Crystal plasticity simulation is an important tool for advanced Integrated Computational Materials Engineering for metals and alloys. The current work presents a calibration and validation framework for crystal plasticity finite element (CPFE) simulation of extension twinning in the Mg alloy WE43 using the scanning electron microscopy with digital image correlation (SEM-DIC) technique. Rolled Mg alloy WE43 was subjected to in situ uniaxial compression along its rolling direction. Full-field displacement maps were captured using SEM-DIC during load pauses, and twin variant maps were obtained from the strain maps using post-processing analysis. CPFE was used to investigate the experimental results via a multi-scale twinning model developed for HCP polycrystals. In addition to macroscopic stress–strain curves, crystal plasticity parameters were calibrated using the variation of twin fraction area versus the applied strain obtained from the SEM-DIC results to accurately capture the twinning parameters. A new SEM-DIC pipeline was created for the open-source PRISMS-Plasticity CPFE software that can read in the precise deformation map generated by SEM-DIC as an input boundary condition for the finite element simulation and conduct the CPFE simulation. The performance of CPFE was evaluated versus the SEM-DIC obtained strain and twin maps. The results show that the CPFE can successfully model the macroscopic stress–strain response and the twin area fraction and that it can additionally capture microscale strain and twinning.

晶体塑性模拟是金属和合金高级集成计算材料工程的重要工具。目前的工作提出了一种校准和验证框架，用于使用具有数字图像相关 (SEM-DIC) 技术的扫描电子显微镜对 WE43 镁合金中的拉伸孪晶进行晶体塑性有限元 (CPFE) 模拟。轧制的 WE43 镁合金沿其轧制方向进行原位单轴压缩。在加载暂停期间使用 SEM-DIC 捕获全场位移图，并使用后处理分析从应变图中获得双变体图。CPFE 用于通过为 HCP 多晶开发的多尺度孪晶模型研究实验结果。除了宏观应力应变曲线，晶体塑性参数使用孪生分数面积的变化与从 SEM-DIC 结果获得的外加应变进行校准，以准确捕获孪晶参数。为开源 PRISMS-Plasticity CPFE 软件创建了一个新的 SEM-DIC 管道，可以读取 SEM-DIC 生成的精确变形图作为有限元模拟的输入边界条件并进行 CPFE 模拟。CPFE 的性能相对于 SEM-DIC 获得的应变和孪生图进行了评估。结果表明，CPFE 可以成功地模拟宏观应力应变响应和孪晶面积分数，并且它可以额外捕获微观应变和孪晶。