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.

Graphic Abstract

摘要

对不同应力状态下的不同变形行为进行了单轴拉伸试验和埃里克森试验。由于沿横向的双峰织构，本文所用的材料在轧制平面上具有明显的各向异性。然而，具有最弱织构分布的Mg合金没有获得更好的可塑性和可成形性，这与通过添加更多的Zn增强的晶界内聚力有关。对于给定的Mg合金，位错存储的速率与载荷方向无关，即使Mg合金在较低应力水平下具有较大的面内各向异性。由于动态恢复，ZXE0500合金和ZXE1500合金在三个载荷方向上的第三阶段加工硬化行为有所不同。在ZXE1500合金上比在ZXE0500合金上更容易激活张力孪晶。因为用于Erichsen测试的样品的裂纹边缘经历了不等的双轴拉伸应力，并且径向方向的应变远大于周向方向的应变，所以织构的演化类似于单轴拉伸应力。

图形摘要