Deformation mechanism of blank holder area in deep drawing process for AZ31 magnesium alloy

Abstract

In order to explore the deformation mechanism of the blank holder area of AZ31 magnesium alloy under deep drawing process, a set of physical experiment devices were designed for simulating the deep drawing process of sheet metal at room (RT) and warm temperature (250 °C). Numerical simulations are performed using both macroscopic and microscopic methods. The combination of EBSD analysis and multi-scale simulation are adopted to investigate the stress state, deformation mechanisms and the texture evolution during deformation. The results show the triaxial stress state, where compression in ND and TD, and tension in RD. At the beginning of deformation, the basal slip and tension twins start simultaneously. With the strain increases, the prismatic slips are activated and play an important role in the deformation, meanwhile, the activation of tension twin is gradually reduced. After the deformation, the basal texture of the rolled sheet is weakened, and a small portion of the grains is deflected toward the RD direction.