采用Gleeble-3500型热模拟机对7075/6009 铝合金复合材料在变形温度为300~ 500℃、应变速率为0.001~1s-1条件下的热压缩变形进行了研究, 并得出了本构方程。结果表明:应变速率和变形温度对该复合材料的流变应力有显著影响, 流变应力随变形温度的升高而降低, 随应变速率的提高而增大;可采用Zener-Hollomon参数的双曲正弦函数来描述该复合材料热压缩变形的峰值流变应力;热压缩变形本构方程中的结构因子犃、应力水平参数α和应力指数狀分别为1.23×1011s-1, 0.021和6.449, 热变形激活能犙为166.89kJ·mol-1。

The hot compression deformation of 7075/6009 aluminium composite was studied in the temperature range of 300-500 ℃ and strain rate range of 0.001-1 s-1 by using Gleeble-3500 thermal simulation tester, and the constitutive equation was got. The results show that the flow stress of the composite was significantly affected by strain rate and deformation temperature. The flow stress decreased with the increase of deformation temperature and increased with the increase of strain rate. The peak flow stress behavior of the composite during deformation at high temperature could be described by hyperbolic sine function of Zener-Hollomon parameter. The structural factor A, stress level parameter α and stress index n in the analysis formular of peak flow stress was 1.23×1011 s-1, 0.021 and 6.449, respectively. The hot deformation activation energy of the composite was 168.89 kJ·mol-1.