Abstract
The microstructure, mechanical and functional properties, including electrical and wear resistances have been investigated for the Cu-0.09%Cr-0.08%Zr and Cu-0.14%Cr-0.04%Zr alloys subjected to high-speed dynamic channel angular pressing (DCAP) followed by annealing (aging). It was shown that DCAP led to the formation of a submicrocrystalline (SMC) structure (d = 200–400 nm) with second-phase precipitates up to 5 nm in a size. The sequence of decomposition of a copper based α solid solution, accompanied by recrystallization and precipitation of second-phase nanoparticles during annealing (aging), was determined. DCAP and aging at 400-450 °C led to a decrease in the electrical resistance of the Cu-Cr-Zr alloys from 4.2 to 2.1 µΩ·cm and to a drastic increase in their strength properties (σu from 197 to 542 MPa, σ0.2 from 94 to 464 MPa), while retaining reasonable ductility. It was revealed that the SMC structure processed by DCAP and annealing (aging) at 400 °C can be additionally strengthened after sliding friction tests due to the formation of a nanocrystalline structure in the surface layer.
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