付三玲,李全安,张清

• 1:河南科技大学物理与工程学院
• 2:河南科技大学材料科学与工程学院
• 3:有色金属新材料与先进加工技术省部共建协同创新中心

摘要(Abstract)：

利用RC-1130型蠕变持久试验机测试了时效态Mg-12Gd-3Y-1Sm-0.5Zr合金在(200、250、300℃)/(50、70、90 MPa)的条件下的拉伸蠕变行为。结果表明：当蠕变温度一定时，合金的蠕变应变随蠕变应力增加而增大；当蠕变应力一定时，蠕变应变随蠕变温度增大而增大，合金的蠕变应变对蠕变温度更敏感。由应力指数和蠕变激活能计算可知，蠕变应力为50～90 MPa,在200℃时，合金的应力指数为1.560;在250和300℃时，应力指数分别为2.230和3.602。蠕变温度为200～250℃,50 MPa下，合金的蠕变激活能为111.9 kJ/mol;当应力增大至70 MPa和90 MPa时，蠕变激活能分别为137.4 kJ/mol和142.6 kJ/mol;在250～300℃/50～90 MPa条件下，合金的蠕变激活能为126.2～87.0 kJ/mol。随着蠕变温度和应力的提高，合金的蠕变机制由晶界滑移为主转变为位错滑移为主。

关键词(KeyWords)： Mg-Gd多元镁合金;蠕变;应力指数;蠕变激活能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51571084,51171059);; 河南科技大学博士科研启动基金项目

作者(Author): 付三玲,李全安,张清

DOI: 10.13289/j.issn.1009-6264.2022-0046

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