孟波波,李全安,陈晓亚,李志涛

• 1:河南科技大学材料科学与工程学院
• 2:有色金属共性技术河南省协同创新中心

摘要(Abstract)：

采用光学显微镜和蠕变实验机研究Mg-9Gd-4Y-1Zn-0.5Zr合金在不同温度和应力下的高温蠕变行为。结果表明:在应力为70~130 MPa范围内,200℃时Mg-9Gd-4Y-1Zn-0.5Zr合金的蠕变应力指数n=1.63,蠕变机制为晶界滑动,250℃时蠕变应力指数n=2.63,蠕变机制为位错滑移;在蠕变温度为200~250℃范围内,应力分别为70、90、110和130 MPa时,合金的蠕变激活能Qc分别为108.5、118.9、127.6和134.3 k J/mol;随着温度和应力的增加,合金晶粒长大,合金的蠕变机制由晶界滑动控制转变为位错滑移控制。

关键词(KeyWords)： Mg-9Gd-4Y-1Zn-0.5Zr合金;蠕变行为;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);; 河南省重点科技攻关项目(152102210072);; 河南科技大学第六届研究生创新基金(CXJJ-2016-ZR06)

作者(Author): 孟波波,李全安,陈晓亚,李志涛

DOI: 10.13289/j.issn.1009-6264.2018-0046

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