Mg-Al-Zn系合金高温压缩流变应力研究  

Flow Stress of Mg-Al-Zn Alloys during Hot Compression Deformation at Elevated Temperatures

作　　者：郭强[1] 严红革[1] 陈振华[1] 张辉[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2006年第3期75-79,共5页Journal of Hunan University:Natural Sciences

基　　金：湖南省科技重大专项计划资助项目(04GK1008-1);湖南省科技厅重点资助项目(03JKY1016)

摘　　要：在Gleeble-1500热模拟机上对Mg-Al-Zn系合金(AZ31和AZ80)的高温压缩流变应力行为进行研究.结果表明:材料真应力-应变曲线呈现动态再结晶特征.合金元素含量差异引起材料高温变形行为不同.AZ31合金流变应力行为受变形温度影响:变形温度低于350℃时呈幂指数关系;高于350℃时呈指数关系,应力指数n为7,热变形激活能Q为112 kJ/mol.AZ80合金高温流变应力符合幂指数关系,应力指数n为6,热变形激活能Q为220 kJ/mol.The flow stress behaviors of Mg-Al-Zn alloys （AZ31 alloy and AZ80 alloy） were studied by means of compression deformation tests on Gleeble 1 500 machines. The results showed that flow stress behaviors were characteristics of the hot working processes where dynamic recrystallization led to work softening, and depended on the alloying dements of the alloys. The flow stress behaviors of AZ31 depended on the deformation temperature. Constitutive analysis showed that the maximum stress for AZ31 alloy could be represented by a Zener-Hollomon parameter in the exponent-type equation during deformation temperature below 350 ℃, and by the power equation over 350 ℃ with the hot deformation activation energy Q of 112 kJ/mol, stress exponent = 7 and maximum stress for AZ80 alloy could be represented by the exponent-type equation with the activation energy Q of 220 kJ/mol, stress exponent =6.

关 键 词：AZ31合金 AZ80合金 高温压缩 流变应力 

分 类 号：TG146.22[一般工业技术—材料科学与工程]