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The microscopic model of atomic diffusion is considered to describe theshort-range order relaxation kinetics within the f.c.c.-Ni-Fe Permalloys. Themodel takes into account both the discrete and anisotropic characters of atomicjumps within the long-range field of concentration heterogeneities of theinteracting atoms. The diffusion coefficients and activation energies for thedisordered Ni-Fe permalloy are estimated with the evaluated probabilities ofatomic jumps. As shown, the increasing of a temperature with a fixedcomposition influences on the 'potential' field of interatomic interactionambiguously: the field 'potential' increases for defined coordination shellsand decreases for some of other ones. Although the temperature increasingpromotes the increasing of any atomic-probabilities jumps generally, butdecreasing of the action of 'potential' field generated by the atoms of definedelement and caused by its concentration heterogeneities onto the distant sitesresults in increasing of the atomic-jumps' probabilities of just this element,first of all, into the sites, which are more distant from the 'source' ofheterogeneity. Within the framework of the static concentration waves' methodalong with the self-consistent field approximation, the Onsager-type kineticsequation is obtained to describe the long-range order relaxation by theL12-type superstructure. To calculate diffusivities for the ordered Ni3Fepermalloy, the independent, diffraction experimental data of the long-rangeorder parameter relaxation are used. Theoretical curves of the long-range ordertime evolution for the non-stoichiometric f.c.c.-Ni-Fe permalloys are plotted.Decreasing of the concentration of alloying element results in decelerating ofthe long-range order parameter change and in increasing of its relaxation time.

Diffusivities and kinetics of short-range and long-range orderings in Ni-Fe permalloys