李志涛,李全安,陈晓亚

• 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
• 3:西安理工大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)等对Mg-4Y-2Sm-1Gd-0.5Zr合金的微观组织及物相进行了分析,并采用拉伸实验机在不同温度下对其进行了力学性能测试。结果表明:Mg-4Y-2Sm-1Gd-0.5Zr合金的铸态组织主要由α-Mg基体和Mg_(24)Y_5,Mg_(41)Sm_5和Mg_5Gd相组成,经过固溶处理后,稀土元素大部分被固溶进基体形成过饱和固溶体;Mg-4Y-2Sm-1Gd-0.5Zr合金的最佳热处理工艺为525℃×10 h+225℃×12 h,此时合金的抗拉强度、屈服强度和伸长率分别为223.6 MPa、146.5 MPa和14.1%,表明合金具有较高的强度和良好的塑性,综合力学性能优异,其强化机制主要是析出强化;时效态Mg-4Y-2Sm-1Gd-0.5Zr合金在150～250℃范围内强度变化不明显,性能稳定,特别适合在150～250℃服役条件下使用。随拉伸温度的升高,合金的断裂方式由脆性解理断裂向微孔聚集型韧性断裂转变。

关键词(KeyWords)： Mg-4Y-2Sm-1Gd-0.5Zr合金;微观组织;热处理;力学性能

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计划资助项目(152102210072)

作者(Author): 李志涛,李全安,陈晓亚

DOI: 10.13289/j.issn.1009-6264.2018-0307

参考文献(References)：

• [1] 孟波波,李全安,陈晓亚,等.Mg-9Gd-4Y-1Zn-0.5Zr 合金组织和性能[J].材料热处理学报,2017,38(8):35-40.MENG Bo-bo,LI Quan-an,CHEN Xiao-ya,et al.Microstructure and mechanical properties of as-cast Mg-9Gd-4Y-xZn-0.5Zr alloy[J].Transactions of Materials and Heat Treatment,2017,38(8):35-40.
• [2] Yang Z,Wang Z H,Duan H B,et al.Microstructure evolution of Mg-6Gd-2Y alloy during solid solution and aging process[J].Materials Science and Engineering A,2015,631:160-165.
• [3] 陈晓亚,李全安,陈君,等.Gd含量对Mg-Gd-Y-Zr合金组织和性能的影响[J].材料热处理学报,2017,38(11):21-27.CHEN Xiao-ya,LI Quan-an,CHEN Jun,et al.Effect of Gd content on microstructure and properties of Mg-Gd-Y-Zr alloy[J].Transactions of Materials and Heat Treatment,2017,38(11):21-27.
• [4] Liu K,Chen X G.Development of Al-Mn-Mg 3004 alloy for applications at elevated temperature via dispersoid strengthening[J].Materials and Design,2015,84:340-350.
• [5] Sudholz A D,Birbilis N,Berrles C J,et al.Corrosion behaviour of Mg-alloy AZ91E with atypical alloying additions[J].Journal of Alloys and Compounds,2009,471(1):109-115.
• [6] 赵志远.铸造稀土镁合金在我国航空工业中的应用[J].材料工程,1993(7):7-10.ZHAO Zhi-yuan.The application of RE-containing magnesium casting alloys in aviation industry in China[J].The Journal of Materials Engineering,1993(7):7-10.
• [7] 康云,张代东,孟若愚.稀土镁合金合金化原理及方法的研究[J].山西冶金,2008(5):5-7.KANG Yun,ZHANG Dai-dong,MENG Ruo-yu.Study on the principle and method of alloying of rare earth magnesium alloy[J].Shanxi Metallurgy,2008(5):5-7.
• [8] 陈君,李全安,张清.钇对AZ6l镁合金组织和性能的影响[J].中国稀土学报,2015,33(4):449-454.CHEN Jun,LI Quan-an,ZHANG Qing.Effect of Y on microstructure and properties of AZ61 magnesium alloy[J].Journal of the Chinese Society of Rare Earths,2015,33(4):449-454.
• [9] 李大全.Mg-Y-Sm-Zr系镁合金组织性能研究[D].上海:上海交通大学,2008.LI Da-quan.Study on the microstructure and mechanical properties of Mg-Y-Sm-Zr alloys[D].Shanghai:Shanghai Jiao Tong University,2008.
• [10] 刘志杰.砂型铸造Mg-4Y-2Nd-1Gd镁合金微观组织与力学行为研究[D].上海:上海交通大学,2013.LIU Zhi-jie.Study on the microstructure and mechanical properties of sand-cast Mg-4Y-2Nd-1Gd magnesium alloy[D].Shanghai:Shanghai Jiao Tong University,2013.
• [11] Li D Q,Wang Q D,Ding W J.Effects of samarium on microstructure and mechanical properties of Mg-Y-Sm-Zr alloys during thermo-mechanical treatments[J].Journal of Materials Science,2009,44:3049-3056.
• [12] Abrukina N R.Microhardness of phases in the Systems Mg-Sm-Y and Mg-Sm-Zn[J].Russian Metallurgy:Metally,1987(2):219-221.
• [13] 杨晓红,彭丽梅,杨晨辉,等.固溶时效Mg-4Y-3Nd合金析出相与基体微观结构[J].材料热处理学报,2015,36(4):39-43.YANG Xiao-hong,PENG Li-mei,YANG Chen-hui,et al.Microstructure of Mg-4Y-3Nd alloy after solution and aging treatment[J].Transactions of Materials and Heat Treatment,2015,36(4):39-43.
• [14] 王战华.固溶和时效对三种Mg-Gd-Y合金组织与性能的影响[D].西安:西安工业大学,2015.WANG Zhan-hua.Effect of solution and aging on microstructure and properties of three kinds of Mg-Gd-Y alloys[D].Xi'an:Xi'an Technological University,2015.
• [15] 刘志杰,吴国华,刘文才,等.固溶处理对Mg-4Y-2Nd-1Gd-0.4Zr 镁合金组织和性能的影响[J].材料热处理学报,2013,34(3):60-66.LIU Zhi-jie,WU Guo-hua,LIU Wen-cai,et al.Influence of solution treatment on microstructure and properties of Mg-4Y-2Nd-1Gd-0.4Zr magnesium alloy[J].Transactions of Materials and Heat Treatment,2013,34(3):60-66.

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