Effect of Al2O3 nano-particles on the bond strength in CRB process

Layered alloy and composite materials have become an increasingly interesting topic in industrial development. Cold roll bonding (CRB) process, as a solid phase method of bonding, has been widely used in the manufacturing of large layered sheets and foils. In this paper, the CRB process characteristics of as-received commercial pure aluminum (AA 1100) strips, such as bond strength and threshold deformation in the presence of nano-sized Al2O3 particles are carried out and compared to that of layered pure aluminum. The bond strength was evaluated by the peeling test. The results show that the presence of Al2O3 particles reduces the bond strength of layered strips when compared to layered pure aluminum for the same deformation reduction applied through CRB process. However an increase in bond strength was achieved by pre- and post-rolling annealing the layered strips with and without Al2O3. But, it was found that the alumina particles have important effect on the pre- and post-rolling annealed strips. Finally, in order to evaluate the surface conditions of peeled surfaces optical and scanning electron microscopes were used.