针对材料的热变形,基于常见的指数方程,通过对相关表达式的具体推导,构建了一种可以较为有效地描述应变、应变速率和温度对流动应力影响的本构模型。将模型用于预测纯铝的热变形流变行为,得到的预测曲线和实验曲线吻合较好。结果表明,所建本构模型有效,构建方法合理,能够有效预测该材料在热变形中的流动应力。 Aiming at the thermal deformation of materials, a constitutive model that can describe the effects of strain, strain rate and temperature on the flow stress effectively is constructed based on the common exponential equation. The model is used to predict the hot deformation rheological behavior of pure aluminum. The predicted curve is in good agreement with the experimental curve. The results show that the proposed constitutive model is effective and its construction method is reasonable, which can effectively predict the flow stress of the material in thermal deformation.