Influence Mechanism of Texture Evolution on Residual Stress under Thermal-Ultrasonic Treatment

Abstract

Thermal-ultrasonic coupling residual stress release experiment of C19400 copper alloy strip was carried out with self-made experimental device under different ultrasonic amplitudes. The texture evolution and residual stress relaxation of the strip were systematically studied. The results show that, with the increasing ultrasonic amplitude, the strength of cubic texture decreased, while the strength of Brass texture increased. Low-angle grain boundaries were mainly formed in brass texture owing to its high Taylor factor. The slip and interaction of dislocations lead to the grain rotation and the change in texture type, which was the main reason for the relaxation of residual stress.