Contribution of triple junctions to the diffusion anomaly in nanocrystalline materials

TitleContribution of triple junctions to the diffusion anomaly in nanocrystalline materials
Publication TypeJournal Article
Year of Publication2007
AuthorsChen, Y, Schuh, CA
JournalScripta Materialia
Volume57
Issue3
Pagination253 - 256
Date Published2007/08//
Abstract

Diffusion in nanocrystalline materials is often greatly enhanced even beyond what is expected from a high density of equilibrated grain boundaries. We propose that this 'anomalous diffusion' may in many cases be due to short-circuit diffusion along triple junctions. Quantitative analysis shows that triple junction diffusion can reasonably explain anomalies of several orders of magnitude. Therefore, previous suggestions of non-equilibrium grain boundary structures in nanocrystalline materials may not be required to rationalize the anomaly in every case. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.