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Anisotropy of Nanoindentation – a tool for the determination of nanocrystal orientation ?

Published online by Cambridge University Press:  15 February 2011

David Christopher ,
Steven Kenny ,
Roger Smith ,
Asta Richter ,
Bodo Wolf  and
Bruce King
David Christopher
Affiliation:
Mathematical, Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.
Steven Kenny
Affiliation:
Mathematical, Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.
Roger Smith
Affiliation:
Mathematical, Sciences, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.
Asta Richter
Affiliation:
Engineering Physics, University of Applied Sciences, Wildau, Bahnhofstrasse, 15745 Wildau, Germany.
Bodo Wolf
Affiliation:
Engineering Physics, University of Applied Sciences, Wildau, Bahnhofstrasse, 15745 Wildau, Germany.
Bruce King
Affiliation:
Physics Department, University of Newcastle, Callaghan, NSW 2308, Australia.
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Abstract

The pile up patterns arising in nanoindentation are shown to be indicative of the sample crystal symmetry. To explain and interpret these patterns, complementary molecular dynamics simulations and experiments have been performed to determine the atomistic mechanisms of the nanoindentation process in single crystal Fe{110}. The simulations show that dislocation loops start from the tip and end on the crystal surface propagating outwards along the four in-plane <111> directions. These loops carry material away from the indenter and form bumps on the surface along these directions separated from the piled-up material around the indenter hole. Atoms also move in the two out-of-plane <111> directions causing propagation of subsurface defects and pile-up around the hole. This finding is confirmed by scanning force microscopy mapping of the imprint, the piling-up pattern proving a suitable indicator of the surface crystallography. Experimental force-depth curves over the depth range of a few nanometers do not appear smooth and show distinct pop-ins. On the sub-nanometer scale these pop-ins are also visible in the simulation curves and occur as a result of the initiation of the dislocation loops from the tip.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 779: Symposium W – Multiscale Phenomena in Materials - Experiments and Modeling Related to Mechanical Behavior , 2003 , W5.14
Copyright
Copyright © Materials Research Society 2003

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