Abstract: The influence of an alternative magnetic field on the growth of the diffusion of Al and Mg in Al-Mg diffusion couple is studied. The diffusion zone is composed of two intermediate phases, namely β and γ phase. Thickness of each intermediate phase is examined. The results show that the alternative magnetic field increase the thicknesses of β and γ phase zone and the layer growth of β and γ phase obeys the parabolic rate law. The growth rate of the β and γ phase are increased with the application of the alternative magnetic field. This change is manifested through a change in the frequency factor k0 and not through a change in the activation energy Q. The frequency factor k0 for intermediate phase growth with an alternative magnetic field is 39.95 cm2/s for γ phase and 2.84×10-4 cm2/s for β phase compared with those without the magnetic field is 22.4 cm2/s for γ phase and 1.53×10-4 cm2/s for β phase.

Key words: Alternative magnetic field, Al-Mg Couple, Intermediate phase, Thickness, Diffusion