Laser additive manufacturing of strong and ductile Al-12Si alloy under static magnetic field  

作　　者：R.Wang J.Wang L.M.Lei S.Yu T.Hu S.S.Shuai S.Z.Xu Z.H.Cao X.P.Li C.Y.Chen Z.M.Ren 

机构地区：[1]State Key Laboratory of Advanced Special Steels,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [2]AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 201108,China [3]School of Mechanical and Manufacturing Engineering,The University of New South Wales(UNSW Sydney),Sydney NSW 2052,Australia

出　　处：《Journal of Materials Science & Technology》2023年第32期101-112,共12页材料科学技术（英文版）

基　　金：the National Key Research and Development Program of China(No.2019YFA0705300,2021YFB3702502);the National Natural Science Foundation of China(Nos.52001191,52127807,52271035);Natural Science Foundation of Shanghai(No.23ZR1421500);SPMI Project from Shanghai Academy of Spaceflight Technology(No.SPMI2022-06);Independent Research Project of State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy;Shanghai University(No.SKLASS 2022-Z10);the Science and Technology Commission of Shanghai Municipality(No.19DZ2270200).

摘　　要：Rapid cooling and solidification during laser additive manufacturing(LAM)can produce ultra-fine microstructure with higher strength.However,the non-uniform cell/grain structure can easily result in early stress concentration and fracture during deformation,which remains a major challenge for the LAM field.Using Al-12Si as the model alloy,we employed the external static magnetic field(SMF)to modulate the laser powder bed fusion process(L-PBF),demonstrating a uniform microstructure with a refined cell structure.The mechanical properties show that the SMF can produce a combination of high tensile strength of 451.4±0.5 MPa and large uniform elongation of 10.4%±0.79%,which are superior to those of previously-reported Al-Si alloys with post-treatment or element alloying.The mechanism analysis based on multi-scale simulation reveals the determining role of SMF in rapid solidification,and this method is applicable to the microstructure control of other metallic materials during LAM.

关 键 词：Laser powder bed fusion Magnetic field Al alloys Grain refinement Strengthening mechanism 

分 类 号：TB331[一般工业技术—材料科学与工程]