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The role of crystalline anisotropy in mechanical property extractions through Berkovich indentation

Published online by Cambridge University Press:  31 January 2011

J. Alcalá ,
D. Esqué-de los Ojos  and
S.A. Rodríguez
J. Alcalá*
Affiliation:
GRICCA-EUETIB, Universitat Politècnica de Catalunya, Barcelona 08036, Spain
D. Esqué-de los Ojos
Affiliation:
GRICCA-EUETIB, Universitat Politècnica de Catalunya, Barcelona 08036, Spain
S.A. Rodríguez
Affiliation:
Surface Phenomena Laboratory, Department of Mechanical Engineering. University of São Paulo, 05508-90 Sao Paulo, Brazil
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

This work uses crystal plasticity finite element simulations to elucidate the role of elastoplastic anisotropy in instrumented indentation P–hs curve measurements in face-centered cubic (fcc) crystals. It is shown that although the experimental fluctuations in the loading stage of the P–hs curves can be attributed to anisotropy, the variability in the unloading stage of the experiments is much greater than that resulting from anisotropy alone. Moreover, it is found that the conventional procedure used to evaluate the contact variables ruling the unloading P–hs curve introduces an uncertainty that approximates to the more fundamental influence of anisotropy. In view of these results, a robust procedure is proposed that uses contact area measurements in addition to the P–hs curves to extract homogenized J2-plasticity-equivalent mechanical properties from single crystals.

Keywords

NanoindentationNanoscalePolycrystal
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 1235 - 1244
Copyright
Copyright © Materials Research Society 2009

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References

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