Low-temperature dynamic recrystallization occurring at a high deformation temperature during hot compression of twin-roll-cast Mg–5.51Zn–0.49Zr alloy

Low-temperature dynamic recrystallization, which generally occurs below 200 °C, was found to occur at an elevated deformation temperature as high as 350 and 400 °C as the strain rate employed was increased up to 100 s−1 during hot compression of twin-roll-cast Mg–5.51Zn–0.49Zr (wt.%) alloy. New recrystallized grains formed at the junction of misorientated dislocation pile-ups due to the rearrangement of the dislocation pile-ups. Both the climbing force acting on the leading dislocation ahead of the pile-up and the free-energy change during this rearrangement were calculated.