讨论了经过不同冷却速率、加热温度和保温时间对新型TiAl合金的γ/α2层片组织的影响。结果表明:热处理时间增加,层片晶团的晶粒有长大趋势,片层组织中出现层错,位错等缺陷;在不同冷却方式中,油冷组织中出现了块状γ,炉冷组织具有密集的层片。热处理温度在Tα相变点以上20℃内,片层晶团的晶粒最小,这是由合金中的弱β稳定元素Ta造成的。 The effect of different cooling rates, heating temperature and holding time on the microstructure of γ / α2 lamellar TiAl alloy was discussed. The results show that when the heat treatment time increases, the grain size of the crystal grains in the lamellae grows up, and faults such as stacking faults and dislocations appear in the lamellar structure. In different cooling modes, massive γ, Tissue has a dense ply. The temperature of the heat treatment is within 20 ° C above the Tα transformation point, and the grain size of the lamellar layer is the smallest, which is caused by the weak β-stable element Ta in the alloy.