稀土Y和Ce元素对铸造Mg-Al-Zn合金组织和性能的影响
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摘要
采用光学显微镜(OM)、扫描电镜(SEM)和能谱分析(EDS)、X射线衍射仪(XRD)等研究了稀土元素Y、Ce加入量对铸造Mg-Al-Zn合金组织和力学性能的影响,以期制备具有较高综合力学性能的稀土镁合金。结果表明:稀土元素Y和Ce的添加能够有效地细化镁合金的组织,β-Mg_(17)Al_(12)相由连续或半连续网状分布转变为弥散分布,生成的新稀土相Al_2Ce和Al_2Y有效地提高了铸造Mg-Al-Zn合金的力学性能,当合金中稀土加入量为0.6 mass%Y+1.2 mass%Ce时,其抗拉强度和断后伸长率分别为234 MPa和7.2%。
Effects of the content of rare earth element Y and Ce on microstructure and mechanical properties of cast Mg-Al-Zn alloy were studied by means of optical microscope(OM), scanning electron microscopy(SEM), energy dispersive spectrometic(EDS) analysis and X ray diffractometer(XRD), in order to prepare rare earth magnesium alloy with high mechanical properties. The results show that the addition of rare earth elements Y and Ce can effectively refine the microstructure of the Mg-Al-Zn magnesium alloy, and the β-Mg_(17)Al_(12) phase changes from continuous or semi-continuous reticulated distribution to dispersion distribution. The mechanical properties of the cast Mg-Al-Zn alloy are improved effectively by the new rare earth phase Al_2Ce and Al_2Y, and the tensile strength and the elongation after fracture of the cast Mg-Al-Zn alloy are 234 MPa and 7.2% respectively when the amount of rare earth in the alloy is 0.6 mass% Y and 1.2 mass% Ce.
Effects of the content of rare earth element Y and Ce on microstructure and mechanical properties of cast Mg-Al-Zn alloy were studied by means of optical microscope(OM), scanning electron microscopy(SEM), energy dispersive spectrometic(EDS) analysis and X ray diffractometer(XRD), in order to prepare rare earth magnesium alloy with high mechanical properties. The results show that the addition of rare earth elements Y and Ce can effectively refine the microstructure of the Mg-Al-Zn magnesium alloy, and the β-Mg_(17)Al_(12) phase changes from continuous or semi-continuous reticulated distribution to dispersion distribution. The mechanical properties of the cast Mg-Al-Zn alloy are improved effectively by the new rare earth phase Al_2Ce and Al_2Y, and the tensile strength and the elongation after fracture of the cast Mg-Al-Zn alloy are 234 MPa and 7.2% respectively when the amount of rare earth in the alloy is 0.6 mass% Y and 1.2 mass% Ce.
引文
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[2] 胡文鑫,杨正华,陈国华,等.稀土元素对镁合金组织结构与性能影响的研究进展[J].稀土,2014,35(5):89-95.HU Wen-xin,YANG Zheng-hua,CHEN Guo-hua,et al.Research progress in influence of rare earth on microstructure and mechanical properties of magnesium[J].Chinese Rare Earths,2014,35 (5):89-95.
[3] Ding W J,Jin L,Wu W X,et al.Texture and texture optimization of wrought Mg alloy[J].The Chinese Journal of Nonferrous Metals,2011,21(10):2371-2381.
[4] Chaubey A K,Scudino S,Prashanth K G,et al.Microstructure and mechanical properties of Mg-Al-based alloy modified with cerium[J].Materials Science and Engineering,2015,625:46-49.
[5] 张景怀,唐定骧,张洪杰,等.稀土元素在镁合金中的作用及其应用[J].稀有金属,2008,32(5):659-667.ZHANG Jing-huai,TANG Ding-xiang,ZHANG Hong-jie,et al.Effect and application of rare earth element in magnesium alloys[J].Chinese Journal of Rare Metals,2008,32(5):659-667.
[6] 潘复生.镁及镁合金[A].中国新材料产业发展报告(2004)[C]//中国材料研究学会,2004.Pan Fu-sheng.Magnesium and Magnesium Alloys[A].China New Material Industry Development Report (2004)[C]//China Society of Materials Research,2004.
[7] 辛明德,吉泽升.稀土元素在铸造镁合金中应用的研究现状及其发展趋势[J].中国稀土学报,2010,28(6):643-653.XIN Ming-de,JI Ze-sheng.Research status and development trend of rare earth elements in cast magnesium alloys[J].Journal of the Chinese Society of Rare Earths,2010,28(6):643-653.
[8] Luo A A.Magnesium casting technology for structural applications[J].Journal of Magnesium and Alloys,2013,1(1):2-22.
[9] 李高林,文九巴,贺俊光,等.稀土元素Nd对AZ80镁合金组织及耐蚀性能的影响[J].材料热处理学报,2013,34(12):53-58.LI Gao-lin,Wen Jiu-ba,HE Jun-guang,et al.Effect of Nd addition on microstructure and corrosion resistance of AZ80 magnesium alloys[J].Transactions of Materials and Heat Treatment,2013,34(12):53-58.
[10] 朱琼,房灿峰,李乃朴,等.稀土元素Gd、Nd对AZ80镁合金组织和力学性能的影响[J].稀有金属材料与工程,2013,42(4):771-775.ZHU Qiong,FANG Can-feng,LI Nai-pu,et al.Effects of rare earth elements Gd and Nd on microstructure and mechanical properties of AZ80 magnesium alloy[J].Rare Metal Materials and Engineering,2013,42(4):771-775.
[11] 陈巧旺,汤爱涛,潘复生,等.高性能铸造稀土镁合金的发展[J].材料导报,2016,30(9):1-8.CHEN Qiao-wang,TANG Ai-tao,PAN Fu-sheng,et al.High performance cast magnesium rare-earth alloys:retrospect and prospect[J].Materials Review,2016,30(9):1-8.
[12] 盛夏.钙与钇对铸态AZ91D镁合金组织与性能的影响[D].哈尔滨:哈尔滨工业大学,2015.SHENG Xia.Effects of Ca and Y on microstructure and properties of as cast AZ91D magnesium alloy[D].Harbin:Harbin Institute of Technology,2015.
[13] 赵鸿金,李涛涛,杨正斌,等.元素Y和Ce在镁中存在状态及其热力学分析[J].材料热处理学报,2015,36(11):19-24.ZHAO Hong-jin,LI Tao-tao,YANG Zheng-bin,et al.Existence and thermodynamic analysis of Y and Ce in magnesium alloy[J].Transactions of Materials and Heat Treatment,2015,36(11):19-24.
[14] Tekumalla S,Seetharaman S,Almajid A,et al.Mechanical properties of magnesium-rare earth alloy systems:A review[J].Metals,2014,5(1):1-39.
[15] 房大庆,梁超,张克维,等.Sm对挤压Mg-6Al-1.0Ca-0.5Mn镁合金微观组织及力学性能的影响[J].稀有金属材料与工程,2017,46(4):1110-1113.FANG Da-qing,LIANG Chao,ZHANG Ke-wei,et al.Effects of Sm on microstructure and mechanical properties of extruded Mg-6Al-1.0Ca-0.5Mn magnesium alloys[J].Rare Metal Materials and Engineering,2017,46(4):1110-1113.
[16] 范晋平,房璐璐,许并社.微量La对Mg-8Al-4Sr-1Y合金组织和性能的影响[J].材料热处理学报,2015,36(3):125-129.FAN Jin-ping,FANG Lu-lu,XU Bing-she.Effect of trace element La on microstructure and properties of Mg-8Al-4Sr-1Y alloy[J].Transactions of Materials and Heat Treatment,2015,36(3):125-129.
[17] 王军,朱秀荣,徐永东,等.稀土Ce和Y对AZ80镁合金组织和力学性能的影响[J].中国有色金属学报,2014,24(1):25-35.WANG Jun,ZHU Xiu-rong,XU Yong-dong,et al.Effects of rare earth Ce and Y on microstructure and mechanical properties of AZ80 Mg alloys[J].The Chinese Journal of Nonferrous Metals,2014,24(1):25-35.