Microstructure and strengthening mechanism of hot-extruded ultralight Mg-Li-Al-Sn alloys with high strength

作     者：Gang Zhou Yan Yang Hanzhu Zhang Faping Hu Xueping Zhang Chen Wen Weidong Xie Bin Jiang Xiaodong Peng Fusheng Pan Gang Zhou;Yan Yang;Hanzhu Zhang;Faping Hu;Xueping Zhang;Chen Wen;Weidong Xie;Bin Jiang;Xiaodong Peng;Fusheng Pan

作者机构：International Joint Laboratory for Light Alloys(MOE)College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044China State Key Laboratory of Mechanical TransmissionsCollege of Materials Science and EngineeringChongqing UniversityChongqing 400044China Beijing SpacecraftsBeijing 100090China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第103卷第8期

页      面：186-196页

核心收录：

学科分类：0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the financial support from the Chongqing Research Program of Basic Research and Frontier Technology(Project No.cstc2019jcyj-msxm X0306) the National Key Research and Development Program of China(Project No.2016YFB0700403&Project No.2016YFB0301100) the fundamental Research funds for Central Universities(Project No.2021CDJJMRH001 and 2020CDJDPT001) the 111 Project(Project No.B16007)by the Ministry of Education and the State Administration of Foreign Experts Affairs of China 

主　　题：Ultralight Mg-Li alloy Microstructure Mechanical properties Precipitation Strengthening mechanism 

摘      要：Duplex-structured Mg-7Li-2Al-1.5Sn alloys with high strength were fabricated and their strengthening mechanism was *** Mg-7Li-2Al-1.5Sn alloys were prepared by casting and extruded at the temperature of 533 K with an extrusion ratio of 25:*** microstructure and mechanical properties of Mg-7Li-2Al-1.5Sn alloys were systematically investigated by OM,XRD,SEM,TEM,and tensile *** results show that Mg-7Li-2Al-1.5Sn alloys are mainly composed ofα-Mg,β-Li,LiMgAl_(2),Mg_(2)Sn and Li_(2)MgSn *** yield strength(YS),ultimate tensile strength(UTS)and elongation(EL)of the extruded alloy at room temperature reach 250 MPa,324 MPa and 11.9%,respectively.A lot of Sn-rich precipitates(Mg_(2)Sn and Li_(2)MgSn)are precipitated during extrusion with an average size of∼14 nm,which is beneficial to the grain *** recrystallization occurs during hot deformation and the nanoprecipitates effectively refine the dynamic recrystallized(DRXed)***,the residual dislocations existed in DRXed and un-DRXed grains result in the dislocation strengthening in the extruded ***7Li-2Al-1.5Sn alloys possess excellent high-temperature mechanical properties with the YS,UTS and EL of 200 MPa,237 MPa and 26.7%at 423 K,***-rich precipitates with good thermal stability can effectively prevent grain growth,which is good for the improvement of the high-temperature performance of Mg-Li-Al-Sn alloy.