|Title||Contribution of triple junctions to the diffusion anomaly in nanocrystalline materials|
|Publication Type||Journal Article|
|Year of Publication||2007|
|Authors||Chen, Y, Schuh, CA|
|Pagination||253 - 256|
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.