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A new insight on reversible deformation and incipient plasticity during nanoindentation test in MgO

Published online by Cambridge University Press:  31 January 2011

Alex Montagne ,
Christophe Tromas ,
Valérie Audurier  and
Jacques Woirgard
Alex Montagne*
Affiliation:
Laboratoire de Physique des Matériaux, SP2MI, 86962, Chasseneuil Futuroscope Cedex, France
Christophe Tromas
Affiliation:
Laboratoire de Physique des Matériaux, SP2MI, 86962, Chasseneuil Futuroscope Cedex, France
Valérie Audurier
Affiliation:
Laboratoire de Physique des Matériaux, SP2MI, 86962, Chasseneuil Futuroscope Cedex, France
Jacques Woirgard
Affiliation:
Laboratoire de Physique des Matériaux, SP2MI, 86962, Chasseneuil Futuroscope Cedex, France
*
a) Address all correspondence to this author. e-mail: christophe.tromas@univ-poitiers.fr
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Abstract

In this study, nucleation of dislocations in magnesium oxide (MgO) during nanoindentation with a spherical indenter is investigated. For flat and defect-free surfaces prepared by chemo/mechanical polishing, reversible load–displacement curves have been obtained for load as high as 300 mN, whereas on a cleaved MgO surface, pop-in and plastic deformation occur at 10 mN with the same indenter. Furthermore, these reversible curves deviate from the Hertz contact theory. Indented areas have then been characterized by atomic force microscopy and nanoetching. In some cases, few slip lines are observed for reversible indentation tests. However, the slip lines position indicate that the nucleation process of the corresponding dislocations is different from that involved during a pop-in phenomenon.

Keywords

CeramicDislocationsNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 883 - 889
Copyright
Copyright © Materials Research Society 2009

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