摘要
采用Gleebe1500热模拟机对Al-Zn-Mg-Cu-Zr合金进行热压缩,研究了该合金在应变速率为0.001~1.0s^(-1)、变形温度为250~450℃条件下的流变特性。结果表明:在应变速率为0.001s-1,变形温度为250~450℃范围内,流变应力达到峰值后随着应变量的增加而降低,呈现出连续动态再结晶特征;在其他变形条件下存在较为明显的稳态流变特征。应变速率和流变应力之间满足指数关系,变形温度和流变应力之间满足Arrhenius关系。通过线性回归分析计算出合金的应变硬化指数n以及热变形激活能Q得到了该合金在高温变形条件下的流变应力本构方程。
The flow stress of the compression deformation for Al - Zn - Mg - Cu - Zr alloy in the temperature range of 250 -450℃ and strain rate range of 0. 001 - 1.0s ^- 1 were studied by isothermal compression with Gleebe - 1500 simulated machine. The results show that when the strain rate is 0.001 s ^- 1 （the deformation temperature is 250 ~ 450℃）, the flow stress decreases after a peak value, showing continuous dynamic recrystallization characteristics. The steady - state flow characteristics exist on the other deformation conditions. Hyperbolic sine relationships are found to correlate the flow stress with the strain rate, and an Arrhenius relationship with the temperature. The strain hardening coefficient n and deformation activation energy Q are evaluated by linear regression analysis. And the flow stress constitutive equation of the alloy during hot compression is obtained.
作者
曾渝
Zengyu(Research Institute of Baoshan Iron and Steel Co,Ltd., Shanghai 201900, China State Key Laboratory of Development and Application Technology of Automotive Steels （ BaoSteel）, Shanghai 201900, China)
出处
《轻金属》
CSCD
北大核心
2017年第1期50-54,共5页
Light Metals
