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Energetics of Dislocation Nucleation under a Nanoindenter

Published online by Cambridge University Press:  10 February 2011

Chuanli Zhang  and
Guanshui Xu
Chuanli Zhang
Affiliation:
Department of Mechanical EngineeringUniversity of California, Riverside, CA92521
Guanshui Xu
Affiliation:
Department of Mechanical EngineeringUniversity of California, Riverside, CA92521
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Abstract

Dislocation nucleation under an idealized nanoindenter is analyzed based on the Peierls-Nabarro dislocation model. The variational boundary integral method is used to obtain the dislocation profiles that correspond to the shear displacements between the adjacent atomic layers along the slip plane. The critical condition for dislocation nucleation at absolute zero and the activation energies required to thermally activate dislocations from their stable to unstable saddle point configurations are determined. By treating the surface as part of an infinite crack embedded in the infinite medium, a rather straightforward approach is adopted to account for the surface effect. The emission of multiple dislocations from the surface of a film-substrate system is also studied. The size effects of the indenter width and film thickness are characterized by the typical load-displacement relation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 778: Symposium U – Mechanical Properties Derived from Nanostructuring Materials , 2003 , U6.1
Copyright
Copyright © Materials Research Society 2002

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