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Dislocation Configurations Around Nanoindentations in Reconstructed Au(001)

Published online by Cambridge University Press:  17 March 2011

O. Rodríguez de la Fuente ,
M.A. González  and
J.M. Rojo
O. Rodríguez de la Fuente
Affiliation:
Departamento de Física de Materiales, Universidad Complutense, 28040 Madrid, Spain
M.A. González
Affiliation:
Departamento de Física de Materiales, Universidad Complutense, 28040 Madrid, Spain
J.M. Rojo
Affiliation:
Departamento de Física de Materiales, Universidad Complutense, 28040 Madrid, Spain
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Abstract

Nanoindentations resulting from STM tungsten tip contacts with the 5×20 reconstructed surface of a Au(001) crystal around the indentation point have been studied by Scanning Tunnel Microscopy (STM). A novel defect structure is recognised: a row of hillocks extending along more than a hundred nm along the <110> directions stemming from the indentation point. These hillocks have about 7 nm of side and 0.06 nm of height. With the help of simulation models we identify individual hillocks as dislocation configurations consisting of two stacking fault ribbons encompassed by Shockley partials having a stair-rod dislocation as a ridge. It is proposed that hillocks are generated by plastic flow, from an initially nucleated V-shaped dislocation loop intersecting the surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q5.2
Copyright
Copyright © Materials Research Society 2001

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References

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