Abstract
Nanostructured pseudoalloys of immiscible Cu, Cr and W metals were prepared by combined use of high-energy ball milling (HEBM) and spark plasma sintering (SPS). Mechanical alloying in an Activator-2S planetary ball mill for 150 min provides a uniform distribution of refractory Cr and W particles in a moldable Cu matrix on a submicron and nanoscale level. Activated W–Cu–Cr powders were SPS-consolidated at 800−1000°C and 50 MPa for 10 min. The effect of preparation conditions on the microstructure, crystal structure, and properties (density, hardness, electric resistivity) of synthesized nanostructured W–Cu–Cr pseudoalloys was studied. The consolidated W–Cu–Cr composites showed a hardness of up to 9.5 GPa and an electric conductivity of 27–28% IACS, which makes them promising for use as an interrupter contact material.
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