戚尧,李全安,陈晓亚,史浩鹏

• 1:河南科技大学材料科学与工程学院
• 2: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)：

采用光学显微镜、扫描电镜、X射线衍射仪、差示扫描量热仪对Mg-5Y-3Sm-4Ho-0.5Zr合金的物相组成及显微组织进行了研究,并采用电子拉伸实验机和布氏硬度计研究了合金的力学性能。结果表明:Mg-5Y-3Sm-4Ho-0.5Zr合金的铸态组织主要由α-Mg基体和断续分布于晶界的Mg_(24)Y_5、Mg_(24)Ho_5和Mg_(41)Sm_5组成,固溶处理后,大部分稀土元素被固溶进基体中形成过饱和固溶体,经时效处理后,有弥散分布的第二相析出;Mg-5Y-3Sm-4Ho-0.5Zr合金的最佳热处理工艺为525℃固溶12 h,然后225℃时效14 h,此时合金具有最好的综合力学性能,硬度、抗拉强度、屈服强度和伸长率分别为106 HBW、246 MPa、242 MPa和3.33%。

关键词(KeyWords)： Mg-5Y-3Sm-4Ho-0.5Zr合金;热处理;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51571084,51171059)

作者(Author): 戚尧,李全安,陈晓亚,史浩鹏

DOI: 10.13289/j.issn.1009-6264.2020-0015

参考文献(References)：

• [1] Liu L Z,Chen X H,Wang J F,et al.Effects of Y and Zn additions on electrical conductivity and electromagnetic shielding effectiveness of Mg-Y-Zn alloys[J].Journal of Materials Science and Technology,2019,35(6):1074-1080.
• [2] Lü S H,Lü X L,Meng F Z,et al.Microstructures and mechanical properties of a hot-extruded Mg-8Ho-0.6Zn-0.5Zr alloy[J].Journal of Alloys and Compounds,2019,774:926-938.
• [3] 宽军,孙毅,韩少兵,等.固溶时效对Mg-2Y-1Zn-0.4Zr生物镁合金组织和力学性能的影响[J].材料热处理学报,2018,39(5):31-36.KUAN Jun,SUN Yi,HAN Shao-bing,et al.Effect of solid solution and aging treatment on microstructure and mechanical properties of Mg-2Zn-1Y-1.4Zr biological magnesium alloy[J].Transactions of Materials and Heat Treatment,2018,39(5):31-36.
• [4] Charles M,Guo H,Zou Y,et al.Effects of holmium and hot-rolling on microstructure and mechanical properties of Mg-Li based alloys[J].Journal of Rare Earths,2016,34(12):1269-1276.
• [5] 张娜,程仁菊,董含武,等.Sr在耐热镁合金中的应用及研究进展[J].材料导报,2019,33(15):2565-2571.ZHANG Na,CHENG Ren-ju,DONG Han-wu,et al.Application and research progress of strontium in heat-resistant magnesium alloy[J].Materials Review,2019,33(15):2565-2571.
• [6] 吴国华,陈玉狮,丁文江.镁合金在航空航天领域研究应用现状与展望[J].载人航天,2016,22(3):281-292.WU Guo-hua,CHEN Yu-shi,DING Wen-jiang.Current research,application and future prospect of magnesium alloys in aerospace industry[J].Manned Spaceflight,2016,22(3):281-292.
• [7] Li X Q,Ma G J,Yin J,et al.Rare earth alloying:Toward high mechanical properties for magnesium alloys[J].Materials Review,2017,31(21):82-89.
• [8] 谢建昌,李全安,李建弘,等.耐热镁合金及其开发思路[J].铸造技术,2008,29(1):124-127.XIE Jian-chang,LI Quan-an,LI Jian-hong,et al.Heat resistant magnesium alloys and developing strategies[J].Foundry Technology,2008,29(1):124-127.
• [9] 张清,王莹,李萍.Mg-Y-Sm系合金的设计和力学性能的研究进展[J].材料热处理学报,2019,40(5):17-23.ZHANG Qing,WANG Ying,LI Ping.Research progress on design and mechanical properties of Mg-Y-Sm series alloy[J].Transactions of Materials and Heat Treatment,2019,40(5):17-23.
• [10] 巫瑞智.先进镁合金制备与加工技术[M].北京:科学出版社,2012.
• [11] Wang J,Zhang D P,Fang D Q,et al.Effect of Y for enhanced age hardening response and mechanical properties of Mg-Ho-Y-Zr alloys[J].Journal of Alloys and Compounds,2008,454:194-200.
• [12] 刘宝忠,范燕平,刘娇娇,等.重稀土耐热镁合金的研究现状及发展[J].材料导报,2012,26(11):110-113.LIU Bao-zhong,FAN Yan-ping,LIU Jiao-jiao,et al.Research and development of heat resistant magnesium-heavy rare earth alloy[J].Materials Review,2012,26(11):110-113.
• [13] 王文礼,张薇,雷宁宁,等.稀土元素Sm、Ce对Mg-Y系合金组织和性能的影响[J].稀有金属材料与工程,2016(6):1473-1476.WANG Wen-li,ZHANG Wei,LEI Ning-ning,et al.Effect of Sm and Ce addition on microstructures and mechanical properties of Mg-Y series magnesium alloy[J].Rare Metal Materials and Engineering,2016(6):1473-1476.
• [14] Li D Q,Wang Q D,Ding W J.Characterization of phases in Mg-4Y-4Sm-0.5Zr alloy processed by heat treatment[J].Materials Science and Engineering A,2006,428(1/2):295-300.
• [15] Tang C P,Wu K,Liu W H,et al.Effects of Gd,Y content on the microstructure and mechanical properties of Mg-Gd-Y-Nd-Zr alloy[J].Metals,2018,8(10):790-800.
• [16] 唐昌平,刘文辉,陈宇强,等.Y含量对铸造Mg-Gd-Y-Nd-Zr合金组织与性能的影响[J].材料导报,2016,30(16):86-90.TANG Chang-ping,LIU Wen-hui,CHEN Yu-qiang,et al.Effects of Y content on microstructures and mechanical properties of Mg-Gd-Y-Nd-Zr casting alloy[J].Materials Review,2016,30(16):86-90.
• [17] Liu B Z,Liu J J,Wang J L,et al.The effect of Y on aging response and mechanical properties of Mg-Ho-Zr alloys[J].Materials Science Forum,2011,704-705:546-551.

文章评论(Comment)：