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Nanoindentation Behavior of Gold Single Crystals

Published online by Cambridge University Press:  01 February 2011

Martha M. McCann  and
Sean G. Corcoran
Martha M. McCann
Affiliation:
Virginia Tech, Department of Materials Science and Engineering, Blacksburg, VA 24061
Sean G. Corcoran
Affiliation:
Virginia Tech, Department of Materials Science and Engineering, Blacksburg, VA 24061
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Abstract

Nanoindentation is an increasingly used tool to investigate the mechanical properties of very small volumes of material. It is usually a very consistent measure of the elastic response of material and plastic response to point contact loading. Nanoindentation experiments on gold single crystals display tremendous variation in the residual deformation. The depth of penetration, which is vital in hardness determination, can differ by as much as 100%. This large variability of the load-depth data is usually explained by surface differences such as crystal orientation, oxide thic kness, presence of multiple solid phases, or contamination layers. None of these reasons apply to the variation observed in the gold system. The onset of plastic deformation is observed at a stress level on the order of the theoretical yield strength. The difference in depth of penetration is independent of this elastic -plastic transition. This paper reports on attempts to correlate the depth of penetration to surface feature size and surface preparation procedures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 795: Symposium U – Thin Films - Stresses and Mechanical Properties X , 2003 , U8.30
Copyright
Copyright © Materials Research Society 2004

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References

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