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

TitleApplication of nucleation theory to the rate dependence of incipient plasticity during nanoindentation
Publication TypeJournal Article
Year of Publication2004
AuthorsSchuh, CA, Lund, AC
JournalJournal of Materials Research
Volume19
Issue7
Pagination2152 - 2158
Date Published2004/07//
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.