Effect of Shock-Wave Loading on the Internal Microstructure and Mechanical Properties of Fine-Grained Copper

摘要

It is shown that preloading of fine-grained copper with a the grain size of 0.5 m by a shock wave of intensity ≈25—50 GPa does not lead to changes in its internal microstructure and mechanical properties, and the dislocation density increases only slightly from 1.8;; 10~(11) cm~(-2) in the initial state to (3.1-3.6);; 10~(11) cm~(-2) after shock-wave loading. An increase in shock wave intensity to pressures > 55 GPa leads to a decrease in the dislocation density to 2.5;; 10~9 cm~(-2), an increase in the grain size to ≈19μm, the occurrence of microtwins inside the grains, and a reduction in the mechanical properties of fine-grained copper to the level of coarse-crystalline copper.