Phase field simulation for non-isothermal solidification of multicomponent alloys coupled with thermodynamics database

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• 作者：Shu-zhou ZHANG ; Rui-jie ZHANG ; Xuan-hui QU ; Wei FANG ; Ming-zhi LIU
• 关键词：phase-field ; multicomponent alloys ; coupling ; thermodynamics ; non-isothermal solidification ; simulation
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：23
• 期：8
• 页码：2361-2367
• 全文大小：1679 K

文摘

In order to quantitively model the real solidification process of industrial multicomponent alloys, a non-isothermal phase field model was studied for multicomponent alloy fully coupled with thermodynamic and diffusion mobility database, which can accurately predict the phase equilibrium, solute diffusion coefficients, specific heat capacity and latent heat release in the whole system. The results show that these parameters are not constants and their values depend on local concentration and temperature. Quantitative simulation of solidification in multicomponent alloys is almost impossible without such parameters available. In this model, the interfacial region is assumed to be a mixture of solid and liquid with the same chemical potentials, but with different composition. The anti-trapping current is also considered in the model. And this model was successfully applied to industrial Al-Cu-Mg alloy for the free equiaxed dendrite solidification process.