Dynamic Recrystallization Mechanism and Precipitation Behavior of Mg-6Gd-3Y-3Sm-0.5Zr Alloy During Hot Compression

The effects of temperature and strain on dynamic recrystallization (DRX) and dynamic precipitation of Mg-6Gd-3Y-3Sm-0.5Zr alloy were studied through uniaxial compression. The main conclusions were as follows: the increase of strain or temperature can promote DRX. The texture strength decreases with the increase of DRX fraction. The pyramidal slip and pyramidal slip were activated to coordinate strain when deformed at high-temperature. Under the deformation condition of T = 400 °C, ε ˙ = 0.002 s −1 and ε = 0.35, the mechanism of DRX was mainly discontinuous dynamic recrystallization. The rotation continuous dynamic recrystallization gradually becomes the main mechanism with the increase of strain and temperature. At the same time, the particle stimulated nucleation (PSN) caused by a single large-sized Mg 5 (Gd, Y, Sm) or the aggregation of multiple Mg 5 (Gd, Y, Sm) phases was also found. The dynamic precipitation can stimulate the nucleation of DRX, and the boundary of DRXed grains can become an effective nucleation site for dynamic precipitation. DRX and dynamic precipitation can promote nucleation mutually. Graphical Abstract