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Size-Dependent Diffusion Coefficient in Nanocrystalline Materials

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Abstract:

A simple model, without any free parameter, is introduced to predict the size-dependent diffusion coefficient of nanocrystalline materials in this contribution. It is found that as the size of the nanocrystals decreases, the diffusion activation energy of atoms decreases and the corresponding diffusion coefficient strongly increases due to the Arrhenius relationship between them, which leads to evident diffusion at the room temperature. The model prediction is in agreement with the experimental diffusion results of Cu and Ag diffusion in Cu nanocrystalline materials.

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Periodical:

Advanced Materials Research (Volumes 391-392)

Pages:

418-421

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.391-392.418

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Online since:

December 2011

Authors:

S. Zhang

Keywords:

Diffusion Coefficient, Size-Dependent

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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