Mg-6Al-1Zn-1.8Gd-0.9Y镁合金的高温蠕变行为  

High Temperature Creep Behavior of Mg-6Al-1Zn-1.8Gd-0.9Y Alloy

作　　者：陈晓亚[1] 李全安[1] 陈君[1] 张清[1] 宋晓杰[1] 蒋慧珍[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《热加工工艺》2016年第6期94-97,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51171059);河南省高校科技创新团队支持计划资助(2012IRTSTHN008);河南省高校科技创新团队支持计划资助世间(2012IRTSTHN008)

摘　　要：研究了Mg-6Al-1Zn-1.8Gd-0.9Y镁合金的高温蠕变行为。结果表明:Mg-6Al-1Zn-1.8Gd-0.9Y合金在50MPa、150℃的蠕变量为0.86%,稳态蠕变速率为1.8×10^(-8) s^(-1);经热处理后的合金在50MPa、150℃的蠕变量为0.36%,稳态蠕变速率为8.9×10^(-9)s^(-1),基本可满足高温下的使用要求。铸态合金在50MPa下的蠕变激活能为24.3kJ/mol,热处理后的合金在50、70MPa下的蠕变激活能分别为23.4、34.3 kJ/mol,这与晶界滑移激活能接近。The high temperature creep behavior of Mg-6Al-1Zn-1.8Gd-0.9Y alloy was analyzed. The results show that the creep value of the alloy is 0.86% at 50MPa and 150 ℃. The steady state creep rate is 1.8×10-8 s-1, After heat treatment, the creep value of the alloy in 50MPa and 150℃ is 0.36% and the steady state creep rate is 8.9×10-9s-1, which can satisfy the use requirement at high temperature, the creep activation energy of the as-cast alloy is 24.3 kJ/mol in 50MPa. After heat treatment, the creep activation energy of the alloy in 50 MPa and 70 MPa is 23.4 kJ/mol and 34.3 kJ/mol, respectively, which is closed to the grain boundary sliding activation.

关 键 词：Mg-6Al-1Zn-1.8Gd-0.9Y 蠕变行为 蠕变速率 蠕变激活能 

分 类 号：TG113.25[金属学及工艺—物理冶金]