AZ81-1.0Sm-0.6Nd镁合金的高温蠕变行为  

High Temperature Creep Behavior of AZ81-1.0Sm-0.6Nd Magnesium Alloy

作　　者：陈晓亚[1] 李全安[1,2] 陈君[1,2] 张清[1,2] 刘文健[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 [2]有色金属共性技术河南省协同创新中心,河南洛阳471023

出　　处：《铸造》2015年第1期55-59,共5页Foundry

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);河南省基础与前沿技术研究计划项目(102300410018)

摘　　要：研究了AZ81-1．0Sm-0．6Nd镁合金的高温蠕变行为。试验结果表明，在50～70MPa、150～200℃条件下，AZ81—1．0Sm-0．6Nd合金的抗蠕变性能优于基体（AZ81），在150℃／50MPa条件下，AZ81-1-0Sm-0．6Nd合金的稳态蠕变速率为8．82×10^-7s^-1，明显低于Az81合金的1．95×10^-6s^-1的稳态蠕变速率。根据应力指数n值与蠕变激活能Q。值分析结果，随着蠕变试验温度和应力的增加，合金的蠕变机制也在发生变化。High temperature creep behavior of AZ81-1.0Sm-0.6Nd magnesium alloy was studied. The experiment results show that AZ81-1.0Sm-0.6Nd alloy has a better creep resistance properties than that of matrix alloy（AZ81） at 50-70 MPa, 150-200 ℃. Especially, under the condition of 150 ℃/50 MPa, the steady-state creep rate of AZ81-1.0Sm-0.6Nd is 8.82× 10^-7 s^-1, and it is significantly lower than that ofAZ81 alloy which is only 1.95× 10^-6 s^-1. According to the analysis results of stress exponent n value and creep activation energy Qc value, with the temperature and stress of creep experiments increasing, the creep mechanism of the alloy was changed.

关 键 词：AZ81—1.0Sm.0.6Nd 蠕变行为 蠕变速率 应力指数 蠕变激活能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]