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Pop-in phenomenon during nanoindentation in MgO

Published online by Cambridge University Press:  15 September 1999

C. Tromas ,
J. Colin ,
C. Coupeau ,
J. C. Girard ,
J. Woirgard  and
J. Grilhé
C. Tromas*
Affiliation:
Laboratoire de Métallurgie Physique (UMR 6630 du CNRS), Université de Poitiers, UFR Sciences, bâtiment SP2MI-Bd 3, Téléport 2, B.P. 179, 86960 Futuroscope Cedex, France
J. Colin
Affiliation:
Laboratoire de Métallurgie Physique (UMR 6630 du CNRS), Université de Poitiers, UFR Sciences, bâtiment SP2MI-Bd 3, Téléport 2, B.P. 179, 86960 Futuroscope Cedex, France
C. Coupeau
Affiliation:
Laboratoire de Métallurgie Physique (UMR 6630 du CNRS), Université de Poitiers, UFR Sciences, bâtiment SP2MI-Bd 3, Téléport 2, B.P. 179, 86960 Futuroscope Cedex, France
J. C. Girard
Affiliation:
Laboratoire de Métallurgie Physique (UMR 6630 du CNRS), Université de Poitiers, UFR Sciences, bâtiment SP2MI-Bd 3, Téléport 2, B.P. 179, 86960 Futuroscope Cedex, France
J. Woirgard
Affiliation:
Laboratoire de Métallurgie Physique (UMR 6630 du CNRS), Université de Poitiers, UFR Sciences, bâtiment SP2MI-Bd 3, Téléport 2, B.P. 179, 86960 Futuroscope Cedex, France
J. Grilhé
Affiliation:
Laboratoire de Métallurgie Physique (UMR 6630 du CNRS), Université de Poitiers, UFR Sciences, bâtiment SP2MI-Bd 3, Téléport 2, B.P. 179, 86960 Futuroscope Cedex, France
*
Christophe.tromas@lmp.univ-poitiers.fr
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Abstract

During nanoindentation of MgO, a pop-in phenomenon has been observed, that is, an abrupt increase in penetration depth at a critical load. Atomic force microscopy investigations have been performed to characterise the dislocation structure in the vicinity of the indented area. The pop-in has been found to be the first stage of plastic deformation during nanoindentation. This phenomenon is ascribed to the nucleation and further propagation of interstitial loops of dislocations beneath the indenter. A three-dimensional model for a flat ended indenter is developed.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 8 , Issue 2 , September 1999 , pp. 123 - 128
Copyright
© EDP Sciences, 1999

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