中国物理B ›› 2006, Vol. 15 ›› Issue (1): 219-223.doi: 10.1088/1009-1963/15/1/036

• 8000 CROSSDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Anisotropic growth of multigrain in equiaxial solidification simulated with the phase field method

李梅娥1, 肖志英1, 杨根仓2, 周尧和2   

  1. (1)School of Material Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China; (2)State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2005-04-13 修回日期:2005-05-24 出版日期:2006-01-20 发布日期:2006-01-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 50395103 and 50271057).

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   

  1. 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
  • Received:2005-04-13 Revised:2005-05-24 Online:2006-01-20 Published:2006-01-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 50395103 and 50271057).

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摘要： 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.

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.

Key words: multigrain, solidification, transformation kinetics, phase field method

中图分类号:  (Solidification)

  • 81.30.Fb
61.50.-f (Structure of bulk crystals) 65.40.G- (Other thermodynamical quantities)