苗天虎,龚海,王力,吴泽威,王政,罗杉,胡励

• 1:重庆理工大学材料科学与工程学院
• 2:重庆齿轮箱有限责任公司技术中心

摘要(Abstract)：

深空环境中复杂的高低温交变温度场会对稀土镁合金构件的力学性能和服役寿命产生显著影响,然而相关研究还少见报道。鉴于此,对固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr镁合金进行了不同次数的高低温循环热处理(-196℃×45 min→196℃×45 min),采用X射线衍射仪(XRD)、场发射扫描电镜(SEM)和室温单轴压缩实验等研究了高低温循环热处理对其力学性能和微观组织演化的影响。结果表明:在经历0次(0C)、1次(1C)、6次(6C)、20次(20C)高低温循环热处理后,试样的LPSO相体积分数分别为10.00%、10.45%、9.86%和10.71%,说明循环次数对于LPSO相体积分数影响可忽略不计;循环次数会影响合金中基面峰、柱面峰和锥面峰的峰强度,这说明合金在高低温循环热处理过程中会发生部分晶粒区域的取向转动;0C、1C、6C和20C样品的屈服强度分别为322、249、263和316 MPa,极限抗压强度分别为552、620、670和645 MPa,断裂伸长率分别为8.02%、11.21%、10.76%和8.11%;上述力学性能的变化,与不同循环次数高低温循环热处理中,Mg-10Gd-6Y-1.5Zn-0.5Zr镁合金的整体位错密度变化、晶粒晶界附近以及LPSO相和基体界面位置处几何必要位错(Geometrically necessary dislocation, GND)变化密切相关。

关键词(KeyWords)： Mg-RE-Zn镁合金;高低温循环热处理;力学性能;微观组织演化;LPSO相

Abstract:

Keywords:

基金项目(Foundation): 重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0252);; 重庆理工大学科研创新团队培育计划项目(2023TDZ010);重庆理工大学校级研究生创新项目(gzlcx20232013);重庆理工大学大学生创新创业训练计划(26)

作者(Author): 苗天虎,龚海,王力,吴泽威,王政,罗杉,胡励

DOI: 10.13289/j.issn.1009-6264.2024-0573

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