Cu和Ce对Mg-1.5Zn-0.2Mn合金组织和力学性能的影响
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摘要
本文通过光学显微镜、拉伸试验机对比研究了Ce、Cu元素对Mg-1.5Zn-0.2Mn合金组织和力学性能的影响。研究结果表明,Cu、Ce元素对铸态Mg-1.5Zn-0.2Mn合金晶粒细化效果并不明显,但经350℃热变形后,能显著细化挤压态Mg-1.5Zn-0.2Mn合金的晶粒组织,其中Ce细化晶粒的效果更加明显,而且Ce能够抑制合金的动态再结晶。此外,Cu、Ce元素的添加均能提高Mg-1.5Zn-0.2Mn合金沿ED和TD方向的屈服强度和抗拉强度,其中Ce元素提高幅度更大,Mg-1.5Zn-0.2Mn-0.2Ce合金ED、TD方向屈服强度分别为185 MPa和162 MPa。与此同时,这两种元素还可以改善Mg-1.5Zn-0.2Mn合金板材强度的各向异性,其中Cu元素的改善效果更明显。
The effects of Ce and Cu on microstructure and mechanical properties of Mg-1. 5 Zn-0. 2 Mn alloy were investigated by means of optical microscope( OM) and tensile testing machine. The results show that the addition of Ce and Cu play a negligible effect on the grain size of the as-cast Mg-1. 5 Zn-0. 2 Mn alloy,but could significantly refine the grain structure of the as-extruded alloy. Moreover,the Ce addition could suppress the recrystallization during hot deformation. The strength in ED and TD direction was enhanced by the addition of Ce or Cu and a better mechanical properties could be achieved in Ce-bearing alloy. After 350 ℃ extrusion,the Ce-containing alloy exhibits the best yield strength in ED( 185 MPa) and TD( 162 MPa) direction. In the meantime,the addition of Cu and Ce can improve the anisotropy of strength in Mg-1. 5 Zn-0. 2 Mn alloy,and the effect of improving sheet anisotropy by adding Cu is more obvious.
The effects of Ce and Cu on microstructure and mechanical properties of Mg-1. 5 Zn-0. 2 Mn alloy were investigated by means of optical microscope( OM) and tensile testing machine. The results show that the addition of Ce and Cu play a negligible effect on the grain size of the as-cast Mg-1. 5 Zn-0. 2 Mn alloy,but could significantly refine the grain structure of the as-extruded alloy. Moreover,the Ce addition could suppress the recrystallization during hot deformation. The strength in ED and TD direction was enhanced by the addition of Ce or Cu and a better mechanical properties could be achieved in Ce-bearing alloy. After 350 ℃ extrusion,the Ce-containing alloy exhibits the best yield strength in ED( 185 MPa) and TD( 162 MPa) direction. In the meantime,the addition of Cu and Ce can improve the anisotropy of strength in Mg-1. 5 Zn-0. 2 Mn alloy,and the effect of improving sheet anisotropy by adding Cu is more obvious.
引文
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[3]王慧敏,陈振华,严红革,等.镁合金的热处理[J].金属热处理,2005,30(11):49-54.Wang Huimin,Chen Zhenhua,Yan Hongge,et al.Heat treatment of magnesium alloys[J].Heat Treatment of Metals,2005,30(11):49-54.
[4]Chen X,Geng Y,Pan F.Research Progress in Magnesium Alloys as Functional Materials[J].Rare Metal Materials and Engineering,2016,45(9):2269-2274.
[5]Hirsch J,Al-Samman T.Superior light metals by texture engineering:Optimized aluminum and magnesium alloys for automotive applications[J].Acta Materialia,2013,61(3):818-843.
[6]She J,Pan F,Zhang J,et al.Microstructure and mechanical properties of Mg-Al-Sn extruded alloys[J].Journal of Alloys and Compounds,2016,657:893-905.
[7]Yang Q,Jiang B,Jiang W,et al.Evolution of microstructure and mechanical properties of Mg-Mn-Ce alloys under hot extrusion[J].Materials Science and Engineering A,2015,628:143-148.
[8]Yang Q,Jiang B,Li X,et al.Microstructure and mechanical behavior of the Mg-Mn-Ce magnesium alloy sheets[J].Journal of Magnesium and Alloys,2014,2(1):8-12.
[9]马昭,江海涛,蔡正旭,等.Mg-1.5Zn-0.2Ce合金热轧退火后的微观组织及成形性能[J].金属热处理,2014(7):19-22.Ma Zhao,Jiang Haitao,Cai Zhengxu,et al.Microstructure and formability of rolled and annealed Mg-1.5Zn-0.2Ce alloy[J].Heat Treatment of Metals,2014(7):19-22.
[10]Gall S,Coelho R S,Müller S,et al.Mechanical properties and forming behavior of extruded AZ31 and ME21 magnesium alloy sheets[J].Materials Science and Engineering A,2013,579(2):180-187.
[11]Sanjari M,Farzadfar S F,Sakai T,et al.Microstructure and texture evolution of Mg3Zn3Ce magnesium alloys sheets and associated restoration mechanisms during annealing[J].Materials Science and Engineering A,2013,561(3):191-202.
[12]齐福刚.Sn和Ce对Mg-Zn-Mn高强变形镁合金组织和性能的影响[D].重庆:重庆大学,2012:1-167.
[13]Stanford N.Micro-alloying Mg with Y,Ce,Gd and La for texture modification—A comparative study[J].Materials Science and Engineering A,2010,527(10/11):2669-2677.
[14]Stanford N,Atwell D,Beer A,et al.Effect of microalloying with rareearth elements on the texture of extruded magnesium-based alloys[J].Scripta Materialia,2008,59(7):772-775.
[15]Zhang D F,Fu-Gang Q I,Lan W,et al.Effects of Ce addition on microstructure and mechanical properties of Mg-6Zn-1Mn alloy[J].Transactions of Nonferrous Metals Society of China,2011,56(4):589-593.
[16]Zhu H M,Sha G,Liu J W,et al.Microstructure and mechanical properties of Mg-6Zn-x Cu-0.6Zr(wt.%)alloys[J].Journal of Alloys and Compounds,2011,509(8):3526-3531.
[17]Zhu H M,Luo C P,Liu J W,et al.Growth twinning behavior of cast Mg-Zn-Cu-Zr alloys[J].Transactions of Nonferrous Metals Society of China,2014,24(2):316-320.
[18]Li X,Al-Samman T,Mu S,et al.Texture and microstructure development during hot deformation of ME20 magnesium alloy:Experiments and simulations[J].Materials Science and Engineering A,2011,528(27):7915-7925.
[19]Villars P,Prince A,Okamoto H.Handbook of Ternary Alloy Phase Diagrams[M].ASM International,1995.
[20]Bohlen J,Nürnberg M R,Senn J W,et al.The texture and anisotropy of magnesium-zinc-rare earth alloy sheets[J].Acta Materialia,2007,55(6):2101-2112.
[21]Jata K V,Hopkins A K,Rioja R J.The anisotropy and texture of AlLi alloys[J].Materials Science Forum,1996,217-222:647-652.
[22]Singh R K,Singh A K,Eswara Prasad N.Texture and mechanical property anisotropy in an Al-Mg-Si-Cu alloy[J].Materials Science and Engineering A,2000,277:114-122.