The mechanical properties of magnesium alloy AZ31 were investigated experimentally with visco-plastic self-consistent modeling. Tension, compression and plane strain compression (PSC) tests were performed along 3 directions of a hot rolled plate, and the material parameters input in the model were fitted with the uniaxial stress-strain curves. The critical resolved shear stress (CRSS) for tension twinning was modeled with a modified Voce hardening law first decreasing, and then increasing with strain, that could reproduce better the flow stress for twin-predominant deformation. Such CRSS evolution may better model twin nucleation, propagation and growth. Firstly simulations were carried out assuming latent hardening coefficients for slip by other slip systems equal to self-hardening. Then different heterogeneous latent hardening were used, whose values were based on dislocation dynamics simulations from the literature. This study shows that equal self and latent hardening can reproduce the stress strain curves and plastic anisotropy as well as heterogeneous mode on mode latent hardening. Discrepancies between simulations and experimental results from PSC are explained by an under-estimation of twinning for some PSC strain paths.

采用粘塑性自洽模型对镁合金AZ31的力学性能进行了实验研究。沿热轧板的3个方向进行拉伸、压缩和平面应变压缩（PSC）试验，模型中输入的材料参数与单轴应力-应变曲线拟合。拉伸孪晶的临界分解剪切应力 (CRSS) 是用修改后的 Voce 硬化定律建模的，该定律首先随应变下降，然后随应变增加，这可以更好地再现孪晶主导变形的流变应力。这种 CRSS 演化可以更好地模拟双晶成核、传播和生长。首先进行模拟，假设其他滑移系统的滑移的潜在硬化系数等于自硬化。然后使用不同的异质潜硬化，其值基于文献中的位错动力学模拟。这项研究表明，相等的自硬化和潜硬化可以重现应力应变曲线和塑性各向异性以及异质模式的潜硬化。PSC 的模拟和实验结果之间的差异可以通过低估某些 PSC 应变路径的孪生来解释。