Size effects on yield instabilities in nickel

Megan J. Cordill, Neville R. Moody, William W. Gerberich

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


Dislocation events are seen as excursions, or pop-in events, in the load-displacement trace of nanoindentation experiments. When indenting single crystal metals these events occur frequently during quasi-static and dynamic loading. A single crystal of Ni (111) has been indented quasi-statically using three different loading rates (10, 100, and 1000 μN/s) as well as with three different radii diamond indenter tips (1000 nm cone, 300 nm Berkovich, and 50 nm cube corner) to examine the occurrences of excursions. As expected, excursions at higher loads have larger displacements, and that initial loading follows Hertzian behavior up to the point of yield. Also, as the tip size is reduced the excursion loads are reduced. The excursion events depend mostly on the statistical distribution of surface sources and substructure dislocation arrangements.

Original languageEnglish (US)
Title of host publicationSize Effects in the Deformation of Materials
Subtitle of host publicationExperiments and Modeling
Number of pages6
StatePublished - Dec 1 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 27 2006Dec 1 2006

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2006 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA


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