Bauschinger-Like Effect of AZ31 Magnesium Alloy Wide Sheet During the Straightening Process

Abstract

The Bauschinger-like effect, which showed up in the straightening process of the AZ31 magnesium alloy wide sheet, was investigated through the multi-pass discrete three-point bending–unloading–bending (BUB) experiments. The stress variable, anisotropy, and asymmetry of tension and compression on the straightening process were corresponding to the Bauschinger-like effect. The Bauschinger-like effect in the initial, intermediate, and end of the straightening process was dominated by the twinning, detwinning, and dislocation induced by pyramidal slip, respectively. Also, they were responsible for the transformation of the Bauschinger stress parameter (BSP) and Bauschinger energy parameter (BEP). Later, the anisotropic nonlinear kinematic hardening model (ANK model) to describe the Bauschinger-like effect was optimized and simplified.