2026铝合金热压缩变形流变行为研究

Flow Behavior of 2026 Aluminum Alloy During Hot Compression Deformation

在Gleeble-1500热模机上对2026铝合金进行了热压缩实验,研究该合金在变形温度为300～500℃、应变速率为0.01～10 s-1条件下热压缩变形流变应力行为。结果表明:流变应力开始随应变的增加而增大,出现峰值后逐渐减小并趋于平稳,表现出流变软化特征;应力峰值随温度的升高而减小,随应变速率的增大而增大;可用包含Zener-Hollomon参数的Arrhenius双曲正弦关系来描述2026铝合金热变形行为,其变形激活能为256.02 kJ/mol。合金热压缩变形的主要软化机制由动态回复转化为连续动态再结晶。

The flow stress behavior of 2026 aluminum alloy during hot compression deformation was studied by thermal simulation test on Gleeble 1500 system at deformation temperature range from 300 ℃ to 500 ℃ and strain rate range from 0.01 s^-1 to 10 s^-1. The results show that the flow stress exhibits a peak stress at critical strain, the flow stress decreases monotonically with the increase of strain, and then tends to be constant until high strain, showing a dynamic flow softening. The peak stress decreases with the increase of deformation temperature and the decrease of strain rate, which can be represented by a Zener-Hollomon parameter in the hyperbolic sine equation, its hot deformation activation energy is 256.02 kJ/mol. The main soften mechanism of the alloy during hot compression deformation transforms from dynamic recovery to continuous dynamic recrystallization.