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Mesoscale friction anisotropy revealed by slidingless tests

Published online by Cambridge University Press:  12 September 2011

James Annett
Affiliation:
School of Physics and Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland
Yanfei Gao*
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996; Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Graham L.W. Cross*
Affiliation:
School of Physics and Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland
Erik G. Herbert
Affiliation:
Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
Barry N. Lucas
Affiliation:
Fast Forward Devices, LLC, Knoxville, Tennessee 37931
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

Using a recently developed multidimensional nanocontact system designed for a quantitative measurement of lateral contact stiffness in the 10–106 N/m stiffness range (or 10–1000 nm contact size), we found a crystallographic-orientation-dependent lateral-stiffness reduction relative to the elastic prediction at contact sizes around 50 nm for polished Ni single crystal surface in air. The slidingless measurement is enabled by a frequency-specific, continuous stiffness measurement technique. Based on an interface microslip model and an anisotropic elastic contact analysis, the resulting friction stress is found to increase monotonically when the tested lateral direction rotates away from the closely packed direction.

Keywords

Type
Materials Communications
Copyright
Copyright © Materials Research Society 2011

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