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The Grain Boundary Diffusion Kinetics in Nanocrystalline Zirconia

Published online by Cambridge University Press:  10 February 2011

A. P. Zhilyaev ,
V. Y. Gertsman  and
J. A. Szpunar
A. P. Zhilyaev
Affiliation:
Dept. of Metallurgical Engineering, McGill University, 3450 University Street, Montreal, Quebec, Canada H3A 2A7, [email protected] On leave from Institute for Metal Superplasticity, Russian Academy of Sciences, 450001 Ufa, Russia
V. Y. Gertsman
Affiliation:
Dept. of Metallurgical Engineering, McGill University, 3450 University Street, Montreal, Quebec, Canada H3A 2A7, [email protected] On leave from Institute for Metal Superplasticity, Russian Academy of Sciences, 450001 Ufa, Russia
J. A. Szpunar
Affiliation:
Dept. of Metallurgical Engineering, McGill University, 3450 University Street, Montreal, Quebec, Canada H3A 2A7, [email protected]
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Abstract

It is expected that the grain boundary diffusion is the principal contributor to the transport properties of nanocrystalline zirconia, and that it controls the oxidation kinetics and hydrogen permeation. This process depends on the grain boundary character distribution (i.e. the fractions of different grain boundary types) and on the topological characteristics of the grain boundary network. Modeling of the random walk problem on a planar honeycomb network for different types of the grain boundary misorientation distributions (GBMD) in nanocrystalline zirconia film is presented in the current paper. The GBMD was calculated using the model texture. Changes of the oxidation rate for different types of the grain boundary character distribution and different ratios of the bulk and grain boundary diffusion coefficients are analyzed. In this study it was found that an increase of the frequency of low energy boundaries lowers the oxidation rate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 61
Copyright
Copyright © Materials Research Society 1997

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References

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