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研究了铸造ＴｉＡｌ合金形成等轴的近Ｙ（ＮＧ）组织的热处理工艺及组织转变机理。（９００℃１２００℃）／６～１０次＋１１５０℃×９６ｈ＋ＦＣ热处理可使铸造Ｔｉ－４６．５Ａｌ－２．５Ｖ－１．０Ｃｒ（ａｔ％）合金粗大层片组织转变为细小均匀的等轴ＮＧ组织。在这种热处理过程中，层片组织中的ａ，片首先在循环热处理过程中通过溶解相变和Ｒａｙｌｅｉｇｈ扰动而间断，和层片再在略高于共析温度下发生由表面张力驱动的等轴化。
The heat treatment process and microstructure transformation mechanism of TiAl alloy in equiaxed near-Y (NG) structure were investigated. (900 ℃ 1200 ℃) / 6 ~ 10 times + 1150 ℃ × 96h + FC heat treatment can be cast Ti-46.5Al-2.5V-1.0Cr (at%) alloy coarse lamellar structure into fine uniform equiaxed NG organization . During this heat treatment, the a, sheet in the lamellar structure is first discontinuous by solution phase transformation and Rayleigh perturbation during the cyclic heat treatment, and the lamellae are then driven by surface tension at slightly above the eutectoid temperature Shafting.