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Combination of Continuum and Atomistic Approaches for the Study of Dislocation Nucleation from Atomic Size Surface Defects

Published online by Cambridge University Press:  21 March 2011

Sandrine Brochard ,
Pierre Beauchamp  and
Jean Grilhé
Sandrine Brochard
Affiliation:
Laboratoire de Métallurgie Physique, UMR 6630 du CNRS, Université de Poitiers, UFR Sciences SP2MI, Téléport 2, Bd. Marie et Pierre Curie, B.P. 30179 86962 Futuroscope Chasseneuil Cedex, FRANCE
Pierre Beauchamp
Affiliation:
Laboratoire de Métallurgie Physique, UMR 6630 du CNRS, Université de Poitiers, UFR Sciences SP2MI, Téléport 2, Bd. Marie et Pierre Curie, B.P. 30179 86962 Futuroscope Chasseneuil Cedex, FRANCE
Jean Grilhé
Affiliation:
Laboratoire de Métallurgie Physique, UMR 6630 du CNRS, Université de Poitiers, UFR Sciences SP2MI, Téléport 2, Bd. Marie et Pierre Curie, B.P. 30179 86962 Futuroscope Chasseneuil Cedex, FRANCE
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Abstract

Atomistic simulations realized on an f.c.c. crystal containing atomic size surface defects (step and groove) show that the defects are privileged sites for dislocation nucleation. Before nucleation, an elastic shear, precursor of the dislocation, appears in the plane in zone with the step where the dislocation will be nucleated. In order to explain the strong localization of the localized elastic precursor shear, we have analyzed the stress concentration near the surface defects using the continuum point force approach. For the step case, the origin of the localized shear is related to an increase in the interplanar separation due to the stress concentration.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 677: Symposium AA – Advances in Materials Theory and Modeling–Bridging Over Multiple-Length and Time Scales , 2001 , AA5.5
Copyright
Copyright © Materials Research Society 2001

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References

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