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采用高温等温压缩试验并利用修正后的流变曲线,研究了2099 Al-Li合金在变形温度为300~500℃,应变速率为0.001~10 s-1,变形量(真应变)为0.7条件下的流变行为。结果表明:可用包含Z参数的双曲正弦形式来表征变形温度和应变速率对2099 Al-Li合金热变形行为的影响;将应变作为影响因素,求解了不同应变量下的材料常数,并构建了考虑应变的本构模型;统计分析结果表明,除了在变形温度为300℃,应变速率为10 s-1之外,该模型能够很好的预测2099 Al-Li合金高温流变行为。
Using the isothermal compression test at high temperature and using the modified rheological curve, the effects of deformation temperature (300 ~ 500 ℃), strain rate of 0.001 ~ 10 s-1 and deformation amount (true strain) The rheological behavior. The results show that the influence of deformation temperature and strain rate on the hot deformation behavior of 2099 Al-Li alloy can be characterized by the hyperbolic sine model with Z parameter. The strain constant is taken as the influencing factor to solve the material constants under different strain quantities. Considering the constitutive model of strain, the results of statistical analysis show that the model can predict the rheological behavior of 2099 Al-Li alloy at high temperature except for the deformation temperature of 300 ℃ and the strain rate of 10 s-1.