Deformation Behavior of the Mg–Zn–Ca–Ce Alloy Sheets Subjected to Uniaxial and Biaxial Tensile Tests

Abstract

The uniaxial tensile test and Erichsen test are performed on the different deformation behavior under different stress states. The materials used in this paper had obvious anisotropy in the rolling plane because of the bimodal textures along the transverse direction. However, the Mg alloy with the weakest texture distribution did not get the better plasticity and formability, which was related to the enhanced grain boundary cohesion by more Zn addition. The rate of dislocations storage was independent of load direction for a given Mg alloy, even if Mg alloy has large in-plane anisotropy at lower stress levels. There was something different from the work hardening behavior in stage III between the ZXE0500 alloy and ZXE1500 alloy in three load directions because of the dynamic recovery. Tension twin is easier to be activated on ZXE1500 alloy rather than ZXE0500 alloy. Because the crack edge of samples used for the Erichsen test went through non-equal biaxial tensile stress, and the strain in the radial direction was much larger than that of the circumferential direction, so the texture evolution was similar to the uniaxial tensile stress.