Ti-6Al-4V合金中α相顆粒溶解的相場模擬
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-17
通過相場方法定量模擬不同α初始顆粒尺寸分布(包括均勻、正態、對數正態以及雙態分布)對Ti-6Al-4V 合金中α相顆粒溶解動力學的影響。方法中引入KKS 模型，從而避免界面能對化學自由能的依賴。
Ti-6Al-4V合金中α相顆粒溶解的相場模擬Simulation of dissolution of α particles in Ti-6Al-4V alloy by?3D phase field model通過相場方法定量模擬不同α初始顆粒尺寸分布(包括均勻、正態、對數正態以及雙態分布)對Ti-6Al-4V 合金中α相顆粒溶解動力學的影響。方法中引入KKS 模型，從而避免界面能對化學自由能的依賴。結果發現：不同α初始顆粒尺寸分布下的α體積分數隨時間的變化均符合衰減規律：f=fαexp(?Ktn)，而α相體積分數及顆粒平均半徑隨時間的演化關系強烈依賴于α顆粒的初始尺寸分布。4種分布狀態下α相的溶解速度從快到慢依次為均勻分布、正態分布、對數正態分布和雙態分布。在對數正態和雙態分布下，顆粒半徑的演化均隨時間先減小再增加，最后一直遞減，而對于均勻和正態分布則隨時間呈單調遞減趨勢。
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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