Plasticity, healing and shakedown in sharp-asperity nanoindentation

Nature Materials
Graham L W CrossUrs T Dürig

Abstract

Spatially localized stress fields produced by instrumented, sharp indentation probes are a route to testing the mechanical properties of materials at the smallest length scales. Here we provide direct experimental measurement of indentation plasticity with contact strain fields involving up to a few thousand atoms. We observe two types of nanoscale plasticity: on the pristine surface, high-resolution sensing shows an overall smooth, remarkably reversible indentation response interjected by sudden discrete drops in indenter load. The jumps often occur in pairs with pop-in motion during loading healed by a corresponding pop-out motion on the unload stroke to define a compact hysteresis loop. Despite the general reversibility, cyclic indentation at a single sample position leads to a subtle plastic ratchet and shakedown behaviour with displacements correlated to the underlying gold lattice constant. Our results concur with a previously established picture of thermally activated atomistic plasticity, but suggest a new mechanism at reduced scales that suppresses permanent mass transport.

References

Jul 15, 1987·Physical Review. B, Condensed Matter·J K Gimzewski, R Möller
Jul 16, 1990·Physical Review Letters·U DürigD W Pohl
Feb 26, 1996·Physical Review Letters·L OlesenF Besenbacher
Apr 6, 2001·Physical Review Letters·R van GastelJ W Frenken
Jan 22, 2003·Ultramicroscopy·A Fian, M Leisch
Jul 15, 2003·Physical Review Letters·J Knap, M Ortiz
Jun 17, 2005·Nature·Binquan Luan, Mark O Robbins
Apr 1, 2006·Proceedings of the National Academy of Sciences of the United States of America·J FraxedasF Sanz

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Citations

Nov 7, 2012·Proceedings of the National Academy of Sciences of the United States of America·David J OliverPeter Grütter
Mar 29, 2014·Physical Chemistry Chemical Physics : PCCP·William PaulPeter Grütter
Oct 10, 2006·Physical Review Letters·André SchirmeisenHarald Fuchs
Mar 16, 2007·Physical Review Letters·D ChrobakR Nowak
Mar 21, 2008·Physical Review Letters·V NavarroJ M Rojo
Jun 3, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·V NavarroJ M Rojo
Jul 28, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Makoto TadokoroKyosuke Isoda
Nov 18, 2018·Nanotechnology·Sai Bharadwaj VishnubhotlaTevis D B Jacobs
Dec 3, 2010·Nano Letters·Jianfeng ZangXiaodong Li

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