Effect of Precipitates on Dynamic Recrystallization and Texture of Mg-Sn Alloy Under Different Strain Rates

The present study investigated the microstructure and texture evolution of Mg-Sn alloy with and without pre-existing precipitates under different strain rates. Rod-shaped Mg₂Sn phase was introduced in the Mg-Sn alloy by aging treatment. During deformation, the pre-existing Mg₂Sn provided more nucleation sites for dynamic precipitation, which gave rise to a finer and higher fraction of the Mg₂Sn phase. Additionally, strain rate significantly influenced the dynamic precipitation of Mg₂Sn, with increasing Mg₂Sn fraction as the strain rate decreased. Mg₂Sn could effectively inhibit the dynamic recrystallization (DRX) process, resulting in a decreased dynamic recrystallization region with increasing Mg₂Sn phase. The recrystallization texture intensity of the as-solutionized sample was weaker than that of the peak-aged sample, primarily because the low concentration of Sn atoms in the matrix was beneficial to the growth of DRX-ed grains with a similar orientation in the peak-aged sample and the fine and abundant precipitates hindered lattice deflection.