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通过在Gleeble-l500热模拟试验机上进行等温热压缩试验,研究2E12铝合金在变形温度为300～500℃和应变速率为0.0l～l0 s-1条件下的流变应力行为,计算、推导出用包含Arrhenius项的Zener-Hollomon参数描述2E12合金高温压缩流变行为的表达式,并分析形变热、变形温度和应变速率等参数对流变应力的影响规律。结果表明:应变速率和变形温度对2E12合金的流变应力影响显著,流变应力随着温度的升高而降低,随着应变速率的提高而增大;在ε≥1 s-1时,形变热导致流变应力降低,且幅度随着应变速率的增大而增大,随着变形温度的升高而降低。
Through the isothermal hot compression test on a Gleeble-l500 thermal simulator, the flow stress behavior of 2E12 aluminum alloy under the deformation temperature of 300-500 ℃ and the strain rate of 0.0l-l0 s-1 was calculated and deduced The Zener-Hollomon parameters including Arrhenius term are used to describe the rheological behavior of 2E12 alloy at high temperature. The effects of deformation heat, deformation temperature and strain rate on the flow stress are also analyzed. The results show that the strain rate and deformation temperature have significant effects on the flow stress of 2E12 alloy. The flow stress decreases with the increase of temperature and increases with the increase of strain rate. When ε≥1 s-1, Heat causes the flow stress to decrease, and the magnitude increases with increasing strain rate, decreasing with increasing deformation temperature.