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研究一种多元合金的非等温相场模型,定量地模拟工业多元合金的真实凝固过程,结合热力学和扩散迁移率的数据来预测整个系统中的相平衡、溶质扩散系数、比热容和放出的潜热。结果表明:这些参数不是常数,它们的值与成分和温度有关。没有这些参数,定量模拟多元合金的凝固几乎是不可能。在这个模型中,界面区域假设是由有同样化学势的固相和液相混合而成的,但组成不同。这个模型中同样考虑反溶质截流。一并将模型应用到工业Al-Cu-Mg合金的各向枝晶自由长大的凝固过程。
A non-isothermal phase field model of multivariate alloy is studied to quantitatively simulate the real solidification process of industrial multicomponent alloys. The phase equilibrium, solute diffusion coefficient, specific heat capacity and latent heat released are predicted by thermodynamic and diffusion mobility data. The results show that these parameters are not constants and their values are related to composition and temperature. Without these parameters, it is almost impossible to quantitatively simulate the solidification of multiple alloys. In this model, the interfacial region is assumed to be composed of a mixture of solid and liquid phases of the same chemical potential, but of a different composition. Anti-solute shutoff is also considered in this model. The model was also applied to the free-growth solidification of the various dendrites in industrial Al-Cu-Mg alloys.