 5h of milling the microhardness of the prealloyed compact was 3 to 4 times higher than that of the as-received electrolytic copper compacted under the same conditions, while the conductivity was 68% IACS. Also, it was found that the prealloyed compacts preserved much of the hardness after exposure to high temperature in inert atmospheres.",
publisher = "6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes",
journal = "Materials Science Forum",
title = "Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al",
pages = "498-493",
volume = "494",
doi = "10.4028/0-87849-971-7.493"
}

Rajković, V. M., Božić, D., Vračarić, D.,& Romhanji, E.. (2005). Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al. in Materials Science Forum
6th Conference of the Yugoslav Materials Research Society, YUCOMAT VI: Current Research in Advanced Materials and Processes., 494, 493-498.
https://doi.org/10.4028/0-87849-971-7.493

Rajković VM, Božić D, Vračarić D, Romhanji E. Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al. in Materials Science Forum. 2005;494:493-498.
doi:10.4028/0-87849-971-7.493 .

Rajković, Višeslava M., Božić, D., Vračarić, D., Romhanji, Endre, "Properties of dispersion-hardened copper made by internal oxidation of prealloyed copper powder containing 2.5wt. % Al" in Materials Science Forum, 494 (2005):493-498,
https://doi.org/10.4028/0-87849-971-7.493 . .

TY  - JOUR
AU  - Rajković, Višeslava M.
AU  - Erić, Olivera
AU  - Božić, Dušan
AU  - Mitkov, M.
AU  - Romhanji, Endre
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/646
AB  - The copper matrix has been dispersion strengthened with 3wt.%Al2O3 by mechanical alloying. Commercial alumina powder with an average particle size of 0.75mm was used for alloying. The mechanical alloying process was performed in a planetary ball mill up to 20h in air. After milling all powders were treated in H2 at 4000C for 1h, and finally hot pressing was used for compaction (800oC, 3h, Ar). Structure observations revealed a lamellar structure (Al2O3 particles largely restricted to interlamellar planes between adjacent copper lamellae) accompanied also by structure refinement. These structural changes were mostly completed in the early stage of milling, and retained after compaction. Micro hardness was found to progressively increase with milling time. So, after 5h of milling the micro hardness of the Cu+3twt%Al2O3 compact was 1540MPa, i.e. 2.5 times greater than for the as-received electrolytic copper powder (638MPa) compacted under identical conditions, while after 20h of milling it was 2370 MPa. However after exposing the tested compact at 800oC up to 5h, the achieved hardening effect vanished.
AB  - Osnova bakra disperzno je ojačana mehaničkim legiranjem sa 3tež.,%Al2O3. Za ojačavanje je korišćen komercijalni prah Al2O3 prosečne veličine čestica 0,75mm. Mehaničko legiranje izvršeno je u planetarnom mlinu sa čeličnim kuglama u trajanju do 20h. Posle redukcije (4000C/1h, H2), prahovi su kompaktirani toplim presovanjem (8000C/3h, Ar, 34MPa). Već na početku mlevenja prahova došlo je do usitnjavanja zrna i stvaranja lamelarne strukture, sa česticama Al2O3 raspoređenim po površinama susednih lamela. Ova struktura čestica praha zadržala se i posle kompaktiranja. Sa vremenom mlevenja mikrotvrdoća kompakata raste do 2370MPa. Posle 5h mlevenja mikrotvrdoća kompakata Cu+3tež.%Al2O3 (1540MPa) je 2,5 puta veća u odnosu na mikrotvrdoću kompakta od praha elektrolitičkog bakra komapktiranog pod istim uslovima (638HV). Međutim, efekat ojačavanja gubi se nakon žarenja na 800oC.
PB  - International Institute for the Science of Sintering, Beograd
T2  - Science of Sintering
T1  - Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying
EP  - 211
IS  - 3
SP  - 205
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_technorep_646
ER  - 

