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Plasticity size effects in nanoindentation

Published online by Cambridge University Press:  03 March 2011

A.J. Bushby  and
D.J. Dunstan
A.J. Bushby
Affiliation:
Department of Materials, Centre for Materials Research, Queen Mary, University of London, London E1 4NS, United Kingdom
D.J. Dunstan
Affiliation:
Department of Physics, Centre for Materials Research, Queen Mary, University of London, London E1 4NS, United Kingdom
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Abstract

In conventional continuum mechanics, the yield behavior of a material is size independent. However, in nanoindentation, plasticity size effects have been observed for many years, where a higher hardness is measured for smaller indentation size. In this paper we show that there was a size effect in the initiation of plasticity, by using spherical indenters with different radii, and that the length scale at which the size effect became significant depended on the mechanism of plastic deformation. For yield by densification (fused silica), there was no size effect in the nanoindentation regime. For phase transition (silicon), the length scale was of the order tens of nanometers. For materials that deform by dislocations (InGaAs/InP), the length scale was of the order a micrometer, to provide the space required for a dislocation to operate. We show that these size effects are the result of yield initiating over a finite volume and predict the length scale over which each mechanism should become significant.

Keywords

NanoindentationStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 137 - 142
Copyright
Copyright © Materials Research Society 2004

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