Influence of processing parameters on the bond toughness of roll-bonded aluminium strip

The bond toughness of two adjacent aluminum sheets produced by roll bonding was investigated by measuring the critical strain energy release rate required to initiate a crack between them. It was found that higher rolling temperatures, higher rolling reduction and post-rolling recrystallization annealing improved the bond toughness. Higher rolling reduction also generated both simple and branched shear bands that helped to puncture the interfacial oxide layer and enhance bond toughness.