Abstract
A set of nanocomposite Cu–Cr powders with the grain size of these immiscible metals below 5nm were prepared by high-energy ball milling. The powders were then consolidated by short-term (5min) spark plasma sintering at 700–900°C under pressure (50MPa) to obtain essentially pore-free pseudo-alloys. The grain sizes in the produced bulk materials remained within the ranges 5–60nm for Cr-based phase and 200–300nm for Cu-based matrix. These nanocomposites have a Vickers microhardness up to 3.9GPa and a specific electrical resistivity in the range 6–9.6μΩcm, which make them promising candidates for the application in high-voltage circuit breakers.
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