采用Gleeble-1500型热模拟试验机对Al-1.04Mg-0.85Si-0.01Cu铝合金进行热压缩试验, 研究了其在300~500 ℃和0.001~1.0 s-1应变速率下的热变形行为, 并利用光学显微镜分析了其不同条件变形后的显微组织。结果表明: 该合金的热变形行为可用双曲正弦形式的本构方程来描述; 应变速率小于1.0 s-1时, 随温度升高和应变速率增加, 合金的变形激活能提高, 应变速率为1.0 s-1时, 变形激活能有所下降; 计算得到该合金的热变形激活能为193.029 kJ·mol-1, 低于6061合金的变形激活能; 该合金的热加工性能优良。

The hot compression test was performed on Al-1.04Mg-0.85Si-0.01Cu aluminum alloy by Gleeble-1500 thermal simulation tester, the thermal deformation behavior of the alloy in the temperature range of 300-500 ℃ and strain rate range of 0.001-1.0 s-1was studied, and the microstructure was analyzed by optical microscopy after deformation under different conditions. The results show that the hot deformation behavior of the alloy could be described by a constitutive equation in hyperbolic sine function. When the strain rate was less than 1.0 s-1 , the deformation activation energy of the alloy rose with the increase of temperature and strain rate, however, the deformation activation energy decreased when the strain rate was 1.0 s-1. The calculated value of hot deformation activation energy of the aluminum alloy was 193.029 kJ·mol-1, and it was less than the deformation activation energy of 6061 alloy. The tested alloy has excellent hot workability.