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采用Gleeble-3500热模拟试验机对一种新型的耐热高强度铝合金211Z.X进行等温压缩试验,研究其热变形行为,试验条件为温度350~500℃、应变速率0.01~10.00 s~(-1)。试验得出了该合金在热加工状态下的应力应变曲线,通过分析应变对材料常数的影响,获得了相应的变化规律,得到应变与材料常数之间的6次多项式的拟合关系,根据Arrhenius模型建立了应变补偿本构关系模型,并对该模型进行了验证。研究结果表明:变形温度和应变速率对合金的流变应力有显著的影响,在实验温度相同的条件下,流变应力随应变速率的增大而升高,应变速率相同时,随温度的增加而降低,说明合金具有正的应变速率敏感性;应变对材料常数具有很大的影响,变形激活能Q随应变的增加逐渐降低,合金的可加工性逐渐改善;通过计算得到的流变应力与试验值具有较高的吻合度,相关性R为0.9801,平均相对误差为6.132%。
A new type of heat-resistant and high-strength aluminum alloy 211Z.X was subjected to isothermal compression test using Gleeble-3500 thermal simulator to study its thermal deformation behavior. The test conditions were: temperature 350 ~ 500 ℃, strain rate 0.01 ~ 10.00 s ~ ( -1). The stress-strain curve of this alloy under hot working condition was obtained. By analyzing the effect of strain on the material constants, the corresponding variation rule was obtained, and the fitting relationship of the 6th order polynomial between strain and material constant was obtained. According to Arrhenius The strain compensation constitutive model was established and the model was verified. The results show that the deformation temperature and the strain rate have a significant effect on the flow stress of the alloy. Under the same experimental temperature, the flow stress increases with the increase of the strain rate. When the strain rate is the same, And decrease, indicating that the alloy has a positive strain rate sensitivity; strain has a great effect on the material constant, the deformation activation energy Q decreases gradually with the increase of strain, and the machinability of the alloy gradually improves; and the calculated flow stress and The test value has a high degree of agreement, correlation R 0.9801, the average relative error of 6.132%.