Effect of Li Addition on Microstructure and Properties of Al-Cu-Mg-Sc-Zr Alloy Prepared by Laser Powder Bed Fusion
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 Al3(Sc,Zr)phase,black spherical Al3 Li phase,and acicular Al2CuMg phase in Al-Cu-Mg-Li-Sc-Zr alloy.The addition of Li promotes the formation of Al3 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.
laser powder bed fusionAl-Li alloymicrostructuremechanical property
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