铝青铜合金热变形流变应力特征

Flow Stress Feature of Aluminium Bronze Alloy under Hot Deformation

采用Gleeble-3500热模拟机进行圆柱体压缩试验,研究了新型铝青铜合金在变形温度为650～950℃、应变速率为0.01～5s-1、真应变为0～0.8条件下的流变应力特征。结果表明:应变速率为0.01和5s-1时,铝青铜合金首先出现加工硬化,流变应力达到峰值后趋于平稳,表现出动态回复的特征;应变速率为0.1和1s-1时,合金发生了局部动态再结晶;可用Zener-Hollomon参数的双曲正弦形式来描述新型铝青铜合金热压缩变形时的流变应力行为。

The cylindrical compression tests was carried out by Gleeble-3500 system; the flow stress feature of aluminium bronze alloy under hot deformation was investigated under the condition of temperature 650-950℃, strain rate 0.01-5 s^-1 and true strain 0-0.8. The results show that when the strain rate is 0.01 s^-1 and 5 s^-1, the deformation of aluminium bronze alloy shows working hardening, flow stress is up to a peak stress and reaches stable value, showing dynamic recovery; When the strain rate is 0.1 and 1 s^-1, the flow curve exhibits partial dynamic recrystallization. The flow stress of aluminium bronze alloy during hot compression deformation can be represented by a Zener-Hollomon parameter of the hyperbolic sine form.