Statistical Derivation of Basic Equations of Diffusional Kinetics in Alloys with Application to the Description of Diffusion of Carbon in Austenite

Autor:	Vaks, V. G., Zhuravlev, I. A.
Rok vydání:	2012
Předmět:	Condensed Matter - Statistical Mechanics Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1134/S1063776112090166
Popis:	Basic equations of diffusional kinetics in alloys are statistically derived using the master equation approach. To describe diffusional transformations in substitution alloys, we derive the "quasi-equilibrium" kinetic equation which generalizes its earlier versions by taking into account possible "interaction renormalization" effects. For the interstitial alloys Me-X, we derive the explicit expression for the diffusivity D of an interstitial atom X which notably differs from those used in previous phenomenological treatments. This microscopic expression for D is applied to describe the diffusion of carbon in austenite basing on some simple models of carbon-carbon interaction. The results obtained enable us to make certain conclusions about the real form of these interactions, and about the scale of the "transition state entropy" for diffusion of carbon in austenite. Comment: 26 pages, 5 postscript figures, LaTeX
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1201.6056 Zobrazit plný text záznamu View this record from Arxiv