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在Gleeble-3500型热模拟试验机上研究了TiAl合金在变形温度为1 273~1 423K和应变速率为0.001~1s~(-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。
The thermal deformation behavior of TiAl alloy under the deformation temperature of 1 273 ~ 1 423K and strain rate of 0.001 ~ 1s ~ (-1) was studied on a Gleeble-3500 thermal simulator. The constitutive equation based on strain-quantity coupling was constructed by using the multiple linear regression to fit the function of material constant and strain. The results show that the constitutive model obtained by the 6th order polynomial fitting of strain can predict the true stress-strain curve well, and the relative error is within 5%.