Journal
SCRIPTA MATERIALIA
Volume 57, Issue 3, Pages 253-256Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2007.03.057
Keywords
grain boundary diffusion; nanocrystalline materials; triple junctions; grain boundaries
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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.
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