@article{
author = "Rajković, Višeslava M. and Erić, Olivera and Božić, Dušan and Mitkov, M. and Romhanji, Endre",
year = "2004",
abstract = "The copper matrix has been dispersion strengthened with 3wt.%Al2O3 by mechanical alloying. Commercial alumina powder with an average particle size of 0.75mm was used for alloying. The mechanical alloying process was performed in a planetary ball mill up to 20h in air. After milling all powders were treated in H2 at 4000C for 1h, and finally hot pressing was used for compaction (800oC, 3h, Ar). Structure observations revealed a lamellar structure (Al2O3 particles largely restricted to interlamellar planes between adjacent copper lamellae) accompanied also by structure refinement. These structural changes were mostly completed in the early stage of milling, and retained after compaction. Micro hardness was found to progressively increase with milling time. So, after 5h of milling the micro hardness of the Cu+3twt%Al2O3 compact was 1540MPa, i.e. 2.5 times greater than for the as-received electrolytic copper powder (638MPa) compacted under identical conditions, while after 20h of milling it was 2370 MPa. However after exposing the tested compact at 800oC up to 5h, the achieved hardening effect vanished., Osnova bakra disperzno je ojačana mehaničkim legiranjem sa 3tež.,%Al2O3. Za ojačavanje je korišćen komercijalni prah Al2O3 prosečne veličine čestica 0,75mm. Mehaničko legiranje izvršeno je u planetarnom mlinu sa čeličnim kuglama u trajanju do 20h. Posle redukcije (4000C/1h, H2), prahovi su kompaktirani toplim presovanjem (8000C/3h, Ar, 34MPa). Već na početku mlevenja prahova došlo je do usitnjavanja zrna i stvaranja lamelarne strukture, sa česticama Al2O3 raspoređenim po površinama susednih lamela. Ova struktura čestica praha zadržala se i posle kompaktiranja. Sa vremenom mlevenja mikrotvrdoća kompakata raste do 2370MPa. Posle 5h mlevenja mikrotvrdoća kompakata Cu+3tež.%Al2O3 (1540MPa) je 2,5 puta veća u odnosu na mikrotvrdoću kompakta od praha elektrolitičkog bakra komapktiranog pod istim uslovima (638HV). Međutim, efekat ojačavanja gubi se nakon žarenja na 800oC.",
publisher = "International Institute for the Science of Sintering, Beograd",
journal = "Science of Sintering",
title = "Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying",
pages = "211-205",
number = "3",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_technorep_646"
}

Rajković, V. M., Erić, O., Božić, D., Mitkov, M.,& Romhanji, E.. (2004). Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying. in Science of Sintering
International Institute for the Science of Sintering, Beograd., 36(3), 205-211.
https://hdl.handle.net/21.15107/rcub_technorep_646

Rajković VM, Erić O, Božić D, Mitkov M, Romhanji E. Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying. in Science of Sintering. 2004;36(3):205-211.
https://hdl.handle.net/21.15107/rcub_technorep_646 .

Rajković, Višeslava M., Erić, Olivera, Božić, Dušan, Mitkov, M., Romhanji, Endre, "Characterization of dispersion strengthened copper with 3wt%Al2O3 by mechanical alloying" in Science of Sintering, 36, no. 3 (2004):205-211,
https://hdl.handle.net/21.15107/rcub_technorep_646 .

TY  - JOUR
AU  - Rajković, Višeslava M.
AU  - Romhanji, Endre
AU  - Mitkov, M
PY  - 2002
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/494
PB  - Springer, Dordrecht
T2  - Journal of Materials Science Letters
T1  - Characterization of high-energy ball milled prealloyed copper powder containing 2.5 wt%Al
EP  - 173
IS  - 2
SP  - 169
VL  - 21
DO  - 10.1023/A:1014209618494
ER  - 

@article{
author = "Rajković, Višeslava M. and Romhanji, Endre and Mitkov, M",
year = "2002",
publisher = "Springer, Dordrecht",
journal = "Journal of Materials Science Letters",
title = "Characterization of high-energy ball milled prealloyed copper powder containing 2.5 wt%Al",
pages = "173-169",
number = "2",
volume = "21",
doi = "10.1023/A:1014209618494"
}

Rajković, V. M., Romhanji, E.,& Mitkov, M.. (2002). Characterization of high-energy ball milled prealloyed copper powder containing 2.5 wt%Al. in Journal of Materials Science Letters
Springer, Dordrecht., 21(2), 169-173.
https://doi.org/10.1023/A:1014209618494

Rajković VM, Romhanji E, Mitkov M. Characterization of high-energy ball milled prealloyed copper powder containing 2.5 wt%Al. in Journal of Materials Science Letters. 2002;21(2):169-173.
doi:10.1023/A:1014209618494 .

Rajković, Višeslava M., Romhanji, Endre, Mitkov, M, "Characterization of high-energy ball milled prealloyed copper powder containing 2.5 wt%Al" in Journal of Materials Science Letters, 21, no. 2 (2002):169-173,
https://doi.org/10.1023/A:1014209618494 . .