中国物理B ›› 2008, Vol. 17 ›› Issue (3): 1078-1083.doi: 10.1088/1674-1056/17/3/054

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Phase-field simulation of dendritic growth in a binary alloy with thermodynamics data

龙文元, 夏春, 熊博文, 方立高   

  1. College of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
  • 收稿日期:2007-02-05 修回日期:2007-09-20 出版日期:2008-03-04 发布日期:2008-03-04
  • 基金资助:
    Project supported by Research Center of Material Science and Engineering of Jiangxi Province, China (Grant No ZX200301017).

Phase-field simulation of dendritic growth in a binary alloy with thermodynamics data

Long Wen-Yuan(龙文元), Xia Chun(夏春), Xiong Bo-Wen(熊博文), and Fang Li-Gao(方立高)   

  1. College of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
  • Received:2007-02-05 Revised:2007-09-20 Online:2008-03-04 Published:2008-03-04
  • Supported by:
    Project supported by Research Center of Material Science and Engineering of Jiangxi Province, China (Grant No ZX200301017).

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摘要： This paper simulates the dendrite growth process during non-isothermal solidification in the Al--Cu binary alloy by using the phase-field model. The heat transfer equation is solved simultaneously. The thermodynamic and kinetic parameters are directly obtained from existing database by using the Calculation of Phase Diagram (CALPHAD) method. The effects of the latent heat and undercooling on the dendrite growth, solute and temperature profile during the solidification of binary alloy are investigated. The results indicate that the dendrite growing morphologies could be simulated realistically by linking the phase-field method to CALPHAD. The secondary arms of solidification dendritic are better developed with the increase of undercooling. Correspondingly, the tip speed and the solute segregation in solid--liquid interface increase, but the tip radius decreases.

Abstract: This paper simulates the dendrite growth process during non-isothermal solidification in the Al--Cu binary alloy by using the phase-field model. The heat transfer equation is solved simultaneously. The thermodynamic and kinetic parameters are directly obtained from existing database by using the Calculation of Phase Diagram (CALPHAD) method. The effects of the latent heat and undercooling on the dendrite growth, solute and temperature profile during the solidification of binary alloy are investigated. The results indicate that the dendrite growing morphologies could be simulated realistically by linking the phase-field method to CALPHAD. The secondary arms of solidification dendritic are better developed with the increase of undercooling. Correspondingly, the tip speed and the solute segregation in solid--liquid interface increase, but the tip radius decreases.

Key words: phase-field model, dendritic growth, CALPHAD, binary alloy

中图分类号:  (Solidification)

  • 81.30.Fb
64.70.D- (Solid-liquid transitions) 65.40.G- (Other thermodynamical quantities) 68.70.+w (Whiskers and dendrites (growth, structure, and nonelectronic properties)) 81.30.Bx (Phase diagrams of metals, alloys, and oxides)