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Advances in Materials Science and Engineering
Volume 2017, Article ID 6413495, 9 pages
https://doi.org/10.1155/2017/6413495
Research Article

Surface Effects on the Properties of Screw Dislocation in Nanofilms

1Department of Physics, Chongqing Three Gorges University, Chongqing 404100, China
2Institute for Structure and Function, Chongqing University, Chongqing 401331, China
3College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Correspondence should be addressed to Xiaozhi Wu; nc.ude.uqc@uwihzoaix

Received 13 November 2016; Accepted 16 January 2017; Published 5 February 2017

Academic Editor: Santiago Garcia-Granda

Copyright © 2017 Lili Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The image dislocation method is used to construct the governing equation of dislocations in nanofilms. The classical Peierls-Nabarro equation can be recovered when the thickness of nanofilm is taken to be infinite. In order to determine the core width and Peierls stress of dislocations, the unstable stacking fault energies of Al and Cu nanofilms are calculated via the first-principle methods. It is found that surface effect can increase the Peierls stresses of screw dislocations in Al and Cu nanofilms.