Estimation of the Barocryodeformation Effect on the Microstructure and Mechanical Properties of Copper

The microstructure, mechanical and acoustic properties of copper samples in the initial state and after barocryodeformation in different modes have been studied. It is shown that cryogenic temperatures contribute to significant grain refinement due to the activation of mechanical twinning processes; a homogeneous structure with an average grain size of 5–8 µm is formed. Barocryodeformation at temperatures up to 125 K leads to a decrease in plasticity and a significant increase in hardness. A further decrease in temperature, on the contrary, contributes to a significant increase in plasticity, as well as a decrease in hardness. A correlation has been noted between the median frequency of acoustic emission and the hardness value at all barocryodeformation temperatures.