Abstract In the context of hot tearing susceptibility, the semi-solid constitutive behaviour of two commercially important foundry aluminum alloys at high solid fraction has been simulated. The numerical methodology combines solid mechanics, computational fluid dynamics, and microstructure modelling, i.e a meso-scale multi-physics approach. Feedable and un-feedable domains with different microstructures including equiaxed globular, equiaxed dendritic, and combined dendritic and eutectic were developed. Considering that it is the combined effects of a lack of liquid feeding and limited semi-solid ductility that contribute to hot tearing formation, the effect of feeding and mechanical deformation are studied and discussed. The model demonstrates that the microstructure type and the eutectic formation also have a considerable effect on the liquid channels pressure drop and semi-solid bulk stress and strain, and consequently on hot tearing.

中文翻译：

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铸造铝合金半固态变形的细观模型：进料和微观结构对热撕裂敏感性的影响

摘要 在热裂敏感性的背景下，模拟了两种具有重要商业价值的铸造铝合金在高固含量下的半固态本构行为。数值方法结合了固体力学、计算流体动力学和微观结构建模，即一种中尺度多物理场方法。开发了具有不同微观结构的可进料和不可进料域，包括等轴球状、等轴枝晶、以及组合的枝晶和共晶。考虑到缺乏液体进料和有限的半固体延展性的综合影响导致了热撕裂的形成，研究和讨论了进料和机械变形的影响。