Abstract
In the present work, copper powder (purity99.7%, grain size63 Am maximum) was mechanically alloyed with lithium
(purity>99%) in a SPEX ball mill. The alloying process was carried out for 15 h under an argon atmosphere using WC
containers and stainless steel balls. The alloyed powders were then hot-consolidated by uniaxial hot pressing at different
temperatures (300, 400, 500, and 550 jC) for 3 h at a pressure of 90 MPa, again under an argon atmosphere. The compacted
samples were then characterized metallurgically, mechanically, and electrically; some of the properties (porosity, hardness,
tensile strength, and electrical resistivity) are reported and analyzed in the present paper. The best results were obtained using a
consolidation temperature of 400 jCa condition which led to a microstructure showing low porosity, a hardness significantly
higher than the other samples, and a tensile strength very similar to that for OFHC copper compacted in the same manner. The
electrical resistivity was found to be small compared with that of other copper alloys used nowadays in large industrial
applications.
D 2003 Elsevier Inc. All rights reserved SPEX8000D 高能量球磨机
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