微量Ca对Mg-6Al-1Y-1Nd合金组织和性能的影响
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摘要
利用感应熔炼制备了不同Ca含量的Mg-6Al-1Y-1Nd-xCa(x=0、0.1、0.4、0.7)镁合金,采用光学金相显微镜、扫描电镜、X射线衍射分析、能谱分析和拉伸及蠕变力学性能等手段研究了微量Ca元素添加对Mg-6Al-1Y-1Nd镁合金显微组织和力学性能的影响。研究结果证实,添加微量的碱土元素Ca使得Mg-6Al-1Y-1Nd镁合金的显微组织明显得到细化,Mg-6Al-1Y-1Nd合金主要存在Al_2Y和Al_2Nd块状稀土析出相,Ca元素的添加使得该合金形成了呈条状和骨骼状的新析出相Al_2Ca。力学性能测试结果证实微量Ca元素添加能够显著提高Mg-6Al-1Y-1Nd镁合金在室温和高温条件下的强度和塑性,同时显著提升了该合金在150～200℃/70 MPa测试条件下的抗蠕变性能,表明Ca是Mg-6Al-1Y-1Nd镁合金重要强化添加元素。
Mg-6 Al-1Y-1Nd-xCa(x = 0,0.1,0.4,0.7) magnesium alloys were prepared through induction melting.Effect of minor content of Ca on microstructure and mechanical properties of Mg-6Al-1Y-1Nd alloy was investigated by using optical microscopyand scanning electron microscop,energy dispersive spectroscopy,X-ray diffraction and tensile and creep tests.The results show that the microstructure of Mg-6Al-1Y-1Nd magnesium alloy is evidently refined with the minor addition of alkaline earth element Ca.The block Al_2Y and Al_2Nd phases can be observed in the microstructure of Mg-6Al-1Y-1Nd alloy.With the addition of minor Ca in the alloy,the new rod and bone-shaped Al_2Ca phase can be clearly observed also.The minor addition of Ca can markedly improve the strength and ductility properties at room and high temperatures of Mg-6Al-1Y-1Nd-x Ca alloys.Moreover,the creep properties of Mg-6Al-1Y-1Nd alloy at 150-200 ℃/70 MPa test condition are remarkably improved with the minor Ca addition also.The tensile and creep properties of Mg-6Al-1Y-1Nd alloys are effectively improved by the addition of Ca,which can be attributed to the microstructure refinement and the strengthen effect of phases.
Mg-6 Al-1Y-1Nd-xCa(x = 0,0.1,0.4,0.7) magnesium alloys were prepared through induction melting.Effect of minor content of Ca on microstructure and mechanical properties of Mg-6Al-1Y-1Nd alloy was investigated by using optical microscopyand scanning electron microscop,energy dispersive spectroscopy,X-ray diffraction and tensile and creep tests.The results show that the microstructure of Mg-6Al-1Y-1Nd magnesium alloy is evidently refined with the minor addition of alkaline earth element Ca.The block Al_2Y and Al_2Nd phases can be observed in the microstructure of Mg-6Al-1Y-1Nd alloy.With the addition of minor Ca in the alloy,the new rod and bone-shaped Al_2Ca phase can be clearly observed also.The minor addition of Ca can markedly improve the strength and ductility properties at room and high temperatures of Mg-6Al-1Y-1Nd-x Ca alloys.Moreover,the creep properties of Mg-6Al-1Y-1Nd alloy at 150-200 ℃/70 MPa test condition are remarkably improved with the minor Ca addition also.The tensile and creep properties of Mg-6Al-1Y-1Nd alloys are effectively improved by the addition of Ca,which can be attributed to the microstructure refinement and the strengthen effect of phases.
引文
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[3]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 A,2015,625:46-49.
[4]Li K J,Li Q A,Jing X T,et al.Effects of Sm addition on microstructure and mechanical properties of Mg-6Al-0.6Zn alloy[J].Scripta Materialia,2009,60(12):1101-1104.
[5]Wang J,Fu J W,Dong X G,et al.Microstructure and mechanical properties of as-cast Mg-Al-Sn-Y-Nd alloy[J].Materials and Design,2015,36:432-437.
[6]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 Gaolin,Wen Jiuba,He Junguang,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.
[7]Zhao Z D,Chen Q,Wang Y B,et al.Microstructures and mechanical properties of AZ91D alloys with Y addition[J].Materials Science and Engineering A,2009,515:152-161.
[8]陈君,李全安,张清.钇对AZ61镁合金组织和性能的影响[J].中国稀土学报,2015,33(4):449-454.Chen Jun,Li Quan'an,Zhang Qing.Effect of yttrium on microstructure and properties of AZ61 magnesium alloy[J].Journal of the Chinese Society of Rare Earths,2015,33(4):449-454.
[9]李建宏,李全安,谢建昌,等.钇钕复合合金化对Mg-6Al合金力学性能的影响[J].材料热处理学报,2008,29(4):79-82.Li Jianhong,Li Quan'an,Xie Jianchang,et al.Effect of Y and Nd combined addition on mechanical properties of Mg-6Al alloy[J].Transactions of Materials and Heat Treatment,2008,29(4):79-82.
[10]高洪吾,胡晓菊,李长茂.RE元素Y和Nd对Mg-6Al合金显微组织的影响[J].特种铸造及有色合金,2004,14(6):29-31.Gao Hongwu,Hu Xiaoju,Li Changmao.Effects of RE elements Y and Nd on microstructure of Mg-6Al magnesium alloy[J].Special Casting and Nonferrous Alloys,2004,14(6):29-31.
[11]王小强,李全安,张兴渊.Y,Nd复合稀土对AZ81镁合金组织和力学性能的影响[J].稀有金属材料与工程,2008,37(1):62-65.Wang Xiaoqiang,Li Quan'an,Zhang Xingyuan.Effects of yttrium and neodymium on microstructure and mechanical properties of AZ81magnesium alloy[J].Rare Metal Materials and Engineering,2008,37(1):62-65.
[12]Feng C,Li M Z,Hou Y,et al.Effect of Ca on corrosion resistance behavior of as-cast AZ91 magnesium alloys[J].Rare Metal Materials and Engineering,2015,44(1):41-47.
[13]Son H,Lee J,Kim D,et al.Effects of samarium additions on the microstructure and mechanical properties of as-cast and hot-extruded Mg-5Al-3Ca-based alloys[J].Journal of Alloy Compdounds,2009,473:446-452.
[14]Shahzad M,Qureshi A H,Waqas H,et al.Influence of pre-and postextrusion heat treatments on microstructure and anisotropy of mechanical properties in a Mg-Al-Zn alloy[J].Materials and Design,2013,51:870-875.
[15]陈振华.耐热镁合金[M].北京:化学工业出版社,2004.
[16]张津.镁合金及应用[M].北京:化学工业出版社,2004.
[17]梁茜,刘志坚,董奇夺,等.合成工艺和添加钇对Mg-Li基复合材料铸锭质量的影响[J].中国稀土学报,2013,31(1):20-25.Liang Xi,Liu Zhijian,Dong Qiduo,et al.Effects of synthesis process and addition of yttrium on Mg-Li based composite materials[J].Journal of the Chinese Society of Rare Earths,2013,31(1):20-25.