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通过在Gleeble-1500热模拟实验机上对7A04铝合金进行高温压缩实验,研究了该合金变形温度在300～450℃,应变速率在0.01～10 s-1范围内的高温流变变形行为。结果表明:流变应力随变形温度的升高而降低,随着应变速率的增加而升高。建立了一个综合考虑应变、温度、应变速率三者影响的流变应力方程,预测值与拟合实验值非常接近,结果表明:该流变应力方程用来预测7A04铝合金材料一般加载情况下的热成形过程是比较可靠的。
The high-temperature deformation of 7A04 aluminum alloy was investigated by Gleeble-1500 thermal simulator. The deformation behavior of 7A04 aluminum alloy at 300-450 ℃ and strain rate of 0.01-10 s-1 was investigated. The results show that the flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate. The flow stress equation was established considering the effects of strain, temperature and strain rate. The predicted value is very close to the fitted experimental value. The results show that the flow stress equation is used to predict the flowability of 7A04 aluminum alloy under normal loading Thermoforming process is more reliable.