Deformation mode dependent mechanism and kinetics of dynamic recrystallization in hot working of titanium alloy

摘要

Dynamic recrystallization (DRX) plays great roles in the microstructure refinement and property improvement during hot working of titanium alloys. Various deformation modes in hot working may greatly affect the DRX mechanism and kinetics, but which has not attracted enough attention. In this work, the DRX mechanism and kinetics of titanium alloy in hot compression deformation (CD) and shear deformation (SD) were comparatively investigated by combining the electron backscatter diffraction technique and crystal plastic finite element models. The results show that discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) coexist in both of CD and SD, while their dominant mechanism and kinetics of DRX are quite different. These differences are found to be strongly dependent on the slip behavior and resulting misorientation development in each deformation mode. In CD, the smaller contribution ratios of basal