7056铝合金高温热压缩流变应力行为

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0.01～10 s~(-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224.3826 kJ/mol.

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

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-Hollomen parameters in the hyperbolic sine equation, and the hot deformation activation energy is 224.3826 kJ/mol.