Phase-field modelling of rapid solidification of alloys

该项目旨在开发一个相场模型，用于模拟镍基合金在快速凝固过程中的凝固过程，就像添加剂制造过程中遇到的那样。现有的凝固相场模型是基于运动界面的局部平衡假设而建立的。这一近似值适用于普通的凝固方法，如布里奇曼工艺和型材铸造。然而，在添加剂制造过程中，观察到更高的冷却速度，导致偏离局部平衡。这通常被称为快速凝固。为了模拟添加剂制造过程中微观组织的形成，需要对现有相场模型进行相应的扩展。

The project aims at developing a phase-field model for simulating solidification of Ni-based alloys during rapid solidification, as encountered during additive manufacturing. Current phase-field models for solidification are based on the local equilibrium assumption to be valid at the moving interface. This approximation is working well for common solidification methods such as Bridgman processing and shape casting. During additive manufacturing however much higher cooling rates are observed, resulting in deviation from local equilibrium. This is commonly referred to as rapid solidification. In order to simulate microstructure formation during additive manufacturing, current phase-field models need to be extended accordingly.