陈晓亚,李全安,陈君,孟波波

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

摘要(Abstract)：

采用光学显微镜对Mg-xGd-2Y-0.5Zr(x=9,11,13,15 mass%)合金铸态、固溶时效态以及拉伸断口附近纵切面组织进行观察分析,并用扫描电镜和电子拉伸试验机分别对合金断口形貌和不同温度下的力学性能进行测试和分析。研究结果表明:铸态Mg-xGd-2Y-0.5Zr合金经525℃固溶6 h和225℃时效10 h后粗大的枝晶消失,晶界清晰可见;当Gd的添加为13 mass%时,合金的晶粒最细小,组织分布最均匀,Mg-13Gd-2Y-0.5Zr合金具有优异的室温和高温力学性能,其在室温和高温下的抗拉强度达到最大值。当Gd的含量一定时,合金的抗拉强度随拉伸温度的升高先升高后降低,在250℃时达到最大值;Mg-13Gd-2Y-0.5Zr合金断裂形式为脆性断裂,并以沿晶断裂为主。

关键词(KeyWords)： Mg-Gd-Y-Zr合金;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);; 河南省重点科技攻关计划资助项目(152102210072)

作者(Author): 陈晓亚,李全安,陈君,孟波波

DOI: 10.13289/j.issn.1009-6264.2017-0335

参考文献(References)：

• [1]Wan Y C,Xiao H C,Jiang S N,et al.Microstructure and mechanical properties of semi-continuous cast Mg-Gd-Y-Zr alloy[J].Materials Science&Engineering A,2014,617:243-248.
• [2]Jafari Nodooshan H R,Wu G H,Liu W C,et al.Effect of Gd content on hightemperature mechanical properties of Mg-Gd-Y-Zr alloy[J].Materials Science&Engineering A,2016,651:840-847.
• [3]董丽君,夏长清,周岩.稀土元素Gd对Mg-Y-Zr合金组织和高温力学性能的影响[J].铸造,2014,63(11):1149-1152.DONG Li-jun,XIA Chang-qing,ZHOU Yan.Effect of Gd on microstructure and high temperature mechanical properties of Mg-Y-Zr alloys[J].Foundry,2014,63(11):1149-1152.
• [4]吴文祥,靳丽,董杰,等.Mg-Gd-Y-Zr高强耐热镁合金的研究进展[J].中国有色金属学报,2011,21(11):2709-2718.WU Wen-xiang,JIN Li,DONG Jie,et al.Research progress of high strength and heat resistant Mg-Gd-Y-Zr alloys[J].The Chinese Journal of Nonferrous Metals,2011,21(11):2709-2718.
• [5]张丁非,张红菊,兰伟,等.高强镁合金的研究进展[J].材料热处理学报,2012,33(6):1-8.ZHANG Ding-fei,ZHANG Hong-ju,LAN Wei,et al.Some research progress of high-strength magnesium alloys[J].Transactions of Materials and Heattreatment,2012,33(6):1-8.
• [6]Yang Z,Duan H B,Wang Z H,et al.Effect of natural ageing onmicrostructure and mechanical properties of Mg-10Gd-2Y-0.8Zr alloy[J].Materials Science&Engineering A,2015,648:140-145.
• [7]王其龙,吴国华,侯正全,等.Mg-Gd-Y-Zr合金的高温时效行为研究[J].特种铸造及有色合金,2009,29(11):1053-1057.WANG Qi-long,WU Guo-hua,HOU Zheng-quan,et al.Elevated aging behavior of Mg-Gd-Y-Zr alloy[J].Special-cast and Non-ferrous Alloys,2009,29(11):1053-1057.
• [8]Jiang L K,Liu W C,Wu G H,et al.Effect of chemical composition on the microstructure,tensile properties and fatigue behavior of sand-cast Mg-GdY-Zr alloy[J].Materials Science&Engineering A,2014,612:293-301.
• [9]文丽华,吉泽升.耐热镁合金研究应用现状及强化机制[J].轻合金加工技术,2014,42(12):28-34.WEN Li-hua,JI Ze-sheng.Research and application of heat-resistant magnesium alloy and its strengthening mechanism[J].Light Alloy Fabrication Technology,2014,42(12):28-34.
• [10]Lin D,Wang L,Meng F Q,et al.Effects of second phases on fracture behavior of Mg-10Gd-3Y-0.5Zr alloy[J].Nonferrous Metals Society of China,2010,22(2):S421-S425.
• [11]付三玲.Mg-Gd(-Y-Sm-Zr)耐热镁合金组织和性能研究[D].西安:西安理工大学,2016.FU San-ling.Study on the microstructure and mechanical properties of Mg-Gd(-Y-Sm-Zr)heat resistant magnesium alloys[D].Xi’an:Xi’an University of Technology,2016.

文章评论(Comment)：