Effect of cross rolling on the microstructure and mechanical performance of a dual-phase structured Mg-8Li-6Zn-1Y(in wt.%)alloy  

作　　者：Dongliang Wang Daokui Xu Baojie Wang Changjian Yan Shuo Wang Xiangbo Xu Lan Zhang Cuilan Lu 

机构地区：[1]Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]Binzhou Institute of Technology,Binzhou 256606,China [4]Shandong Key Laboratory of Advanced Aluminium Materials and Technology,Binzhou 256606,China [5]School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China [6]Institute of Corrosion Science and Technology,Guangzhou 510070,China [7]Key Lab of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China

出　　处：《Journal of Materials Science & Technology》2024年第9期132-144,共13页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China Projects under Grant(Nos.52071220,U21A2049,51871211,51701129,and 51971054);China Postdoctoral Science Foundation(No.2023M733572);Liaoning Province’s project of“Revitalizing Liaoning Talents”(No.XLYC1907062);the Doctor Startup Fund of Natural Science Foundation Program of Liaoning Province(No.2019-BS-200);High level achievement construction project of Shenyang Ligong University(No.SYLUXM202105);Liaoning BaiQianWan Talents Program,the Domain Foundation of Equipment Advance Research of 13th Five-year Plan(No.61409220118);National Key Research and Development Program of China under Grant(Nos.2017YFB0702001 and 2016YFB0301105);the Innovation Fund of Institute of Metal Research(IMR),Chinese Academy of Sciences(CAS),the National Basic Research Program of China(973 Program)project under Grant No.2013CB632205;the Fundamental Research Fund for the Central Universities under Grant(No.N2009006);Bintech-IMR R&D Program(No.GYY-JSBU-2022–009).

摘　　要：The microstructure and mechanical performance of the unidirectionally and cross-directionally rolled Mg-8Li-6Zn-1Y(in wt.%)sheets have been investigated and compared.It reveals that after the unidirectional rolling(UR),the broken I-phase particles are aggregated at theα-Mg/β-Li phase interfaces.However,the cross-rolling(CR)process can not only severely break the bulk I-phase,but also cause the obviously uniform distribution of I-phase particles in the matrix phases.Moreover,the average grain size of the CR samples is 3.61μm and about 50%that of the UR samples.The maximum texture intensities ofα-Mg andβ-Li phases in the CR samples are slightly stronger than those in the UR samples.Tensile results demonstrate that the CR process can effectively enhance the tensile properties and remarkably reduce the mechanical anisotropy of the alloy.For the UR samples,the yield strength,ultimate tensile strength,and elongation ratio along the rolling direction(RD)are 164 MPa,198 MPa,and 16.4%,whereas those along the transverse direction(TD)are 157 MPa,185 MPa,and 22.0%,respectively.For the CR samples,their mechanical properties are basically the same and the mechanical anisotropy is almost eliminated.The yield strength,ultimate tensile strength,and elongation ratio along the cross-rolling direction 1(CRD1)and 2(CRD2)are respectively measured to be 181 MPa and 182 MPa,220 MPa and 218 MPa,20.6%and 20.7%.Failure analysis indicates that for the UR samples being tensile tested along the RD and TD,microcracks are preferentially initiated in the region of aggregated I-phase particles.For the CR samples being tensile tested along both two cross-rolling directions,the initiation of micro-cracks mainly occurs at the I-phase/matrix phase interfaces and in the interior of matrix phases.

关 键 词：Magnesium-lithium alloy Cross-rolling I-phase MICROSTRUCTURE Mechanical performance 

分 类 号：TG14[一般工业技术—材料科学与工程]