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采用圆柱试样在 Gleeble- 15 0 0热模拟机上进行高温压缩变形实验 ,研究了 70 75铝合金在高温塑性变形过程中流变应力的变化规律。实验在温度为 2 5 0～ 5 0 0℃、应变速率为 0 .0 5～ 5 0 s- 1的条件下进行。结果表明 :应变速率和变形温度的变化强烈影响着合金流变应力的大小 ,流变应力随变形温度升高而降低 ,随应变速率提高而增大 ;可用 Zener-Hollomon参数的双曲正弦形式来描述 70 75铝合金高温压缩变形时的流变应力行为
Cylindrical specimens were subjected to high-temperature compression deformation on a Gleeble-1500 thermal simulator to study the variation of flow stress during the high temperature plastic deformation of 7075 aluminum alloy. The experiment was carried out at a temperature of 250 ~ 500 ℃ and a strain rate of 0.05 ~ 500 s-1. The results show that the change of strain rate and deformation temperature strongly influence the flow stress of the alloy. The flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate. The hyperbolic sine form of Zener-Hollomon parameter Describe the flow stress behavior of 70 75 aluminum alloy during high temperature compression deformation