Diffusion and formation of intermetallic compounds during accumulative roll-bonding of Al/Mg alloys

Abstract

In this study, the accumulative roll-bonding (ARB) process is used to reduplicate Al (1100)/Mg (AZ31) alloy and then made thinner and longer by multi-rolling. Stacks with 24 layers were created and annealed at 300°C for 1 h. The microstructures were observed by using optical microscopy. The diffusion couples between Al and Mg were investigated to study the composition of the Al-Mg system. The layers of the intermetallic compounds Al 3Mg2 and Al12Mg17 were observed by a field emission scanning electron microscope. The composition-depth curves of the diffusion zone were obtained by employing electron microprobe analysis after annealing at 300°C for 1 h. © 2007 The Japan Institute of Metals.