三元合金中界面迁移率的相场法计算

摘要

基于定量相场模型,提出一种新方法来计算界面迁移率,并将该方法应用于Ti-6A1-4V合金的α/β界面.相场模拟表明,更高的界面迁移率将导致更快的相转变速率,但在扩散控制的条件下,只有唯一的界面迁移率能匹配扩散方程.通过比较采用相场模拟和经典扩散方程所得到的相变动力学,可以得到不同温度下的界面迁移率.结果表明,计算所得的界面迁移率随着温度的升高而增加,且与Arrhenius方程吻合得很好.%A novel approach based on the quantitative phase field model was proposed to calculate the interface mobility and applied to the α/β interface of a ternary Ti-6Al-4V alloy.Phase field simulations indicate that the higher interface mobility leads to the faster transformation rate,but only a unique value of interface mobility matches the diffusion equation under the diffusion-controlled condition.By comparing the transformation kinetics from phase field simulations with that from classical diffusion equation,the interface mobility at different temperatures can be obtained.The results show that the calculated interface mobility increases with increasing temperature and accords with Arrhenius equation very well.