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Surface effects on the properties of helical dislocations in nano films

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Document pages: 9 pages

Abstract: The governing equation of dislocations in nano films is established by image dislocation method. When the thickness of the nano film is infinite, the classical Peierls Nabarro equation can be restored. In order to determine the core width and Peierls stress of dislocations, the unstable stacking fault energy of Al and Cu nano films was calculated by first principle method. It is found that the surface effect can increase the Peierls stress of screw dislocation in Al and Cu nano films.

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