TiAl基合金片层结构不连续粗化行为的研究进展

Research Progress of Lamellar Structure Discontinuous Coarsening Behavior in TiAl Based Alloy

摘要:

TiAl合金由于其优异的比强度、比刚度、耐蚀性和抗氧化性，在高温结构材料领域有着良好的应用前景。片层结构是TiAl合金重要的微观结构形态，其不连续粗化行为直接影响合金的综合性能。本文介绍了TiAl合金片层结构的粗化类型，分析了不连续粗化的热力学及动力学，综述了近年来TiAl合金片层结构不连续粗化行为的研究进展，总结了化学成分及含量、微观组织特征、热处理工艺（如循环热处理周期、温度、时间、冷却速率等）、增材制造技术及应力等因素对不连续粗化的影响，展望了未来TiAl合金片层结构的设计与优化的发展方向。

Abstract:

TiAl alloys have a good application prospect in the field of high temperature structural materials due to their excellent specific strength, specific stiffness, corrosion resistance and oxidation resistance. The lamellar structure is an important microstructure of TiAl alloy, and its discontinuous coarsening behavior directly affects the comprehensive properties of the alloy. In this paper, the coarsening types of TiAl alloy lamellar structure are introduced, and the thermodynamics and kinetics of discontinuous coarsening are analyzed. Besides, the research progress of discontinuous coarsening behavior of TiAl alloys lamellar structure in recent years is reviewed. The effects of chemical composition and content, microstructure characteristics, heat treatment process (such as cyclic heat treatment cycle, temperature, time, cooling rate, etc.), additive manufacturing technology and stress on discontinuous coarsening are summarized. Finally, the future development direction of TiAl alloy lamellar structure design and optimization is prospected.