Hot Deformation Behavior and Hot Processing Map of Al-8.8Zn-1.4Mg-0.5Cu-0.1Sc-0.1Er-0.1Zr Alloy
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摘要: 采用Gleeble-3800型热模拟试验机对Al-8.8Zn-1.4Mg-0.5Cu-0.1Sc-0.1Er-0.1Zr合金在变形温度380~440℃，应变速率0.01~10 s-1，变形量45%，60%条件下进行等温压缩试验，研究了该合金的热变形行为，构建了变形本构方程和基于动态材料模型的热加工图，确定了最佳热加工工艺参数区间，并对特征区的组织进行了分析。结果表明：试验合金的等温压缩过程具有等温流变特征、正应变速率和负温度敏感性；在试验范围内最佳的热加工工艺参数为变形温度425~440℃、应变速率0.01~0.02 s-1；合金的失稳区主要发生在大变形量、低变形温度、高应变速率条件，组织中位错塞积和绝热剪切带的出现是试验合金发生失稳的主要原因。Abstract: Al-8.8Zn-1.4Mg-0.5Cu-0.1Sc-0.1Er-0.1Zr alloy was subjected to isothermal compression tests on Gleeble 3800 thermal simulation testing machine under conditions of deformation temperature of 380-440℃, strain rate of 0.01-10 s-1 and deformation amount of 45%, 60%. The hot deformation behavior of the alloy was studied, and the deformation constitutive equation and hot processing map based on dynamic material model were established. The best range of hot processing parameters was confirmed, and the microstructure of characteristic zone was observed. The results show that test alloy showed characteristics of isothermal rheological, sensitivity of positive strain rate and negative temperature. The best range of hot processing parameters within test range was deformation temperature of 425-440℃ and strain rate of 0.01-0.02 s-1. The instability zone of the alloy mainly appeared in the condition of large strain, low deformation temperature and large deformation amount. The dislocation pile-up and adiabatic shear band in the microstructure were main reasons for the instability of test alloy.
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