Deformation Behavior of a Copper Single Crystal upon Loading by Spherically Converging Shock Waves

Abstract

X-ray diffraction analysis, optical metallography examination, and microhardness measurements were used to investigate a copper single crystal sphere 34 mm in diameter after loading by spherically converging shock waves. It has been established that the deformation structure formed after shock loading depends on both the direction of shock wave propagation in the initial single crystal and the depth of the layer location in the sphere. This study found that high-rate plastic deformation of the copper single crystal under the studied loading conditions occurs mainly by slipping. In addition, “noncrystallographic” slip bands and localized deformation bands were observed in middle and deep layers. Shear bands were shown to nucleate both on the loading surface and inside the single crystal during shock wave propagation. No adiabatic shear bands were observed.