Ti-6Al-4V合金中α相颗粒溶解的相场模拟
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-01-17
通过相场方法定量模拟不同α初始颗粒尺寸分布(包括均匀、正态、对数正态以及双态分布)对Ti-6Al-4V 合金中α相颗粒溶解动力学的影响。方法中引入KKS 模型，从而避免界面能对化学自由能的依赖。
Ti-6Al-4V合金中α相颗粒溶解的相场模拟Simulation of dissolution of α particles in Ti-6Al-4V alloy by 3D phase field model通过相场方法定量模拟不同α初始颗粒尺寸分布(包括均匀、正态、对数正态以及双态分布)对Ti-6Al-4V 合金中α相颗粒溶解动力学的影响。方法中引入KKS 模型，从而避免界面能对化学自由能的依赖。结果发现：不同α初始颗粒尺寸分布下的α体积分数随时间的变化均符合衰减规律：f=fαexp(−Ktn)，而α相体积分数及颗粒平均半径随时间的演化关系强烈依赖于α颗粒的初始尺寸分布。4种分布状态下α相的溶解速度从快到慢依次为均匀分布、正态分布、对数正态分布和双态分布。在对数正态和双态分布下，颗粒半径的演化均随时间先减小再增加，最后一直递减，而对于均匀和正态分布则随时间呈单调递减趋势。
3D quantitative phase field method coupled with KKS model was applied to study the effect of initial particle size distribution (PSD) on dissolution of α phase in Ti-6Al-4V in real time and length scale. The results show that the volume fraction and average particle radius of α phase depend on the initial particle size distribution. The volume fraction of the α phase decays as f=fαexp(−Ktn). The sequence of dissolution kinetics for different distribution from fast to slow is uniform, normal, lognormal and bimodal. The average particle radius increases after an initial reduction, then decreases monotonously for log-normal and bimodal PSD, but it decreases monotonously with time for uniform and normal PSD.
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