摘要
采用热模拟试验对1种Al-Mg-Sc合金进行等温热压缩实验,研究该合金在变形温度为300～450℃,应变速率0.001～1s-1条件下的热压缩变形流变应力行为。结果表明:该Al-Mg-Sc合金在变形温度为300℃,应变速率0.01～1s-1的条件下,流变应力开始随应变增加而增大,达到峰值后趋于平稳,表现出动态回复特征;而在其他条件下,应力达到峰值后随应变的增加而逐渐下降,表现出动态再结晶特征。应变速率和流变应力之间满足指数关系,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该材料的应变硬化指数n以及变形激活能Q,获得该铝合金高温条件下的流变应力本构方程。
The flow stress behavior of the Al-Mg-Sc alloy during hot compression deformation conditions was studied by isothermal hot compression with thermal simulation test at deformation temperature range of 300--450 ℃ and strain rate range of 0.001-1 s^-1. The experimental results indicate that the flow stress of Al-Mg-Sc alloy increases with increasing strain and tends to be constant after a peak value at 300 ℃ and strain rates range of 0.01-1 s^-1, showing dynamic recovery. The flow stress falls down after a peak value with the increase of strain in other conditions, showing dynamic recrystallization. A hyperbolic sine relationship is found to correlate well 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.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第4期926-931,共6页
Journal of Central South University:Science and Technology
基金
国家"863"计划项目(2006AA03Z523)
