Dynamic recrystallization in adiabatic shear band in α-titanium

The microstructure and microtexture in adiabatic shear bands (ASBs) on the titanium side of the titanium/mild steel explosive cladding interface are investigated by means of OM, SEM/EBSD and TEM. The highly elongated subgrains and fine equiaxed grains with low dislocation density are observed in ASBs. Recrystallization microtextures (28°, 54°, 0°), (60°, 90°, 0°) and (28°, 34°, 30°) are formed within ASBs. According to the misorientation distribution, the grain boundaries in ASBs are geometrical necessary boundaries (GNBs) with high-angles. The temperature in the ASBs is estimated to be about 776∼1142 K (0.4∼0.6 Tm). Based on the rotational dynamic recrystallization (RDR) mechanism, the fine equiaxed grains in the core of ASBs are formed during the deformation processing. These results indicate that the dynamic recrystallization take place in ASBs.