在应变速率0.001~1 s-1、温度573~823 K的条件下,采用Gleeble 3500热模拟试验机对Al-14Cu-7Ce合金进行等温热压缩实验,并根据真应力-真应变的计算数值,建立了Al-14Cu-7Ce合金高温流变应力本构方程。结果表明,流变应力符合速率方程€=ADLGb/kT(sinhaLG)n;其中,应变的影响通过多项式拟合方式耦合进入材料常数A,αL和n。所建立的本构方程能够准确预测Al-14Cu-7Ce合金高温流变应力,实验条件下控制合金热变形的主要机制是位错攀移。 Under the conditions of strain rate 0.001 ~ 1 s-1 and temperature 573 ~ 823 K, the Gleeble 3500 thermal simulator was used to simulate the isothermal compression of Al-14Cu-7Ce alloy. Based on the true stress-true strain , Established the flow stress constitutive equation of Al-14Cu-7Ce alloy at high temperature. The results show that the flow stress is in accordance with the rate equation: = ADLGb / kT (sinhaLG) n, where the influence of strain is coupled into the material constants A, αL and n through polynomial fitting. The established constitutive equation can accurately predict the high temperature flow stress of Al-14Cu-7Ce alloy. The main mechanism of controlling the alloy thermal deformation under the experimental conditions is dislocation climbing.