Manning’s theory for diffusion in a random alloy was considered with regard to computer simulation, and application to real systems. The extension of Manning’s formalism to ordered alloys was described with respect to the L12 and B1 structures. In the case of Ni3Al, it was possible to impose conditions on the exchange frequencies; given information concerning tracer diffusion coefficients and any other structural or thermodynamic data. It was found that, in order for the minority component to have the lower diffusion coefficient, it was necessary that the exchange frequency for intra-Ni sub-lattice jumps of Ni atoms should be at least 3 times the exchange frequency for Al sub-lattice to Ni sub-lattice jumps by Al atoms.

G.E.Murch, I.V.Belova: Materials Science Forum, 1996, 223-224, 161-70