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

• Published in: Chinese physics B Vol. 19; no. 7; pp. 590 - 595
• Main Author: 王志军 王锦程 杨根仓
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2010
• Subjects: Binary alloys; Computer simulation; Diffusion; Diffusion effects; Driving conditions; Equilibrium conditions; Mathematical models; Solidification; 二元合金; 人为因素; 局部区域; 平衡状态; 热力学状态; 界面扩散; 相场模型; 非平衡效应
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/7/078101

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.