Formulating appropriate simulation models that capture the microstructure evolution at the mesoscale in metals undergoing thermomechanical treatments is a formidable task. In this work, an approach combining higher-order dislocation density based crystal plasticity with a phase-field model is used to predict microstructure evolution in deformed polycrystals. This approach allows to model the heterogeneous reorientation of the crystal lattice due to viscoplastic deformation and the reorientation due to migrating grain boundaries. The model is used to study the effect of strain localization in subgrain boundary formation and grain boundary migration due to stored dislocation densities. It is demonstrated that both these phenomena are inherently captured by the coupled approach.

中文翻译：

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扩散界面Cosserat方法预测的变形多晶的微观结构演变

制定适当的模拟模型以捕获进行热机械处理的金属的中尺度微观结构演变是一项艰巨的任务。在这项工作中，将基于高位错密度的晶体可塑性与相场模型相结合的方法可用于预测变形多晶的微观结构演变。这种方法可以对由于粘塑性变形引起的晶格异质重新定向和由于迁移的晶界引起的重新定向建模。该模型用于研究应变局部化在亚晶界形成和由于储存的位错密度引起的晶界迁移中的作用。事实证明，这两种现象都是通过耦合方法固有地捕获的。