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Modeling the strongly localized deformation behavior in a magnesium alloy with complicated texture distribution

机译：模拟具有复杂纹理分布的镁合金中的强局部变形行为

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摘要

A crystal plasticity finite element model (CPFEM) was developed to simulate the bending behaviors of a friction stir welded (FSW) Mg joint. The joint was divided into 12 sub-regions in the model to represent the observed complicated texture distributions. Twinning was modeled as pseudo slip and the predominant twin reorientation scheme was used. Two kinds of three-point bending geometries were applied. The present study aims to understand the underlying mechanisms of the strain heterogeneity and fracture localization commonly occurred in FSW Mg joints during bending deformation. It reveals that the strongly localized texture in conjunction with the different activities of slip and twinning in each sub-region cause severe strain heterogeneity in welding direction (WD), which results in the "concave-convex" appearance as observed on the longitudinal section. Besides, fracture initiates from the outer edge of thermomechanical affected zone (TMAZ) during Surface test due to the highly localized activation of basal slip, and crack likely propagates into the region of easy to activate basal slip (EARS) in a later stage. Crack initiates in crown zone (CZ)-side during Base test with a small distance away from the TMAZ/CZ interface. The huge differences in the activities of slip and twinning modes in each sub-region cause deformation incompatibility in the FSW Mg joint and initiates fracture in the area with maximum strain.
机译：建立了晶体可塑性有限元模型（CPFEM），以模拟搅拌摩擦焊接（FSW）镁合金接头的弯曲行为。在模型中将关节分为12个子区域，以表示观察到的复杂纹理分布。孪生被建模为伪滑移，并使用了主要的孪生重取向方案。应用了两种三点弯曲几何形状。本研究旨在了解在弯曲变形过程中，FSW Mg接头中普遍发生的应变异质性和断裂局部化的潜在机理。它揭示了在每个子区域中，强烈局部化的纹理以及滑动和孪生的不同活动会导致焊接方向（WD）上的严重应变异质性，从而导致在纵向截面上观察到“凹凸”外观。此外，由于基层滑移的高度局部活化，在表面测试期间，裂缝从热机械影响区（TMAZ）的外缘开始，并且裂缝可能在稍后阶段传播到易于激活的基层滑移（EARS）区域。在基础测试过程中，在距TMAZ / CZ接口一小段距离的地方，裂纹在胎冠区（CZ）侧产生。每个子区域中滑动和孪生模式活动的巨大差异导致FSW Mg接头变形不相容，并在最大应变区域引发断裂。

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