Microstructure and Mechanical Property of the Large Cross-Sectioned Mg-Gd-Y-Zn-Zr Alloy Produced by Small Extrusion Ratio  

作　　者：Sen Wang Hucheng Pan Caixia Jiang Zhihao Zeng Zhen Pan Weineng Tang Chubin Yang Yuping Ren Gaowu Qin 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),College of Materials Science and Engineering,Northeastern University,Shenyang,110819,China [2]Mg and Mg Alloy Institute,Technology Center,Baosteel Metal Co.,Ltd,China Baowu Steel Group,Shanghai,200940,China [3]Jiangxi Provincial Engineering Research Center for Magnesium Alloy,Gannan Normal University,Ganzhou,341000,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第6期999-1006,共8页金属学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFB3701000);the National Natural Science Foundation of China(Nos.U2167213,51971053);H.C.Pan acknowledges the financial assistance from the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2019-2021QNRC001-003);the fund from the Fundamental Research Funds for the Central Universities(N2202020).

摘　　要：In this work,the microstructure and mechanical properties of large cross-sectioned Mg-9Gd-3Y-1.2Zn-0.5Zr(VWZ931)samples produced by the small extrusion ratio has been investigated.The as-extruded VWZ931 sample with diameter of~30 mm can exhibit the high yield strength(YS)of 339 MPa,ultimate tensile strength(UTS)of 387 MPa and elongation of 8.2%,respectively.After peak-aged,the YS and UTS of the Mg samples were significantly increased to 435 MPa and 467 MPa.The small extrusion ratio leads to the low fraction of dynamic recrystallized(DRX)grains in VWZ931 sample,and the texture hardening effect can be fully utilized to achieve high strength.The combined effect of precipitation strengthening due to the long-period stacking ordered phases and theβ′phase,grain boundary strengthening due to the fine DRX grains,heterogeneous deformation-induced strengthening caused by bimodal microstructure,can together contribute to the high strength of present Mg alloy.The findings can shed light on designing other large-sized Mg wrought alloys with high mechanical performance.

关 键 词：Mg-RE alloy Mechanical property Bimodal grains Texture hardening 

分 类 号：TG376[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]