Adiabatic shear band on the titanium side in the Ti/mild steel explosive cladding interface

The microstructures of the adiabatic shear band (ASB) on the pure titanium side in the titanium/mild steel explosive cladding interface were investigated by means of OM, SEM and TEM. Very small equiaxed grains (<0.1 mu m) with a low dislocation density were observed in ASB. These results were discussed in terms of dynamic recrystallization, that is enabled by the adiabatic temperature rise associated with plastic deformation. This dramatic microstructural refinement enables a thermo-mechanical response that may lead to a superplastic deformation in ASB. The reasons that ASB, occurred only on the titanium side and not on the mild steel side were discussed, and which was related to the differences in physical, mechanical, thermal properties and crystal structure between titanium and mild steel.