7056铝合金高温热压缩流变应力行为

Flow Stress Behavior of 7056 Aluminum Alloy During Hot Compression Deformation at Elevated Temperature

在Gleeble-1500热模拟机上对7056铝合金进行热压缩实验,变形温度为300～450℃,应变速率为0.01～10s-1,研究其热压缩流变应力行为。结果表明:流变应力开始随应变的增加而增大,出现峰值后逐渐趋于平稳;应力峰值随着温度的升高而减小,随着应变速率的增大而增大;可用包含Zener-Hollomon参数的双曲正弦关系来描述合金热流变行为,其变形激活能为224.3826kJ/mol。

The flow stress behavior of 7056 aluminum alloy during hot compression deformation was studied by thermal simulation test on Gleeble 1500 system. The deformation temperature is from 300 ℃to 450 ℃ and the strain rate is from 0.01 s-1 to 10 s-1. The results show that the flow stress increases with the increase of strain and tends to be constant after a peak value. The peak stress increases with the increase of strain rate, and decreases with the increase of deformation temperature, which can be represented by a Zener-Hollomon parameters in the hyperbolic sine equation,and the hot deformation activation energy is 224.3826 kJ/mol.