A recent treatment of diffusion in a lattice-fixed frame of reference, which could predict the Kirkendall shift, was modified to be applicable also to the migration of phase interfaces. The net flux across a reference point in the lattice, yielding the Kirkendall shift, as well as the net flux across a phase interface, yielding its migration, were obtained from the same flux equation. Numerical calculations were presented and demonstrated that the method gave expected results. The strength of the method was that it was not based upon the assumption of local equilibrium and it was capable of automatically yielding close to local equilibrium conditions except at high supersaturations. There it described an increasing deviation from local equilibrium as the initial alloy composition was moved inside the 1-phase field for the new phase. The interaction of a migrating phase interface and Kirkendall markers was also illustrated.

Unified Treatment of Kirkendall Shift and Migration of Phase Interfaces. H.Larsson, H.Strandlund, M.Hillert: Acta Materialia, 2006, 54[4], 945-51