Abstract:The explosive-cladding TA2/A3 interface bonding zone has been investigated by means of TEM technique. The results showed that the "metallurgical bond" of the explosive cladding was achieved by localized melting and diffusion at the contacted surface. There were microcrystals and amorphous in the molten region due to the rapid cooling，there were diffusion across the interface layer. The residual structure around the explosive cladding TA2/A3 interface bonding zone consists of the interface layer (varied in 0. 1 um width)，the thermal influence zone and the deformation zone (within the distance of一50um from the interface layer) on the A3 side，and the a- diabatic structure and ASB，on the TA2 side. Farther away from the interface layer in mild steel (A3)and pure titanium (TA2)，the deformation mechanism was reflected in the twins. The twin density in A3 is much lower than that in TA2.

Key words: explosive-cladding interface layer  amorphous   adiabatic shearing  diffusion   twinning