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Nanoindentation Study of Very Low Stress Plasticity

Published online by Cambridge University Press:  10 February 2011

J. Woirgard ,
C. Tromas ,
V. Audurier  and
J.C. Girard
J. Woirgard
Affiliation:
Laboratoire de Métallurgie Physique, U.M.R. C.N.R.S. 6630, Université de Poitiers Bat SP2MI, BP 179, 86960 Futuroscope Cedex, France.
C. Tromas
Affiliation:
Laboratoire de Métallurgie Physique, U.M.R. C.N.R.S. 6630, Université de Poitiers Bat SP2MI, BP 179, 86960 Futuroscope Cedex, France.
V. Audurier
Affiliation:
Laboratoire de Métallurgie Physique, U.M.R. C.N.R.S. 6630, Université de Poitiers Bat SP2MI, BP 179, 86960 Futuroscope Cedex, France.
J.C. Girard
Affiliation:
Laboratoire de Métallurgie Physique, U.M.R. C.N.R.S. 6630, Université de Poitiers Bat SP2MI, BP 179, 86960 Futuroscope Cedex, France.
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Abstract

The early stages of plasticity have been studied by nanoindentation at room temperature, with a new apparatus, in GaAs and MgO single crystals. On both materials a very well defined pop-in has been observed, whose characteristics depends on the initial dislocation density in the indented zone. On (100) cleaved surfaces of MgO crystals, several special surface features, including the presence of rosette arms, have been observed by SFM. Starting from these observations a dislocation mechanism has been proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 65
Copyright
Copyright © Materials Research Society 1998

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