Samples of -phase material, containing 42 to 52at%Mg, were studied by using the Matano technique at temperatures ranging from 723 to 973K. It was found that the interdiffusivity coefficient decreased with increasing liquidus temperature, and went through a minimum at 47at%Mg. The diffusivity was about an order of magnitude greater than the self-diffusivity of Ag. The difference was attributed to the large thermodynamic factor for interdiffusion in the present phase. The activation energy for interdiffusion was almost equal to that for Ag self-diffusion, while the pre-exponential factor for interdiffusion was about an order of magnitude higher than that for the self-diffusion of Ag.

Y.Iijima, S.Suzuki, K.Kemmochi: Intermetallics, 1996, 4[2], 91-7