Exploration of the transition from Harrison type-A kinetics to type-B kinetics regimes in grain boundary diffusion

Title: Exploration of the transition from Harrison type-A kinetics to type-B kinetics regimes in grain boundary diffusion
Creator: Belova, I. V.; Murch, G. E.
Relation: Defect and Diffusion Forum Vol. 273-276, p. 425-430
Publisher Link: http://dx.doi.org/10.4028/www.scientific.net/DDF.273-276.425
Publisher: Trans Tech Publications Ltd
Resource Type: journal article
Date: 2008
Description: We model the grain boundary tracer diffusion problem by constructing a 3D structure consisting of cubic grains each of equal volume. We build the structure in such a way that no four cubes have a common edge. It is shown that the transition point between Harrison Type-A and Type-B kinetics regimes occurs at a diffusant diffusion length roughly an order of magnitude smaller than for the extensively studied case of parallel grain boundary slabs. For two dimensional squares the transition point occurs at a diffusion length roughly a factor of five smaller than for parallel grain boundary slabs. Thus we can draw the conclusion that dimensionality and geometric shape are both important factors in the parametric analysis of the grain boundary diffusion problem.
Subject: effective diffusion; grain boundary diffusion; Harrison kinetics regimes
Identifier: http://hdl.handle.net/1959.13/39986
Identifier: uon:4534
Identifier: ISSN:1012-0386
Language: eng
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