Li添加对激光粉末床熔融成形Al-Cu-Mg-Sc-Zr合金组织与性能的影响  

Effect of Li Addition on Microstructure and Properties of Al-Cu-Mg-Sc-Zr Alloy Prepared by Laser Powder Bed Fusion

作　　者：高建宝 刘燕[1] 吴祖胜 章媛洁 张金良[1] 宋波[1] 史玉升[1] GAO Jianbao;LIU Yan;WU Zusheng;ZHANG Yuanjie;ZHANG Jinliang;SONG Bo;SHI Yusheng(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;School of Mechanical&Electrical Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]华中科技大学材料成形与模具技术全国重点实验室,武汉430074 [2]武汉工程大学机电工程学院,武汉430205

出　　处：《有色金属工程》2024年第12期19-30,I0002,共13页Nonferrous Metals Engineering

基　　金：国家重点研发计划项目(2023YFB4604800);国家自然科学基金资助项目(52275331,52201041,52401047);湖北省重点研发计划(2022BAA011);中国博士后科学基金(2021M690061,2023M741244)。

摘　　要：采用激光粉末床熔融技术制备了Al-Cu-Mg-Sc-Zr和Al-Cu-Mg-Li-Sc-Zr合金,对比研究了Li的添加对Al-Cu-Mg-Sc-Zr合金微观组织和力学性能的影响。结果表明,Al-Cu-Mg-Li-Sc-Zr合金中存在四方形的Al_(3)(Sc,Zr)相、球形Al_(3)Li相和针状Al_(2)CuMg相。Li的添加促进Al_(3)Li相的形成,具有第二相强化效果,提高合金力学性能。Al-Cu-Mg-Li-Sc-Zr合金的抗拉强度和伸长率分别为(548±4)MPa和9.2%±0.3%,与Al-Cu-Mg-Sc-Zr合金相比,添加Li的合金的抗拉强度和伸长率分别提高了16.3%和15.0%,表现出优异的强度和塑性。In this study,Al-Cu-Mg-Sc-Zr and Al-Cu-Mg-Li-Sc-Zr alloys were prepared by laser powder bed fusion,and the effect of Li addition on the microstructure and mechanical properties of Al-Cu-Mg-Sc-Zr alloys was studied.The results show the presence of tetragonal Al_(3)(Sc,Zr)phase,black spherical Al_(3)Li phase,and acicular Al_(2)CuMg phase in Al-Cu-Mg-Li-Sc-Zr alloy.The addition of Li promotes the formation of Al_(3)Li phase,enhancing the alloy′s mechanical properties through second-phase strengthening.The ultimate tensile strength and elongation of Al-Cu-Mg-Li-Sc-Zr alloy are(548±4)MPa and 9.2%±0.3%,respectively.Compared with Al-Cu-Mg-Sc-Zr alloy,the ultimate tensile strength and elongation of Li-added alloy increased by 16.3%and 15.0%,respectively,showing excellent strength and ductility.

关 键 词：激光粉末床熔融 铝锂合金 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]