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Application of nucleation theory to the rate dependence of incipient plasticity during nanoindentation

Published online by Cambridge University Press:  03 March 2011

Christopher A. Schuh  and
Alan C. Lund
Christopher A. Schuh
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Alan C. Lund
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Abstract

We propose a nucleation theory-based analysis for incipient plasticity during nanoindentation and predict the statistical distribution of rate-dependent pop-in events for many nominally identical indentations on the same surface. In the framework of stress-assisted, thermally activated defect nucleation, we quantitatively rationalize new nanoindentation measurements on 4H SiC and extract the activation volume of the nucleation events that mark the onset of plastic flow. We also illustrate how this statistical approach can differentiate between unique nucleation events for different indenter tip geometries.

Keywords

DislocationsNucleationNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 7 , July 2004 , pp. 2152 - 2158
Copyright
Copyright © Materials Research Society 2004

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