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Nano-meter scale plasticity in KBr studied by nanoindenter and force microscopy

Published online by Cambridge University Press:  31 January 2011

Praveena Manimunda ,
Tobin Filleter ,
Philip Egberts ,
Vikram Jayaram ,
Sanjay Kumar Biswas  and
Roland Bennewitz
Praveena Manimunda
Affiliation:
praveena@platinum.materials.iisc.ernet.in, IISc, Bangalore, India
Tobin Filleter
Affiliation:
filleter@physics.mcgill.ca, McGill University, Montreal, Canada
Philip Egberts
Affiliation:
philip.egberts@inm-gmbh.de, INM, Saarbrücken, Germany
Vikram Jayaram
Affiliation:
qjayaram@materials.iisc.ernet.in, IISc, Bangalore, India
Sanjay Kumar Biswas
Affiliation:
skbis@mecheng.iisc.ernet.in, IISc, Bangalore, India
Roland Bennewitz
Affiliation:
roland.bennewitz@inm-gmbh.de, McGill University, Montreal, Canada
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Abstract

The early stages of plasticity in KBr single crystals have been studied by means of nanometer-scale indentation in complementary experiments using both a nanoindenter and an atomic force microscope. Nanoindentation experiments precisely correlate indentation depth and forces, while force microscopy provides high-resolution force measurements and images of the surface revealing dislocation activity. The two methods provide very similar results for the onset of plasticity in KBr. Upon loading we observe yield of the surface in atomic layer units which we attribute to the nucleation of single dislocations. Unloading is accompanied by plastic recovery as evident from a non-linear force distance unloading curve and delayed discrete plasticity events.

Keywords

nano-indentationscanning probe microscopy (SPM)dislocations
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1185: Symposium II – Probing Mechanics at Nanoscale Dimensions , 2009 , 1185-II07-08
Copyright
Copyright © Materials Research Society 2009

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