中文摘要：

在Gleeble-3500型热模拟试验机上研究了TiAl合金在变形温度为1 2731 423K和应变速率为0.0011s-1条件下的热变形行为。采用多元线性回归拟合材料常数与应变的函数关系,构建了基于应变量耦合的本构方程。结果表明,以应变的6次多项式拟合得到的本构模型能较好预测真应力-应变曲线,且相对误差在5%以内。

英文摘要：

The hot deformation behavior of TiAl alloy was analyzed on a Gleeble-3500 thermal mechanical simulator at various temperatures（1 2731 423K）and strain rates（0.0011s-1）.Constitutive equation based on introducing the strain was established by using multiple linear regression for material constant and true strain relationship.The results reveal that the presented model with six order polynomial fitting can better predict the experimental data on the true stress-strain curve,and relative error is less than 5%.