铸态Mg-xGd-2Y-0.5Zr镁合金的组织和力学性能
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摘要
采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、电子拉伸实验机等研究了铸态Mg-xGd-2Y-0.5Z合金的组织、微区成分、物相、晶格常数变化以及力学性能。结果表明:铸态Mg-xGd-2Y-0.5Zr镁合金组织主要由α-Mg、Mg_5Gd和Mg_(24)Y_5相组成,稀土元素Gd、Y主要富集在枝晶间;Gd的添加能够引起α-Mg晶格产生畸变,改变合金的晶格常数,导致晶轴比c/a减小,提高铸态Mg-xGd-2Y-0.5Zr合金的力学性能。当Gd的添加量为13%时,合金的抗拉强度和伸长率达到最大值,分别为236 MPa和3.09%。
Microstructure, microcomposition, phase, lattice constant and mechanical properties of as-cast Mg-xGd-2 Y-0.5 Z alloys were studied by means of scanning electron microscopy(SEM), energy dispersive spectrometer(EDS) analysis, X-ray diffractometer(XRD) and electronic tensile testing machine. The results show that the microstructure of the as-cast Mg-xGd-2 Y-0.5 Zr magnesium alloys is mainly composed of α-Mg,Mg_5Gd and Mg_(24)Y_5 phases, and the rare earth elements Gd and Y are mainly enriched in the dendrite. The addition of Gd can cause the distortion of α-Mg lattice, change the lattice constant of the alloy, decrease the axis ratio of c/a, and improve the mechanical properties of the the as-cast Mg-xGd-2 Y-0.5 Zr alloys. When the addition of Gd is 13%, the tensile strength and elongation of the alloy reach the maximum value of 236 MPa and 3.09%, respectively.
Microstructure, microcomposition, phase, lattice constant and mechanical properties of as-cast Mg-xGd-2 Y-0.5 Z alloys were studied by means of scanning electron microscopy(SEM), energy dispersive spectrometer(EDS) analysis, X-ray diffractometer(XRD) and electronic tensile testing machine. The results show that the microstructure of the as-cast Mg-xGd-2 Y-0.5 Zr magnesium alloys is mainly composed of α-Mg,Mg_5Gd and Mg_(24)Y_5 phases, and the rare earth elements Gd and Y are mainly enriched in the dendrite. The addition of Gd can cause the distortion of α-Mg lattice, change the lattice constant of the alloy, decrease the axis ratio of c/a, and improve the mechanical properties of the the as-cast Mg-xGd-2 Y-0.5 Zr alloys. When the addition of Gd is 13%, the tensile strength and elongation of the alloy reach the maximum value of 236 MPa and 3.09%, respectively.
引文
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[4] Zhang G D,Li X G,Ma M L,et al.Homogenization heat treatment of Mg-7.68Gd-4.88Y-1.32Nd-0.63Al-0.05Zr alloy[J].Journal of Rare Earths,2014,32(5):445-450.
[5] Xue Z Y,Ren Y J,Luo W B,et al.Effect of aging treatment on the precipitation behavior and mechanical properties of Mg-9Gd-3Y-1.5Zn-0.5Zr alloy[J].Journal of Materials Engineering and Performance,2017,26(7):1-10.
[6] 付三玲,李全安,井晓天,等.热处理对Mg-12Gd-3Y-Sm-0.5Zr 合金组织和性能的影响[J].材料热处理学报,2014,35(5):44-48.FU San-ling,LI Quan-an,JING Xiao-tian,et al.Effects of heat treatment on microstructure and properties of Mg-12Gd-3Y-Sm-0.5Zr alloy[J].Transactions of Materials and Heat Treatment,2014,35(5):44-48.
[7] Yang Z,Duan H B,Wang Z H,et al.Effect of natural ageing on microstructure and mechanical properties of Mg-10Gd-2Y-0.8Zr alloy[J].Materials Science and Engineering A,2015,648:140-145.
[8] Li J L,Zhang N,Wang X X,et al.Effect of solution treatment on the microstructure and mechanical properties of sand-cast Mg-9Gd-4Y-0.5Zr alloy[J].Acta Metallurgica Sinica(English letters),2018,31(2):189-198.
[9] Shi W J,Zhang Z M,Meng M,et al.Effects of homogenization treatment on microstructure and elongation of the Mg-13Gd-4Y-2Zn-0.6Zr alloy[J].Materials Research Express,2018,5(1):1-8.
[10] 陈晓亚,李全安,陈君,等.Gd含量对Mg-Gd-Y-Zr合金组织和性能的影响[J].材料热处理学报,2017,38(11):21-27.CHEN Xiao-ya,LI Quan-an,CHEN Jun,et al.Effect of Gd content on microstructure and properties of Mg-Gd-Y-Zr alloy[J].Transactions of Materials and Heat Treatment,2017,38(11):21-27.
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[12] Ning Z L,Liu H H,Cao F Y,et al.The effect of grain size on the tensile and creep properties of Mg-2.6Nd-0.35Zn-xZr alloys at 250 ℃[J].Materials Science and Engineering A,2013,560:163-169.
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[14] 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.
[15] 许娟,李鹏飞,郭锋.热处理对AZ91D镁合金相结构的影响[J].材料热处理学报,2011,32(4):30-33.XU Juan,LI Peng-fei,GUO Feng.Effect of heat treatment on microstructure of AZ91D alloy[J].Transactions of Materials and Heat Treatment,2011,32(4):30-33.
[16] Wan D Q,Wang J C,Yang G C.A study of the effect of Y on the mechanical properties,damping properties of high damping Mg-0.6%Zr based alloys[J].Materials Science and Engineering A,2009,517(1/2):114-117.
[17] Hu Y B,Deng J,Zhao C,et al.Microstructure and mechanical properties of as-quenched Mg-Gd-Zr alloys[J].Transactions of Nonferrous Metals Society of China,2011,21(4):732-738.
[18] Wang X D,Du W B,Liu K,et al.Microstructure,tensile properties and creep behaviors of as-cast Mg-2Al-1Zn-xGd (x=1,2,3,and 4 wt%) alloys[J].Journal of Alloys and Compounds,2012,522(19):78-84.
[19] Yao H,Wen J B,Xiong Y,et al.Microstructures,mechanical properties and corrosion behavior of as-cast Mg-2.0Zn-0.5Zr-xGd (mass%) biodegradable alloys[J].Materials,2018,11(9):1-13.
[20] Wu J,Chiu Y L,Jones I P.Effect of Gd on the microstructure of as-cast Mg-4.2Zn-0.8Y (at%) alloys[J].Journal of Alloys and Compounds,2016,661:455-460.