High strength and elongation of Mg-Gd-Nd-Zr alloy obtained by synergistic action of high-speed extrusion and short-time aging treatment  

作　　者：Simin Shen Guangxiao Ren Xijuan Cao Hongxia Wang Binshan Wang Jin Wang Lifei Wang Weili Cheng Kwangseon Shin 

机构地区：[1]College of Materials Science and Engineering,Shanxi Key Laboratory of Advanced Magnesium-Based Materials,Taiyuan University of Technology,Taiyuan,030024,China [2]Shanxi Jianghuai Heavy Industry Co.,Ltd.,Jincheng,048000,China [3]Institute of Superalloys Science and Technology,School of Materials Science and Engineering,Zhejiang University,Hangzhou,310027,China [4]Magnesium Technology Innovation Center,School of Materials Science and Engineering,Seoul National University,1 Gwanak-ro,Gwanak-gu,Seoul,08826,South Korea

出　　处：《Journal of Rare Earths》2024年第12期2196-2207,I0001,共13页稀土学报（英文版）

基　　金：Project supported by the Natural Science Foundation of Shanxi Province(20210302123135,202303021221143);Scientific and Technological Achievements Transformation Guidance Special Project of Shanxi Province(202104021301022,202204021301009);Central Government Guided Local Science and Technology Development Projects(YDZJSX20231B003,YDZJSX2021A010);National Natural Science Foundation of China(52374395)。

摘　　要：Magnesium-gadolinium(Mg-Gd)-based alloys have excellent high-temperature properties and the addition of two heterogeneous rare earth(RE)elements may promote the formation of secondary phase for better-strengthened properties.Herein,novel Mg-7Gd-2Nd-0.5Zr(wt%)alloys were prepared by synergistic reaction induced by high-speed extrusion(EX)and short-time aging treatment(AT).The microstructures,textures,and mechanical properties of the resulting alloys were then comprehensively studied by various analytical methods.The result reveals that the as-cast Mg-7Gd-2Nd-0.5Zr(wt%)alloy is composed of a-Mg matrix and Mg5(Gd,Nd)phase with bony and continuous networks at grain boundaries.The microstructure presents coarse deformed grains and fine recrystallized grains after high-speed EX,and formation of typical(0001)||ED extruded fiber texture and[1211]RE texture is observed.The EX22 sample exhibits more Mg5(Gd,Nd)precipitated phases,fuller DRXed grains,and shorter peak aging times than the EX9 sample.After the AT at 250℃,the proportion of deformed grains decreases due to static recrystallization,which leads to a reduction in the average grain size and weakening of the texture intensity.Therefore,combined effect of all strengthening mechanisms aids in achieving balance of high-strength and high-elongation for Mg-7Gd-2Nd-0.5Zr(wt%)alloy.The values of yield strength(YS),ultimate tensile strength(UTS),and elongation(EL)of EX22-A sample at room temperature are found to be 292.5 MPa,350.6 MPa,and 24.3%,respectively.Overall,this study provides relevant experimental basis and theoretical guidance for the development of high-strength Mg-RE alloys,which are useful for future consideration.

关 键 词：Mg-7Gd-2Nd-0.5Zr alloy High-speed extrusion Aging treatment Mechanical properties Rare earths 

分 类 号：TG146.22[一般工业技术—材料科学与工程]