An ultra-high strength and toughness as-cast Mg-10Gd-1.7Y-1Zn-0.5Zr alloy  

作　　者：Haijun Wang Renju Cheng Bin Jiang Mingbo Yang Daiyi Deng Zhihua Dong Jiangfeng Song Chuntang Yu Linjiang Chai Fusheng Pan 

机构地区：[1]College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China [2]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [3]Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China

出　　处：《Journal of Magnesium and Alloys》2025年第2期894-901,共8页镁合金学报(英文)

基　　金：supported by the National Natural Science Foundation of China(U21A2048,U2037601,U2241231);the Guangdong Major Project of Basic and Applied Basic Research(2020B0301030006);the National Key Research and Development Program of China(2021YFB3701100);the Science and Technology Research Program of the Chongqing Municipal Education Commission(KJZD-K202201108,KJQN202201136);The Cultivation Project of CQUT for Research and Innovation Group(2023TDZ006);the Academician in Chongqing Leaded Guidance Project of Science and Technology Innovation(CSTB2023YSZX-JCX0006).

摘　　要：An ultra-high strength and toughness as-cast Mg-10Gd-1.7Y-1Zn-0.5Zr(wt.%)alloy was prepared via special ultrasonic melt treatment,and the peak-aged(200℃for 48 h)ultimate tensile strength(UTS),yield strength(YS)and elongation(EL)at room temperature reaches 430 MPa,324 MPa,and 13.6%,respectively.The ultrasonic treatment during semi-solid conditions refines the grains and hinders the growth of the divorced eutectic phases(α-Mg+Mg_(3)Gd)during casting.During the solution treatment,the refined Mg_(3)Gd phase suppresses the formation of cubic-shaped GdY phases and block 14H long period stacking structure(14H-LPSO)phases,and further increases solute concentration in the matrix.More solute atoms promote the growth ofβ′plates with an increased aspect ratio of 8:1,which can increase critical resolved shear stress(CRSS),YS and work hardening rate.It is that found the aspect ratio ofβ′plates are mainly responsible for the improvement in the strength of the alloy under the same composition and heat treatment conditions.

关 键 词：Magnesium alloys Mechanical properties Strengthening mechanism Ultrasonic treatment 

分 类 号：TG146.22[一般工业技术—材料科学与工程]