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刘涛,杨梅,王璐,王刚,徐东生.晶界扩散对Ti-6Al-4V中α 相溶解的相场模拟[J].稀有金属材料与工程(英文),2019,48(9):2864~2872.[Liu Tao,Yang Mei,Wang Lu,Wang Gang and Xu Dongsheng.The Phase Field Simulation of Effect of Grain Boundary Diffusion on α Phase Dissolution[J].Rare Metal Materials and Engineering,2019,48(9):2864~2872.]
The Phase Field Simulation of Effect of Grain Boundary Diffusion on α Phase Dissolution
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Received:October 30, 2018  Revised:January 24, 2019
Key words: grain boundary diffusion  phase field model  dissolution  the spatial distribution of phase  phase size distribution ________________________
Foundation item:国家自然科学基金资助(项目号51601078),国家科技攻关项目资助(项目号 2016YFB0701302),江苏省自然科学资助 (项目号 BK20181047)
Author NameAffiliation
Liu Tao,Yang Mei,Wang Lu,Wang Gang and Xu Dongsheng  
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      The grain boundaries as a fast diffusion path for solutes play an important role in multi-component diffusion-controlled phase transformations. In order to study the phase transformations in consideration of the grain boundary diffusion, the diffusion along grain boundary is incorporated in the quantitative phase field model coupled with the Kim-Kim-Suzuki (KKS). An integration method was used to calculate the equivalent grain boundary diffusion in the phase field method. The thermodynamic and mobility data was obtained from Thermo-Calc and DICTRA software respectively. The effect of the number of grain boundaries, the spatial distribution and size distribution (PSD) of α phase on the α phase dissolution was researched in the paper. The results show that grain boundaries are a faster element diffusive path. The number of grain boundaries is larger, the kinetics of α phase dissolution is faster. Namely, the kinetics of α phase dissolution is fastest when phase located at triple junctions; However, the dissolution kinetics is little difference when α phase is on the grain boundary and distribute uniformly in the matrix. Compared to the phase dissolution rate in two-dimensional condition, the effect of the grain boundary diffusion on dissolution kinetics is more obvious in three-dimensional condition. When phase transformation is dominated by bulk diffusion of solute, the spatial distribution of α phase is a main factor affecting the α phase dissolution. But when phase transformation is dominated by grain boundary diffusion of solute, the effects of other size distributions on the dissolution of alpha phase are not obvious except for uniform PSD.