Zn添加对挤压态Mg-16Gd-xZn合金微观组织的影响
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摘要
利用真空感应熔炼-反向热挤压法制备了Mg-16Gd-xZn(x=0,0.5,1.0,2.0,wt.%)4组合金,用X射线衍射,激光扫描共聚焦显微镜、扫描电镜、透射电镜、能谱分析仪及EBSD技术研究了Zn元素添加对挤压态Mg-16Gd-xZn合金微观组织的影响。研究结果表明:Zn元素添加可以有效地细化合金晶粒,平均晶粒尺寸由4.8±2.3μm细化至3.3±1.4μm。二元Mg-16Gd合金由α-Mg与Mg5Gd两相构成;当添加Zn至x=0.5、x=1.0时,两组合金均由α-Mg、Mg5Gd、(Mg,Zn)3Gd三相组成;而Zn添加至x=2.0时,合金由α-Mg与(Mg,Zn)3Gd两相构成。挤压态Mg-16Gd-2.0Zn合金内存在大量的片层状γ'强化相,沿着{0001}基面生长,与基体完全共格。
Mg-16Gd-xZn(x=0,0.5,1.0,2.0,wt.%) alloys were fabricated by vacuum induction melting-indirect hot extrusion,microstructure and texture were investigated by X-ray diffraction,laser scanning confocal microscope,scanning electron microscope,transmission electron microscope,energy dispersive spectrometer and electron back scattering diffraction.Results show that grains of these extruded alloys are considerably refined when the zinc addition,and the grain size decreases from 4.8 μm to 3.3 μm.Mg-16 Gd binary alloy consist of α-Mg solid solution and Mg5Gd phase;when adding zinc to x=0.5,x=1.0,the alloys all consist of α-Mg,Mg5Gd and(Mg,Zn)3Gd phase;and added Zn to x=2.0,the Mg-16 Gd-2.0 Zn alloy consist of α-Mg and(Mg,Zn)3Gd.There are a large number of lamellar γ' phase within the α-Mg matrix in the extruded Mg-16Gd-2.0Zn alloy,it formed as(0001)α plates and completely coherent with the α-Mg matrix.
Mg-16Gd-xZn(x=0,0.5,1.0,2.0,wt.%) alloys were fabricated by vacuum induction melting-indirect hot extrusion,microstructure and texture were investigated by X-ray diffraction,laser scanning confocal microscope,scanning electron microscope,transmission electron microscope,energy dispersive spectrometer and electron back scattering diffraction.Results show that grains of these extruded alloys are considerably refined when the zinc addition,and the grain size decreases from 4.8 μm to 3.3 μm.Mg-16 Gd binary alloy consist of α-Mg solid solution and Mg5Gd phase;when adding zinc to x=0.5,x=1.0,the alloys all consist of α-Mg,Mg5Gd and(Mg,Zn)3Gd phase;and added Zn to x=2.0,the Mg-16 Gd-2.0 Zn alloy consist of α-Mg and(Mg,Zn)3Gd.There are a large number of lamellar γ' phase within the α-Mg matrix in the extruded Mg-16Gd-2.0Zn alloy,it formed as(0001)α plates and completely coherent with the α-Mg matrix.
引文
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[3]Anyanwu I A,Kamado S,Kojima Y.Aging characteristics and high temperature tensile properties of Mg-Gd-Y-Zr alloys[J].Materials Transactions,2001,42(7):1206-1211.
[4]Anyanwu I A,Kamado S,Kojima Y.Creep properties of Mg-Gd-Y-Zr alloy[J].Materials Transactions,2001,42(7):1212-1218.
[5]蔡正旭,唐荻,江海涛,等.不同Gd含量对变形MgZn-Gd合金织构和室温成形性能的影响[J].稀有金属材料与工程,2013,42(10):2073-2078.Cai Z X,Tang D,Jiang H T,et al.Influence of Gd cconcentration on texture and stretch formability of rolled Mg-Zn-Gd alloys at room temperature[J].Rare Metal Materials and Engineering,2013,42(10):2073-2078.(in Chinese)
[6]Xie H B,Bai J Y,Pan H C,et al.Self-adapted clustering of solute atoms into a confined two-dimensional prismatic platelet with an ellipse-like quasi-unit cell[J].IUCr J,2018(5):823-829.
