Anisotropic growth of multigrain in equiaxial solidification simulated with the phase field method
Li Mei-E (李梅娥)a, Xiao Zhi-Ying (肖志英)a, Yang Gen-Cang (杨根仓)b, Zhou Yao-He (周尧和)b
a School of Material Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China; b State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Abstract The phase field method has been mainly used to simulate the growth of a single crystal in the past. But polycrystalline materials predominate in engineering. In this work, a phase field model for multigrain solidification is developed, which takes into account the random crystallographic orientations of crystallites and preserves the rotational invariance of the free energy. The morphological evolution of equiaxial multigrain solidification is predicted and the effect of composition on transformation kinetics is studied. The numerical results indicate that due to the soft impingement of grains the Avrami exponent varies with the initial melt composition and the solidification fraction.
Received: 13 April 2005
Revised: 24 May 2005
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 50395103 and 50271057).
Cite this article:
Li Mei-E (李梅娥), Xiao Zhi-Ying (肖志英), Yang Gen-Cang (杨根仓), Zhou Yao-He (周尧和) Anisotropic growth of multigrain in equiaxial solidification simulated with the phase field method 2006 Chinese Physics 15 219
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