Effect of icosahedral phase formation on the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li(in wt.%)based alloys  

作　　者：Shuo Wang Daokui Xu Dongliang Wang Zhiqiang Zhang Baojie Wang 

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

出　　处：《Journal of Magnesium and Alloys》2024年第1期225-236,共12页镁合金学报（英文）

基　　金：the National Natural Science Foundation of China Projects under Grant[Nos.51871211,U21A2049,52071220,51701129 and 51971054];Liaoning Province’s project of"Revitalizing Liaoning Talents"(XLYC1907062);the Doctor Startup Fund of Natural Science Foundation Program of Liaoning Province(No.2019-BS-200);the Strategic New Industry Development Special Foundation of Shenzhen(JCYJ20170306141749970);the funds of International Joint Laboratory for Light Alloys;Liaoning Bai Qian Wan Talents Program;the Domain Foundation of Equipment Advance Research of 13th Five-year Plan(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：Through exploring the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li and Mg-8%Li-6%Zn-1.2%Y alloys in a 0.1 M NaCl solution,it revealed that the SCC susceptibility index(I_(SCC))of the Mg-8%Li alloy was 47%,whilst the I_(SCC)of the Mg-8%Li-6%Zn-1.2%Y alloy was 68%.Surface,cross-sectional and fractography observations indicated that for the Mg-8%Li alloy,theα-Mg/β-Li interfaces acted as the preferential crack initiation sites and propagation paths during the SCC process.With regard to the Mg-8%Li-6%Zn-1.2%Y alloy,the crack initiation sites included the I-phase and the interfaces of I-phase/β-Li andα-Mg/β-Li,and the preferential propagation paths were the I-phase/β-Li andα-Mg/β-Li interfaces.Moreover,the SCC of the two alloys was concerned with hydrogen embrittlement(HE)mechanism.

关 键 词：Magnesium-lithium alloy Stress corrosion cracking I-phase Fracture analysis 

分 类 号：TG178[金属学及工艺—金属表面处理]