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Dislocation-mediated Mechanisms of Mass Transport around Nanoindentations in Fcc Metals

Published online by Cambridge University Press:  11 February 2011

Oscar Rodríguez de la Fuente ,
Esther Carrasco ,
Miguel A. González  and
Juan M. Rojo
Oscar Rodríguez de la Fuente
Affiliation:
Departamento de Física de Materiales, Universidad Complutense, 28040 Madrid, SPAIN
Esther Carrasco
Affiliation:
Departamento de Física de Materiales, Universidad Complutense, 28040 Madrid, SPAIN
Miguel A. González
Affiliation:
Departamento de Física de Materiales, Universidad Complutense, 28040 Madrid, SPAIN
Juan M. Rojo
Affiliation:
Departamento de Física de Materiales, Universidad Complutense, 28040 Madrid, SPAIN
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Abstract

We present evidence for the operation on reconstructed Au(001) of a novel mechanism, involving dislocation motion, which is much more efficient than surface diffusion to redistribute mass around nanoindentations. Cross-slip of individual dislocations generated around the indentation point, with a screw component perpendicular to the surface, is shown to be responsible for the generation of multiple-storied, crystallographically-oriented terraces around the nanoindentation points. We also show that standard dislocation theory can be used to quantitatively describe the characteristics of the dislocations involved in the different processes around the nanoindentation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 738: Symposium G – Spatially Resolved Characterization of Local Phenomena in Materials and Nanostructures , 2002 , G7.25
Copyright
Copyright © Materials Research Society 2003

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References

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