Influence of single-pass caliber rolling on the microstructural evolution and mechanical properties of Mg–10Gd binary alloy  

作　　者：H.Yu Z.K.Liu Y.Liu W.Yu Y.L.Xu C.Liu B.A.Jiang S.H.Park K.S.Shin 

机构地区：[1]Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology,School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,PR China [2]College of Materials Science and Engineering,Hunan University,Changsha 410082,PR China [3]School of Materials Science and Engineering,Hefei University of Technology,Hefei 200039,PR China [4]Baosteel Metal Co.,Ltd.,Shanghai 200940,PR China [5]PLA AAAAD,Hefei 230031,PR China [6]School of Materials Science and Engineering,Kyungpook National University,Daegu 41566,Republic of Korea [7]Department of Materials Science and Engineering,Seoul National University,08826,Republic of Korea

出　　处：《Journal of Magnesium and Alloys》2024年第12期5119-5131,共13页镁合金学报(英文)

基　　金：financial support from the National Natural Science Foundation of China(51701060,52001106);Hebei Province(E2022202158),the foundation of the Strengthening Program(2019-JCJQ-142-00)。

摘　　要：This study investigates the influence of varying rolling reduction on the evolution of microstructure and mechanical properties of Mg–10Gd(in wt%)alloys by caliber rolling(CR).By increasing the rolling reduction from 45%to 65%,a uniform bimodal structure is obtained in which coarse grains(CGs)larger than 10μm are surrounded by fine grains(FGs).The Mg–Gd alloy subjected to 65%reduction exhibits superior mechanical properties,i.e.yield strength(YS)of~424 MPa,ultimate tensile strength(UTS)of~500 MPa and elongation(El.)of~3.3%.The synergistic improvement in strength and ductility is primarily attributed to the combined effects of low-angle grain boundary(LAGB)strengthening,precipitation strengthening,and the coordinated deformation exhibited by the bimodal structure.In addition,caliber rolling also provides a novel approach for the design of Mg alloys with uniform bimodal structures that exhibit both high strength and ductility.

关 键 词：Mg–Gd alloy Caliber rolling Bimodal microstructure Mechanical properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG339[金属学及工艺—金属材料]