The Dynamic Properties of Low-Alloyed Copper Alloys with a Submicrocrystalline Structure Obtained by High-Strain-Rate Deformation

Abstract

Abstract—The mechanical properties of alloys Cu–0.03 wt % Zr and Cu–0.10 wt % Cr with a submicrocrystalline structure formed during dynamic channel-angular pressing and subsequent annealing. The properties of the alloys were studied under shock compression conditions with a pressure of 4.7–7.0 GPa and a deformation rate of (1.3–3.2) × 105 s–1. It is shown that grain grinding from 200–400 to 0.3–1.0 microns increases the dynamic elastic limit and the dynamic yield strength of the Cu–0.03% Zr alloy by 1.9 and 1.8 times, respectively, but reduces the shear strength by 1.4 times. Subsequent annealing at 400 and 450°C can increase the characteristics of the elastic-plastic transition by 3.0 and 3.7 times, respectively, and increase the shear strength to the level of a large-crystal analog. It is determined that the dispersion of the Cu–0.10% Cr alloy structure to 1.0–5.0 microns increases not only the dynamic elastic limit and dynamic yield strength by 3.7 and 2.6 times, respectively, and the shear strength by 1.5 times, compared with its value in the coarse-grained state.