γ-TiAl合金显微组织高温演变行为研究进展-中国材料进展

文章信息/Info

Title:: Research Progress on the Evolution Behavior of γ-TiAl Alloys Microstructure at Elevated Temperature

Author(s):: LI Xiaobing; HAO Junjie; CHEN Bo; XUE Peng; LIU Kui; Ji Hua Laboratory, Foshan 528200, China

Keywords:: TiAl alloys; βo/B2; microstructure; stability; phase transformation; tailoring

摘要:: γ-TiAl合金是一类金属间化合物(简称TiAl合金)，具有低密度、高比强、良好抗氧化和耐磨性的特点，在航空航天、车辆交通、低空经济等战略新兴产业领域具有广阔的应用前景。目前TiAl合金已相继在航空发动机、内燃机等动力系统中得到应用。作为一种高温用结构材料，有必要全面深入掌握TiAl合金显微组织近服役条件下的演变行为。全面总结归纳了传统γ-TiAl合金和β凝固γ-TiAl合金显微组织高温转变类型与特点，并对两类合金显微组织高温转变行为差异作了深入对比与分析，结合团队近年的研究成果综述了典型相、组织的高温转变机理、影响因素与调控方法。展望了TiAl合金显微组织高温演变方面今后应进一步深入开展的研究方向，以期为高承温TiAl合金的组织、成分设计与应用提供一定的参考。

Abstract:: γ-TiAl alloys, a type of intermetallic compound (commonly referred as TiAl alloys), are characterized by low density, high specific strength, and excellent oxidation and wear resistance. These properties make them highly promising for applications in strategic emerging industries such as aerospace, automotive, and low-altitude economy. Currently, TiAl alloys have been successfully applied in power systems, including aerospace engines and internal combustion engines. As a high-temperature structural material, it is essential to comprehensively understand the microstructure evolution of TiAl alloys under near-service conditions. This paper provides a comprehensive summary of the high-temperature phase transformations and characteristics of conventional γTiAl alloys and β-solidified γ-TiAl alloys. It also offers an in-depth comparison and analysis of the differences in the high-temperature transformation behaviors between the two alloy types. The mechanisms, influencing factors, and regulation methods of typical phase and microstructural transformations at high temperatures are reviewed combining the research achievements of our team in recent years. The paper concludes by outlining potential future research directions for the high-temperature microstructure evolution and behavior of these TiAl alloys, with the aim of providing valuable insights for the microstructure and composition design, and the application of hightemperature-resistant TiAl alloys.