LAUSR

The microstructure and mechanical properties of Mg−3Li−8Gd−2Y−1.5Ag (wt%) alloy at as‐cast state, as‐solution state, and as‐rolled state (three rolling reductions of 30, 50, and 70%) are investigated. With the increase in solution time at 520 °C, the dissolution of Mg24(Gd,Y)5 phase along the grain boundaries and the coarsening of grain size occur. The solution parameters of 520 °C/4 h are chosen in combination with microstructural evolution, grain size, and microhardness. The dynamic precipitation of irregular spherical‐like β1, needle‐like β′, fine β, and twins is observed after 30% hot rolling at 450 °C. With increasing the reduction to 70%, the number of β1, β′, and twins increases and massive stacking faults (SFs) appear in the twins. The strength and ductility of Mg−3Li−8Gd−2Y−1.5Ag alloy are simultaneously improved by the combination of solution treatment and hot‐rolling process due to the precipitation strengthening of β1 and β′, the formation of twins and SFs, and the fragmentation of Mg24(Gd,Y)5 phase along the grain boundaries.