申广鑫;张代东;张晓茹;房大庆;刘宝胜;柴跃生;

• 1:太原科技大学材料科学与工程学院
• 2:吉林大学材料科学与工程学院
• 3:西安交通大学材料科学与工程学院

摘要(Abstract)：

采用OM, XRD, SEM和EDS等试验手段研究了Zn对稀土镁合金Mg-4Y-1Ca(%,质量分数)微观组织和力学性能的影响。结果表明:随着Zn (x=1%, 3%, 5%)的加入, Mg-4Y-1Ca合金中生成的Mg_(24)Y_5二元相逐步转变为Mg_3Y_2Zn_3(W相)+Mg_(12)YZn(X相)三元相,铸态组织细化,第二相沿晶界成网状分布;经热挤压变形后,合金再结晶后晶粒细化明显,第二相弥散分布于基体和晶界上,强度提高的同时伸长率也获得较大提升,其中Mg-4Y-1Ca-5Zn合金表现最为显著。得益于Zn添加对再结晶晶粒细化和W相、 X相弥散强化的共同作用, Mg-4Y-1Ca-5Zn合金经热挤压处理后具有较佳的综合力学性能,屈服强度、抗拉强度和伸长率分别达到198 MPa, 271 MPa和24.6%。

关键词(KeyWords)： Mg-4Y-1Ca-xZn(x=0%,1%,3%,5%)镁合金;微观组织;第二相;晶粒细化;力学性能

Abstract:

Keywords:

基金项目(Foundation): 中央引导地方科技发展专项资金项目(YDZX20181400002967);; 山西省自然科学基金项目(201701D121041)资助

作者(Author): 申广鑫;张代东;张晓茹;房大庆;刘宝胜;柴跃生;

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DOI:

参考文献(References)：

• [1] Jun J H,Park B K,Kim J M,Kim K T,Jung W J.Effects of Ca addition on microstructure and mechanical properties of Mg-RE-Zn casting alloy [J].Mater.Sci.Forum.,2005,488-489:107.
• [2] Ding W C,Chen Y G,Xiao S F,Cui Z M,Cheng P.Microstructure and mechanical properties of as-cast Mg-5Sn-2Ce-xZn alloys [J].J.Rare Earths,2017,35(6):585.
• [3] 贵云玮,李全安,周耀,陈晓亚.热处理对Mg-11Gd-2Y-5Sm-0.5Zr合金组织和力学性能的影响 [J].中国稀土学报,2017,35(6):776.Gui Y W,Li Q A,Zhou Y,Chen X Y.Effect of heat treatment on microstructure and mechanical properties of Mg-11Gd-2Y-5Sm-0.5Zr alloy [J].Journal of the Chinese Society of Rare Earths,2017,35(6):776.
• [4] 吕文泉,王锦程,杨跃双,李俊杰.高强镁合金的研究现状及发展趋势 [J].材料导报,2012,26(5):105.Lü W Q,Wang J C,Yang Y S,Li J J.Situation and development trend of high-strength magnesium alloy research [J].Materials Review,2012,26(5):105.
• [5] Sakamoto M,Akiyama S,Ogi K.Suppression of ignition and burning of molten Mg alloys by Ca bearing stable oxide film [J].J.Mater.Sci.Lett.,1997,16(12):1048.
• [6] Chen T J,Zhang D H,Wang W,Ma Y,Hao Y.Effects of Zn content on microstructures and mechanical properties of Mg-Zn-RE-Sn-Zr-Ca alloys [J].Mater.Sci.Eng.A,2014,607:17.
• [7] Lee Y C,Dahle A K,Stjohn D H.The role of solute in grain refinement of magnesium [J].Metall.Mater.Trans.A,2000,31(11):2895.
• [8] 刘宗昌,李琳,王海燕.网状碳化物和粗晶的辨识及其消除工艺[J].热处理技术与装备,2018,39(3):1.Liu Z C,Li L,Wang H Y.Identification and elimination process of network carbide and coarse grain [J].Heat Treatment Technology and Equipment,2018,39(3):1.
• [9] Saunders N.Phase Diagram Calculations for Ni-Based Superalloys [C].Champion,Pennsylvania:TMS,1996.101.
• [10] 陈晶,李少华,颜飞雪,王植杰.JMatPro软件在GH3039真空扩散焊工艺研究中的应用 [J].热加工工艺,2018,47(11):232.Chen J,Li S H,Yan F X,Wang Z J.Application of JMatPro Software in research of GH3039 vacuum diffusion welding process [J].Hot Working Technology,2018,47(11):232.
• [11] Zhang Z Q,Liu X,Wang Z K,Le Q C,Hu W Y,Bao L,Cui J Z.Effects of phase composition and content on the microstructures and mechanical properties of high strength Mg-Y-Zn-Zr alloys [J].Mater.Des.,2015,88:915.
• [12] Luo S Q,Tang A T,Pan F S,Song K,Wang W Q.Effect of mole ratio of Y to Zn on phase constituent of Mg-Zn-Zr-Y alloys [J].Nonferrous Met.Soc.China,2011,21(4):795.
• [13] Xu D K,Tang W N,Liu L,Xu Y B,Han E H.Effect of W-phase on the mechanical properties of as-cast Mg-Zn-Y-Zr alloys [J].J.Alloys Compd.,2008,461(1-2):248.
• [14] Fan R Y,Liu Z L,Liu X Q,Liu Y,Yin H,Li J.Effects of Zn content on microstructures and mechanical properties of as-cast Mg-4Y-xZn alloys [J].J.Mater.Res.,2017,32(18):1.
• [15] Qi F G,Zhang D F,Zhang X H,Pan F S.Effect of Y addition on microstructure and mechanical properties of Mg-Zn-Mn alloy [J].Nonferrous Met.Soc.China,2014,24(5):1352.
• [16] Hall E O.The Deformation and Ageing of Mild Steel:III Discussion of Results [J].Proc.Phys.Soc.London,Sect.B,1951,64(9):747.
• [17] Petch N J.The Cleavage Strength of Polycrystals [J].J.Iron Steel Inst.,1953,174(1):25.
• [18] Kim W J,Jeong H G,Jeong H T.Achieving high strength and high ductility in magnesium alloys using severe plastic deformation combined with low-temperature aging [J].Scr.Mater.,2009,61(11):1040.
• [19] Chen T J,Zhang D H,Wang W,Ma Y,Hao Y.Effects of Zn content on microstructures and mechanical properties of Mg-Zn-RE-Sn-Zr-Ca alloys [J].Mater.Sci.Eng.A,2014,607:17.
• [20] Li M,Zhang K,Li X G,Yuan J W,Li Y J,Ma M L,Shi G L,Li T,Liu J B.Effect of Zn on the microstructure and mechanical properties of as-cast Mg-7Gd-3Y-1Nd-0.5Zr alloy [J].Mater.Sci.Eng.A,2015,638:46.
• [21] Liu K,Zhang J,Lu H,Tang D,Rokhlin L L,Elkin F M,Meng J.Effect of the long periodic stacking structure and W-phase on the microstructures and mechanical properties of the Mg-8Gd-Zn-0.4Zr alloys [J].Mater.Des.,2010,31(1):210.
• [22] 胡赓祥,蔡珣,戎咏华.材料科学基础 [M].上海:上海交通大学出版社,2000.Hu G X,Cai X,Rong Y H.Fundamentals of Materials Science [M].Shanghai:Shanghai Jiao Tong University Press,2000.