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Determination of the true projected contact area by in situ indentation testing

Published online by Cambridge University Press:  30 August 2019

Gaylord Guillonneau ,
Jeffrey M. Wheeler ,
Juri Wehrs ,
Laetitia Philippe ,
Paul Baral Open the ORCID record for Paul Baral [Opens in a new window] ,
Heinz Werner Höppel ,
Mathias Göken  and
Johann Michler
Gaylord Guillonneau*
Affiliation:
Laboratory for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Testing and Research, Thun CH-3602, Switzerland; and Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, Université de Lyon, 69134 Ecully Cedex, France
Jeffrey M. Wheeler
Affiliation:
Laboratory for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Testing and Research, Thun CH-3602, Switzerland; and Laboratory for Nanometallurgy, Department of Materials Science, ETH Zürich, Zürich CH-8093, Switzerland
Juri Wehrs
Affiliation:
Laboratory for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Testing and Research, Thun CH-3602, Switzerland
Laetitia Philippe
Affiliation:
Laboratory for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Testing and Research, Thun CH-3602, Switzerland
Paul Baral
Affiliation:
Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, Université de Lyon, 69134 Ecully Cedex, France
Heinz Werner Höppel
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Materials Science and Engineering, Institute I: General Materials Properties WWI, 91058 Erlangen, Germany
Mathias Göken
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Materials Science and Engineering, Institute I: General Materials Properties WWI, 91058 Erlangen, Germany
Johann Michler
Affiliation:
Laboratory for Mechanics of Materials and Nanostructures, Empa, Swiss Federal Laboratories for Materials Testing and Research, Thun CH-3602, Switzerland
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A major limitation in nanoindentation analysis techniques is the inability to accurately quantify pile-up/sink-in around indentations. In this work, the contact area during indentation is determined simultaneously using both contact mechanical models and direct in situ observation in the scanning electron microscope. The pile-up around indentations in materials with low H/E ratios (nanocrystalline nickel and ultrafine-grained aluminum) and the sink-in around a material with a high H/E ratio (fused silica) were quantified and compared to existing indentation analyses. The in situ projected contact area measured by Scanning Electron Microscopy using a cube-corner tip differs significantly from the classical models for materials with low H/E modulus ratio. Using a Berkovich tip, the in situ contact area is in good agreement with the contact model suggested by Loubet et al. for materials with low H/E ratio and in good agreement with the Oliver and Pharr model for materials with high H/E ratio.

Keywords

nanoindentationprojected contact areahardnessscanning electron microscopy (SEM)
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 16 , 28 August 2019 , pp. 2859 - 2868
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

*This article has been corrected since its original publication. An erratum notice detailing these changes was also published (doi: 10.1557/jmr.2019.310).

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