研究了ＴｉＡｌ基合金中平衡态和热压力加工状态的α２／γ层片状晶团及其在α＋γ两相区加热时显微组织的热稳定性。试验结果表明，由于在层片状晶团内的相邻板条之间存在着一定的位向关系和有序γ相内原子扩散困难，致使新晶粒难以在晶团内形核，板条界面也难以进行迁移，从而阻碍板条向等轴状晶粒转变。所以，ＴｉＡｌ基合金α２／γ层片状晶团在α＋γ两相区加热时，表现出高的显微组织热稳定性。从而揭示了热处理细化ＴｉＡｌ基合金的必要条件 The α2 / γ lamellar lumps in the equilibrium and hot-pressed state of TiAl-based alloys were investigated and the thermal stability of the microstructures in the α + γ two-phase region was investigated. The experimental results show that due to the existence of a certain orientation relationship between the adjacent slats in the lamellar crystal lattice and the difficulty of atom diffusion in the ordered γ phase, new crystal grains are difficult to nucleate in the crystal lattice. The interface is also hard to migrate, hindering the slab from transitioning to equiaxed grains. Therefore, Ti-Al-based alloy α2 / γ lamellae are heated in α + γ two-phase zone, showing high thermal stability of the microstructure. Thus revealing the necessary conditions for heat treatment of refined Ti Al-based alloy