在Gleeble-3500热模拟试验机上对粉末冶金TiAl合金进行热压缩试验,变形温度为1050 ～ 1200℃,,应变率0.001 ～0.1 s-1,工程应变量为50％,研究其在高温压缩变形中的流变应力行为.研究结果表明:在实验范围内,粉末冶金TiAl合金在热压缩变形过程中发生了明显的动态再结晶,其流变应力随应变速率的增大而增大,随变形温度的升高而降低;粉末冶金TiAl合金热压缩变形过程的流变行为可用包含Arrhenius项的Zener-Hollomon参数来描述,所获得的峰值应力表达式为:σ=90.91 In{(Z/1.68×1016)1/2.06+[(Z/1.68×1016)2/2.06+1]1/2},其变形激活能为477.56k J/mol,经验算该方程可以较好地描述该合金的变形特点.
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