采用Gleeble-1500试验机对经过挤压比为12开坯后的γ-TiAl合金在温度为900～1100℃、应变速率为0.01～1s<'-1>、变形量为70%等温恒应变速率下的热变形行为进行了研究,获得了变形条件范围内的流变应力数据,并利用Ze-ner-Hollomn参数和Arrhenius方程得出γ-TiAl合金的本构方程.结果表明:γ-TiAl合金在900℃,应变速率为1s<'-1>和0.1s<'-1>的条件下新生动态再结晶品粒较少,并且动态再结晶发生的热力学条件比一般高温合金更加苛刻.所获得的流变应力方程为σ=48.1(1nε+413.53×10<'3>/RT-28.37);其热变形激活能Q=413.53kJ/mol,为科学设计和有效控制γ-TiAl合金的锻造工艺提供了理论依据.
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