Atomic-Ordering Kinetics and Diffusivities in Ni–Fe Permalloy

Taras M. Radchenko; Valentin A. Tatarenko

doi:10.4028/www.scientific.net/DDF.273-276.525

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Atomic-Ordering Kinetics and Diffusivities in Ni–Fe Permalloy

Abstract:

Using the static concentration waves’ method and self-consistent-field approximation, the Onsager-type kinetics equation is solved to describe the L12-type long-range order (LRO) relaxation. To calculate the diffusivities for Permalloy, the experimental diffraction data in respect to LRO-parameter evolution for Ni3Fe are used. Theoretical curves of a time-dependent LRO for Ni– Fe are plotted. Dilution of alloying element (with a deviation from stoichiometry) results in deceleration of the LRO-parameter history (at the initial evolution stage) and in an increase of its relaxation time. Both statistical-thermodynamics and kinetics results show: at high temperatures, equilibrium LRO parameter for non-stoichiometric Permalloys can be higher than for stoichiometric one.