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Properties of Dispersion-Hardened Copper Made by Internal Oxidation of Prealloyed Copper Powder Containing 2.5 wt. % Al

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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.

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Periodical:

Materials Science Forum (Volume 494)

Pages:

493-498

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.494.493

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Online since:

September 2005

Authors:

V. Rajković, D. Božić, D. Vračarić, E. Romhanji

Keywords:

Copper Matrix Hardening, Dispersion-Hardened Copper, High-Energy Ball Milling (HEM), Internal Oxidation in Air

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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