Microstructure and Mechanical Properties of Selective Laser Melted Al–2.51Mn–2.71Mg–0.55Sc–0.29Cu–0.31Zn Alloy Designed by Supersaturated Solid Solution

作     者：Minbo Wang Ruidi Li Tiechui Yuan Haiou Yang Pengda Niu Chao Chen Minbo Wang;Ruidi Li;Tiechui Yuan;Haiou Yang;Pengda Niu;Chao Chen

作者机构：State Key Laboratory of Powder MetallurgyShenzhen Research Institute of CSUCentral South UniversityChangsha 410083China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi'an 710072China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2022年第35卷第3期

页      面：354-368页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：the National Natural Science Foundation of China(51871249) the Guangxi Key Research and Development Programme(Guike AB19050002) the Science and Technology Planning Project of Shenzhen(JCYJ20180508151903646) the Hunan Science Fund for Distinguished Young Scholars(2020JJ2046) Natural Science Foundation of Shandong Province(ZR2020ZD04) the Huxiang Youth Talent Support Programme(2018RS3007) 

主　　题：Selective laser melting Al–2.51Mn–2.71Mg–0.55Sc–0.29Cu–0.31Zn Supersaturated solid solution Microstructure Mechanical property Precipitation 

摘      要：Selective laser melting(SLM)of aluminium alloys for lightweight application is arousing widespread interest,but the available alloy compositions are limited due to unsatisfactory mechanical *** rapid solidifi cation of SLM provides a pathway to design a novel alloy composition with extended *** strategy is demonstrated by an additively manufactured novel Al–2.51 Mn–2.71 Mg–0.55 Sc–0.29 Cu–0.31 Zn alloy with the supersaturated solid solution in the present *** microstructure of as-build sample is characterized with multi-modal grains with the fi ne equiaxed grain(FEG,~800 nm)at molten pool boundaries,coarse equiaxed grain(CEG,~2μm)and columnar dendrites(CD,~4μm)inside the molten pool,which relates to the precipitations type and *** is observable that Al 3(Sc,Zr)precipitation particles with the size of~50 nm are dispersed in the FEG zone,while the interior of CEG shows no Al3(Sc,Zr)particle which only exists at the CEG *** of FEG,CEG or CD,the slender Al6 Mn precipitation with the length of~500 nm is distributed along the grain ***,a lot of vacancies and thickness fringes are detected in the FEG zone,which confi rms the supersaturated solid solution in laser rapid solidifi *** ultimate tensile strength and yield strength of the as-printed sample are~380 MPa and~330 MPa,respectively,with elongation~14%,which increase to~440 MPa and~410 MPa with a reduction of elongation to~9%after heat treatment.