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Electrolytic copper powder, inert gas atomized prealloyed copper powder containing 3.5 wt.% Al, and a mixture of copper and commercial Al 2 O 3  powder particles (4 wt.% Al 2 O 3 ) were milled separately in a high-energy planetary ball mill for up to 20 h in air. The milling was performed in order to strengthen the copper matrix by grain size refinement and Al 2 O 3  particles. Milling in air of prealloyed copper powder promoted formation of fine dispersed Al 2 O 3  particles by internal oxidation. Hot-pressing (800 °C for 3 h in argon at a pressure of 35 MPa) was used for compaction of milled powders. Compacts from 5 and 20 h milled powders were additionally subjected to high temperature exposure (800 °C for 1 and 5 h in argon) in order to examine their thermal stability and electrical conductivity. The effect of different size and the amount of Al 2 O 3  particles on strengthening, thermal stability and electrical conductivity of the copper-based composites was studied. The results were discussed in terms of the effects of the grain size refinement along with micro- and nano-sized Al 2 O 3  particles on the strengthening of the copper matrix.

Properties of copper composites strengthened by nano- and micro-sized Al 2 O 3 particles