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Size Effects on Yield Instabilities in Nickel

Published online by Cambridge University Press:  26 February 2011

Megan J Cordill ,
Neville R Moody  and
William W Gerberich
Megan J Cordill
Affiliation:
cordill@cems.umn.edu, University of Minnesota, Chemical Engineering and Materials Science, 421 Washington Ave SE, Minneapolis, MN, 55455, United States
Neville R Moody
Affiliation:
nrmoody@sandia.gov, Sandia National Laboratories, Livermore, CA, 94550, United States
William W Gerberich
Affiliation:
wgerb@umn.edu, University of Minnesota, Chemical Engineering and Materials Science, Minneapolis, MN, 55455, United States
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Abstract

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.

Keywords

Ninanoscalescanning probe microscopy (SPM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 976: Symposium EE – Size Effects in the Deformation of Materials – Experiments and Modeling , 2006 , 0976-EE09-05
Copyright
Copyright © Materials Research Society 2007

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