β凝固钛铝合金是极富潜力的新型高温结构材料，在航空、航天、汽车等领域具有广阔的应用前景。 此类合金自熔融态凝固至室温过程中涉及复杂的相转变行为，直接影响其可加工性和服役性能。 本文介绍了 β 凝固钛铝合金的主要相变类型，包括 β→α、β→β0、α→α+γ→α2+γ 及 β0/α2→ω0 等。 基于合金元素、外加应力和冷却速率等因素作用机制的相关研究进展，阐述了各相变类型对合金微观组织和力学性能的影响，并对突破 β 凝固钛铝合金工业化应用所面临的挑战和相关基础问题进行了总结和展望。

β-solidifying titanium aluminium (TiAl) alloys are promising high-temperature structural materials and have great potentials in applications of the aviation, aerospace, and automobile industries. The phase transformation process of β-solidifying TiAl alloys from the molten state to room temperature is complex and directly affects their processability and performance. This article summarizes the major phase transformation types with respect to β-solidifying TiAl alloys, including β→α, β→β0, α→α+γ→α2+γ,and β0/α2→ω0.The effects of alloying elements, external stress and cooling rate on the microstructure and properties of β-solidifying TiAl alloys have been elaborated on the basis of the research progress of related mechanisms. The challenges and fundamental issues that need to be addressed for the industrial application of β-solidifying TiAl alloys are also discussed.