中国物理B ›› 2006, Vol. 15 ›› Issue (4): 778-791.doi: 10.1088/1009-1963/15/4/019

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Numerical simulation of dendrite growth and microsegregation formation of binary alloys during solidification process

李强1, 李荣德1, 郭巧懿2   

  1. (1)School of Material Science and Engineering, Shenyang University of Technology,Shenyang 110023, China; (2)Shenyang Ligong University, Shenyang 110168, China
  • 收稿日期:2005-11-08 修回日期:2005-12-28 出版日期:2006-04-20 发布日期:2006-04-20
  • 基金资助:
    Project supported by the Educational Department of Liaoning Province (Grant No 05L304).

Numerical simulation of dendrite growth and microsegregation formation of binary alloys during solidification process

Li Qiang (李强)a, Guo Qiao-Yi (郭巧懿)b, Li Rong-De (李荣德)a   

  1. a School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110023, China; b Shenyang Ligong University, Shenyang 110168, China
  • Received:2005-11-08 Revised:2005-12-28 Online:2006-04-20 Published:2006-04-20
  • Supported by:
    Project supported by the Educational Department of Liaoning Province (Grant No 05L304).

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摘要： The dendrite growth and solute microsegregation of Fe-C binary alloy are simulated during solidification process by using cellular automaton method. In the model the solid fraction is deduced from the relationship among the temperature, solute concentration and curvature of the solid/liquid interface unit, which can be expressed as a quadric equation, instead of assuming the interface position and calculating the solid fraction from the interface velocity. Then by using this model a dendrite with 0 and 45 degree of preferential growth direction are simulated respectively. Furthermore, a solidification microstructure and solute microsegregation are simulated by this method. Finally, different Gibbs-Thomson coefficient and liquid solute diffusing coefficient are adopted to investigate their influences on the morphology of dendrite.

关键词: dendrite, simulation, cellular automaton, solidification

Abstract: The dendrite growth and solute microsegregation of Fe-C binary alloy are simulated during solidification process by using cellular automaton method. In the model the solid fraction is deduced from the relationship among the temperature, solute concentration and curvature of the solid/liquid interface unit, which can be expressed as a quadric equation, instead of assuming the interface position and calculating the solid fraction from the interface velocity. Then by using this model a dendrite with 0 and 45 degree of preferential growth direction are simulated respectively. Furthermore, a solidification microstructure and solute microsegregation are simulated by this method. Finally, different Gibbs-Thomson coefficient and liquid solute diffusing coefficient are adopted to investigate their influences on the morphology of dendrite.

Key words: dendrite, simulation, cellular automaton, solidification

中图分类号:  (Whiskers and dendrites (growth, structure, and nonelectronic properties))

  • 68.70.+w
64.70.D- (Solid-liquid transitions) 64.75.-g (Phase equilibria) 68.08.De (Liquid-solid interface structure: measurements and simulations) 81.30.Fb (Solidification)