Microstructure and Mechanical Properties of Superlight Mg-10Li-3Al-3Zn Cabins Fabricated by Multi-directional Forging, Die Forging, and Annealing.

Superlight Mg-10Li-3Al-3Zn (LA103Z) alloy cabins were fabricated by the integration of multi-directionally forging (MDF), die forging, and annealing treatment. α-Mg, β-Li, AlLi, MgLi₂Al, and Mg₁₇Al₁₂ phases are detected in the as-cast alloy. Dynamic precipitation dominates during MDF and the relatively randomized macro-texture endows the MDFed billet with quasi-isotropic tensile properties. During subsequent compression, the grain growth and phase dissolution tend to occur with the decline of Zener–Hollomon parameter. The cabin die-forged at 260 °C and 6 mm/s owns the superior strength compared with the other cabins, which should be attributed to the sufficient dissolution of AlLi phases, fine grain size, reasonable amount and distribution of MgLi₂Al particles, etc. Further annealed at 245 °C for 3 h, the above cabin exhibits the optimal comprehensive mechanical properties with the tensile yield strength (TYS) of 211 MPa, ultimate tensile strength (UTS) of 243 MPa, and elongation of 20.0%. This work provides a feasible way for industrial production of high-performance large-scale Mg-Li components. [ABSTRACT FROM AUTHOR]