Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys

doi:10.1088/1674-1056/19/7/078101

中国物理B ›› 2010, Vol. 19 ›› Issue (7): 78101-078101.doi: 10.1088/1674-1056/19/7/078101

Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys

王志军, 王锦程, 杨根仓

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

收稿日期:2009-10-23 出版日期:2010-07-15 发布日期:2010-07-15
基金资助:
Project supported by the fund of the State Key Laboratory of Solidification Processing in NWPU, China (Grants Nos. 17-TZ-2007, 03-TP-2008, and 24-TZ-2009) and the Doctorate Foundation of Northwestern Polytechnical University.

Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys

Wang Zhi-Jun(王志军), Wang Jin-Cheng(王锦程)^†, and Yang Gen-Cang(杨根仓)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

Received:2009-10-23 Online:2010-07-15 Published:2010-07-15
Supported by:
Project supported by the fund of the State Key Laboratory of Solidification Processing in NWPU, China (Grants Nos. 17-TZ-2007, 03-TP-2008, and 24-TZ-2009) and the Doctorate Foundation of Northwestern Polytechnical University.

摘要/Abstract

摘要： All the quantitative phase field models try to get rid of the artificial factors of solutal drag, interface diffusion and interface stretch in the diffuse interface. These artificial non-equilibrium effects due to the introducing of diffuse interface are analysed based on the thermodynamic status across the diffuse interface in the quantitative phase field model of binary alloys. Results indicate that the non-equilibrium effects are related to the negative driving force in the local region of solid side across the diffuse interface. The negative driving force results from the fact that the phase field model is derived from equilibrium condition but used to simulate the non-equilibrium solidification process. The interface thickness dependence of the non-equilibrium effects and its restriction on the large scale simulation are also discussed.

Abstract: All the quantitative phase field models try to get rid of the artificial factors of solutal drag, interface diffusion and interface stretch in the diffuse interface. These artificial non-equilibrium effects due to the introducing of diffuse interface are analysed based on the thermodynamic status across the diffuse interface in the quantitative phase field model of binary alloys. Results indicate that the non-equilibrium effects are related to the negative driving force in the local region of solid side across the diffuse interface. The negative driving force results from the fact that the phase field model is derived from equilibrium condition but used to simulate the non-equilibrium solidification process. The interface thickness dependence of the non-equilibrium effects and its restriction on the large scale simulation are also discussed.

Key words: phase field model, solidification, diffuse interface

中图分类号: (Diffusion; interface formation)

68.35.Fx

65.40.-b (Thermal properties of crystalline solids) 64.70.D- (Solid-liquid transitions)

王志军, 王锦程, 杨根仓. Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys[J]. 中国物理B, 2010, 19(7): 78101-078101.

Wang Zhi-Jun(王志军), Wang Jin-Cheng(王锦程), and Yang Gen-Cang(杨根仓). Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys[J]. Chin. Phys. B, 2010, 19(7): 78101-078101.

参考文献 15

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Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys

Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys

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