Al-6.0% Zn-2.0% Mg-1.5% Cu-0.4% Er-0.15% Zr合金热变形流变行为与显微组织分析  

Flow behavior and microstructure analysis of Al-6.0% Zn-2.0% Mg-1.5% Cu-0.15% Zr alloy during hot deformation

作　　者：吴柳融[1] 夏长清[1] 涂卡西[1] 李学雄[1] 罗芸[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《中国体视学与图像分析》2011年第3期271-278,共8页Chinese Journal of Stereology and Image Analysis

基　　金：国家重点基础研究发展规划资助项目(2005CB623706)

摘　　要：采用Gleeble-1 500热模拟机对Al-6.0%Zn-2.0%Mg-1.5%Cu-0.4%Er-0.15%Zr合金进行压缩变形实验,变形温度为300～460℃,应变速率为0.001～10 s-1。利用光学显微镜观察不同变形条件下合金的金相组织,确定合适的热变形参数。研究表明:Al-6.0%Zn-2.0%Mg-1.5%Cu-0.4%Er-0.15%Zr合金的峰值应力随应变温度的升高而减小,合金软化机制由动态回复转变为动态再结晶;流变应力随变形速率的增大而增大,在应变速率为10 s-1时合金微观组织显示出明显的动态再结晶特征。合金热变形行为可用双曲正弦修正Arrhenius函数关系式表示,热变形激活能为Q=219.99 kJ/mol。The hot deformation behavior of Al-6.0%Zn-2.0%Mg-1.5%Cu-0.4%Er-0.15%Zr alloy at 300～ 460℃ and strain rate of 0.001～10 s-1 was studied by Gleeble-1500 simulator.The microstructure of different deformation conditions was observed by optical microscopy,and the feasible deformation parameters were determined.The rusults show that the peak stress of Al-6.0%Zn-2.0%Mg-1.5%Cu-0.4%Er-0.15%Zr alloy decreased with the increasing deformation temperature and the soften mechanism transformed from dynamic recovery to dynamic recrystallization.The flow stress increased with the increasing deformation strain and the microstructure displayed obvious feature of dynamic recrystallization at the strain rate of 10 s-1.The hot deformation behavior of the alloy can be descriabed by Arrhenius function revised by hyperbolic sine function with an activation energy of 219.99 kJ/mol.

关 键 词：Al-Zn-Mg-Cu-Er-Zr合金 热变形 流变应力 显微组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]