Dargahi Noubary Kaveh, Kellner Michael, Nestler Britta
Institute for Applied Materials-Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131 Karlsruhe, Germany.
Institute of Digital Materials Science (IDM), Karlsruhe University of Applied Sciences, Willy-Andreas-Allee 19, 76131 Karlsruhe, Germany.
Materials (Basel). 2022 Feb 2;15(3):1160. doi: 10.3390/ma15031160.
For the first time, the experimental processing condition of a rotating directional solidification is simulated in this work, by means of a grand-potential-based phase-field model. To simulate the rotating directional solidification, a new simulation setup with a rotating temperature field is introduced. The newly developed configuration can be beneficent for a more precise study of the ongoing adjustment mechanisms during temperature gradient controlled solidification processes. Ad hoc, the solidification of the ternary eutectic system Bi-In-Sn with three distinct solid phases α,β,δ is studied in this paper. For this system, accurate in situ observations of both directional and rotating directional solidification experiments exist, which makes the system favorable for the investigation. The two-dimensional simulation studies are performed for both solidification processes, considering the reported 2D patterns in the steady state growth of the bulk samples. The desired αβαδ phase ordering repeat unit is obtained within both simulation types. By considering anisotropy of the interfacial energies, experimentally reported tilted lamellae with respect to normal vectors of the solidification front, as well as predominant role of αβ anisotropy in tilting phenomenon, are observed. The results are validated by using the Jackson-Hunt analysis and by comparing with the existing experimental data. The convincing agreements indicate the applicability of the introduced method.
在这项工作中，首次通过基于巨势的相场模型模拟了旋转定向凝固的实验处理条件。为了模拟旋转定向凝固，引入了一种具有旋转温度场的新模拟装置。新开发的配置有助于更精确地研究温度梯度控制凝固过程中的持续调整机制。特别地，本文研究了具有三个不同固相α、β、δ的三元共晶体系Bi-In-Sn的凝固。对于该体系，存在定向和旋转定向凝固实验的精确原位观测结果，这使得该体系有利于进行研究。考虑到块状样品稳态生长中报道的二维模式，对两种凝固过程都进行了二维模拟研究。在两种模拟类型中都获得了所需的αβαδ相序重复单元。通过考虑界面能的各向异性，观察到了实验报道的相对于凝固前沿法向量倾斜的片层，以及αβ各向异性在倾斜现象中的主要作用。通过使用杰克逊-亨特分析并与现有实验数据进行比较，验证了结果。令人信服的一致性表明了所引入方法的适用性。
