| Abstract Scope |
Al–Li alloys exhibit higher specific strength, superior stiffness, and lower density compared to conventional aluminum alloys, making them attractive for lightweight structural applications in aerospace, automotive, and defense industries. Lithium reduces density and increases elastic modulus, copper enhances age hardening, and zirconium forms fine dispersoids that refine grains and suppress recrystallization. However, Al–Li–Cu–Zr alloys often suffer from limited ductility and poor crack resistance due to inhomogeneous precipitation and pronounced planar slip. To address these issues, the effect of magnesium addition was investigated. Small Mg additions promote nucleation of strengthening precipitates, whereas excessive Mg suppresses their formation. These interactions indicate that precise control of Mg content is essential to optimize the balance between strength and ductility. In this study, Mg content, alloying elements, and microstructural control were optimized, and heat treatment was applied to improve the mechanical strength of Al–Li alloys. |