Multiscale mechanical behavior and microstructure evolution of extruded magnesium alloy sheets: Experimental and crystal plasticity analysis-猫眼课题宝

挤压镁合金板的多尺度力学行为和微观结构演化：实验和晶体塑性分析

DOI：

10.1016/j.matchar.2017.11.034

发表时间：

2018

期刊：

Materials Characterization

影响因子：

4.7

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

Xi Baili;Fang Gang;Xu Shiwei

采用基于Voronoi晶粒的唯象晶体塑性有限元（CPFE）模型，模拟了热挤压镁合金板材在不同应变路径下的基本变形特征。相应的实验研究，包括力学测试，电子背散射衍射（EBSD）测量和光学观察，也进行了验证或补充的数值结果。预测的平均应力-应变响应和织构演化与实测结果吻合较好。基于该模型，研究了细观和粒间尺度下的变形不均匀性。在中尺度下，滑移主导的非均匀性倾向于持续发展，而孪晶有利的非均匀性则受到阻碍。在晶间尺度上，它是从滑移为主的情况下，一个高的滑移传递参数和高施密特因子（SFs）的主滑移系统在相邻的晶粒可以容纳更高的局部应变。

A phenomenological crystal plasticity finite element (CPFE) model based on Voronoi grains was applied to reproduce basic deformation features of a hot-extruded magnesium alloy sheet under various strain paths. Corresponding experimental investigations, including mechanical tests, electron back scattered diffraction (EBSD) measurements and optical observation, were also carried out as either a validation or a supplement of the numerical results. Predicted average stress-strain responses and texture evolution are in good accordance with measured ones. Furthermore, deformation heterogeneity at the mesoscopic and intergranular scale were investigated based on the proposed model. At the mesoscale, the heterogeneity in the slip-dominated cases tends to develop continuously, whereas the heterogeneity is retarded in twin-favored deformation. At the intergranular scale, it is concluded from the slip-dominated case that a high slip-transfer parameter and high Schmid factors (SFs) of principal slip systems in adjacent grains could accommodate higher local strain.