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通过在Gleeble-1500热模拟试验机上进行高温压缩试验,研究了7A85铝合金在变形温度为250～450℃、应变速率为0.001～1 s-1条件下的高温流变行为。研究表明,7A85铝合金在热压缩过程中发生了明显的动态回复与动态再结晶;变形抗力随温度的降低而增加,当温度低于300℃时变形抗力增加明显,同时变形抗力随应变速率的增大而增大;应变速率和流变应力之间满足指数关系,温度和流变应力之间满足Arrhenius方程;采用线性回归方法获得了7A85铝合金高温条件下流变应力的本构方程。
The hot deformation behavior of 7A85 aluminum alloy was studied at high temperature of 250 ~ 450 ℃ and strain rate of 0.001 ~ 1 s-1 by using Gleeble-1500 thermal simulator. The results show that the dynamic response and dynamic recrystallization of 7A85 aluminum alloy during hot compression are obvious. The deformation resistance increases with the decrease of temperature. When the temperature is lower than 300 ℃, the deformation resistance increases obviously. Meanwhile, the deformation resistance increases with the strain rate Between the strain rate and the flow stress satisfy the exponential relationship between the temperature and flow stress to meet the Arrhenius equation; linear regression method obtained 7A85 aluminum alloy under high temperature flow stress constitutive equation.