• Novel anomalous strengthening is revealed in LZ96 and LA96 alloys during high-temperature rolling. • Monotonic strength increase in LZ96 arises from synergistic solid-solution strengthening and dynamic reprecipitation. • V-shaped strength evolution in LA96 stems from Al-rich particle dissolution and precipitation of fine nanoscale MgLi₂Al. • Alloying elements (Zn/Al) fundamentally alter the kinetics of dynamic recrystallization (DRX) and grain growth. The intrinsic low strength of ultra-light Mg-Li alloys restricts their wider application. This study investigates the microstructural evolution and mechanical properties of dual-phase Mg-9Li-6Zn (LZ96) and Mg-9Li-6Al (LA96) alloys hot-rolled at 150–350 °C. A binary Mg-10Li (L10) alloy serves as a benchmark. Unlike the conventional work-softening observed in L10, the alloyed variants exhibit “anomalous strengthening” at elevated temperatures. Specifically, the LZ96 alloy shows a monotonic increase in strength. In contrast, the LA96 alloy displays a “V-shaped” trend, reaching a minimum at 250 °C before achieving an exceptional yield strength of 262 MPa at 350 °C. Microstructural analysis reveals that this behavior is governed by phase-specific precipitate evolution. In LZ96, strengthening arises from solid-solution hardening in α-Mg and dense MgLi 2 Zn nano-needles in β-Li. In LA96, high-temperature rolling promotes the dissolution of Al, fueling the subsequent precipitation of dispersed MgLi₂Al nanoparticles. We propose a unified mechanism of strain-assisted dynamic precipitation and kinetic stabilization. Crystal defects generated during deformation act as potent nucleation sites. This process kinetically traps the microstructure in a high-strength, non-equilibrium state, establishing a new strategy for developing high-performance Mg-Li alloys.
Wáng et al. (Fri,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: