Ti-6Al-4V合金β→α相变中晶界α相形成机制的相场模拟
收稿日期: 2019-11-18
修回日期: 2020-01-08
网络出版日期: 2020-04-08
基金资助
国家重点研发计划项目(2016YFB0701304);中国科学院战略性先导科技专项项目(XDC01040100);中国科学院信息化专项项目(XXH13506-304);国家自然科学基金项目(51671195)
Phase Field Modeling of Formation Mechanism of Grain Boundary Allotriomorph in β→α Phase Transformation in Ti-6Al-4V Alloy
Received date: 2019-11-18
Revised date: 2020-01-08
Online published: 2020-04-08
Supported by
National Key Research and Development Program of China(2016YFB0701304);Strategic Priority Research Program of Chinese Academy of Sciences(XDC01040100);Special Informatization Project of Chinese Academy of Sciences(XXH13506-304);National Natural Science Foundation of China(51671195)
使用相场模型研究了Ti-6Al-4V合金在β→α相变过程中晶界α相(αGB)的形核及晶界润湿生长过程。通过耦合Thermo-Calc热力学数据与相场模型模拟出的组织与实际形貌一致。结果表明，特殊构造的噪声项使β/β晶界处失稳，并促进α相在晶界上的形核。相变初期析出的α相颗粒较多的情况下生成的αGB形貌为连续的平滑状；反之，较少的α初始核会导致不连续αGB的生成，模拟结果揭示了实验中不同形貌αGB的形成机制。晶界润湿由不完全润湿到完全润湿可以是一个连续过程而不需其它反应即可实现。随噪声时间从50 s延长到80 s，αGB晶界润湿速率越来越快，且α相的体积分数逐渐增大；随噪声强度由0.05增大到0.11，反应速率也逐渐加快，而α相体积分数可能先增大后减小。噪声时间与强度对αGB形貌影响的规律与实验观察到的不同条件下的αGB形貌一致，可为晶界α相及合金的疲劳性能的控制提供信息。
孙佳 , 李学雄 , 张金虎 , 王刚 , 杨梅 , 王皞 , 徐东生 . Ti-6Al-4V合金β→α相变中晶界α相形成机制的相场模拟[J]. 金属学报, 2020 , 56(8) : 1113 -1122 . DOI: 10.11900/0412.1961.2019.00392
The microstructure evolution with grain boundary wetting phase transformation of α allotriomorph during the β→α phase transformation in Ti-6Al-4V alloy has been investigated by means of phase field modeling. A realistic microstructure was generated by coupling the Thermo-Calc thermodynamic parameters and phase field evolution equations. It is shown that the specially constructed thermal noise terms disturb the β/β interfaces and can produce heterogeneous nucleation of α phase at energetically favorable points such as triple junctions and β grain boundaries (GBs). A small amount of αGB (grain boundary α) nuclei formed at the early stage of phase transition would lead to the formation of discontinuous αGB; while a large number of αGB nuclei can result in the formation of continuous αGB. GBs can be "wetted" by a second solid phase through the reversible transition from incomplete to complete solid state wetting at a certain temperature without a new reaction. The volume fraction of α phase and the grain number increased gradually as the noise amplitude increased from 0.05 to 0.11, or noise duration from 50 s to 80 s. Both noise amplitude and time could control the formation kinetics of αGB, which will influence the microstructure, and the fatigue properties of Ti alloys can be altered if these are controlled experimentally.
Key words： Ti-6Al-4V; phase field model; thermal noise term; αGB; grain boundary wetting
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