通过等温压缩特性及微观组织演变研究,提出了有效的γ-TiAl基合金晶粒细化方法。研究发现,如果γ-TiAl合金锭具有一定的细晶组织便可以在(α2+γ)2相区完成等温变形而不产生裂纹。动态再结晶和静态球化数量的增加是提高γ-TiAl合金变形能力的主要原因。将等温变形的模拟锻件在不同相区进行热处理获得了具有细小尺寸的3种(全片层、近片层和双态)组织。 Based on the study of isothermal compression characteristics and microstructure evolution, an effective method of grain refinement of γ-TiAl-based alloy is proposed. It has been found that if the γ-TiAl alloy ingot has some fine grain structure, the isothermal deformation can be completed in the (α2 + γ) 2 phase region without cracking. The main reason for increasing the deformation capacity of γ-TiAl alloy is the increase of the number of dynamic recrystallization and static spheroidization. The isothermal deformation of the simulated forgings in different phase heat treatment to obtain a small size of the three kinds of (whole plate, near layer and bimodal) organizations.