[7]Nie J F,Oh-ishi K,Gao X,et al.Solute segregation and precipitation in a creep-resistant Mg-Gd-Zn alloy[J].Acta Materialia,2008(56):6061-6076.
[8]曾小勤,吴玉娟,彭立明,等.Mg-Gd-Zn-Zr合金中的LPSO结构和时效相[J].金属学报,2010,46(9):1041-4046.Zeng X Q,Wu Y J,Peng L M,et al.LPSO Structure and aging phases in Mg-Gd-Zn-Zr alloy[J].Acta Metallurgica Sinica,2010,46(9):1041-4046.(in Chinese)
[9]Saito K,Nishijima M,Hiraga K.Stabilization of GuinierPreston zones in hexagonal close-packed Mg-Gd-Zn alloys studied by transmission electron microscopy[J].Materials Transactions,2010,51(9):1712-1714.
[10]Saitoa K,Yasuhara A,Hiraga K.Microstructural changes of Guinier-Preston zones in an Mg-1.5at%Gd-1at%Zn alloy studied by HAADF-STEM technique[J].Journal of Alloys and Compounds,2011(509):2031-2038.
[11]Zhang J S,Zhang W B,Ruan X Q,et al.Effect of zirconium on the microstructure and mechanical properties of long period stacking ordered Mg96Gd3Zn1 alloy[J].Materials Science&Engineering A,2013(560):847-850.
[12]Zhang J S,Zhang W B,Bian L P,et al.Study of MgGd-Zn-Zr alloys with long period stacking ordered structures[J].Materials Science&Engineering A,2013(585):268-276.
[13]Cao L J,Wu Y J,Peng L M,et al.Microstructure and tribological behavior of Mg-Gd-Zn-Zr alloy with LPSOstructure[J].Transactions of Nonferrous Metals.Society of China,2014,24(12):3785-3791.
[14]Srinivasan A,Huang Y,Mendis C L,et al.Investigations on microstructures,mechanical and corrosion properties of Mg-Gd-Zn alloys[J].Materials Science&Engineering A,2014(595):224-234.
[15]Grobner J,Kozlov A,Fang X Y,et al.Phase equilibria and transformations in ternary Mg-Gd-Zn alloys[J].Acta Materialia,2015(90):400-416.
[16]孟姣,薛烽,孙晶晶,等.Zn含量对Mg-Gd-Zn合金显微组织与力学性能的影响[J].稀有金属材料与工程,2015,44(10):2429-2434.Meng J,Xue F,Sun J J,et al.Effects of Zn addition on the microstructure and mechanical properties of Mg-GdZn alloys[J].Rare Metal Materials and Engineering,2015,44(10):2429-2434.(in Chinese)
[17]Li J C,He Z L,Fu P H,et al.Heat treatment and mechanical properties of a high-strength cast Mg-Gd-Zn alloy[J].Materials Science&Engineering A,2016(651):745-752.
[18]Li Z,Zheng J X,Chen B.Unravelling the structure ofγ″in Mg-Gd-Zn:An atomic-scale HAADF-STEM investigation[J].Materials Characterization,2016(120):345-348.
[19]Xie H B,Pan H C,Ren Y P,et al.Magnesium alloys strengthened by nanosaucer precipitates with confined new topologically close-packed structure[J].Crystal Growth&Design,2018(18):5866-5873.
[20]秦高梧,谢红波,潘虎成,等.一类介于晶体与准晶体之间的有序结构[J].金属学报,2018,54(11):1490-1502.Qin Gaowu,Xie Hongbo,Pan Hucheng,et al.A new class of ordered structure between crystals and quasicrystals[J].Acta Metallurgica Sinica,2018,54(11):1490-1502.(in Chinese)
[21]Liu H,Xue F,Bai J,et al.Effect of heat treatments on the microstructure and mechanical properties of an extruded Mg95.5Y3Zn1.5alloy[J].Materials Science&Engineering A,2013(585):261-267.
[22]Wang H L,Wang G J,Hu L X,et al.Effect of hot rolling on grain refining and mechanical properties of AZ40 magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2011,21(S2):229-234.