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 . .