Hot compressive deformation behavior of Mg–Zn–Y–Zr alloy under low strain rate

The deformation microstructure evolution and deformation mechanism of high-pressure solidified Mg–Zn–Y–Zr alloy was investigated by compression testing at 250 and 300 °C with a strain rate of 0.001 s⁻¹. The results showed that the peak stress of high pressure solidified Mg–Zn–Y–Zr alloy is higher than that of solidified at atmospheric pressure at 250 °C and 300 °C. A large number of slip, cross-slip and climb are activated and local stress is released due to the lower strain rate and the higher proportion of non-base slip, the twin coordination deformation effect is low. Compared with conventional casting alloy, high-pressure solidified alloys have higher recrystallization nucleation rate and growth rate, and their dynamic recrystallization occurs earlier and completes more efficiently. (paper)