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Scale-dependent pop-ins in nanoindentation and scale-free plastic fluctuations in microcompression

Published online by Cambridge University Press:  10 January 2020

John Shimanek ,
Quentin Rizzardi ,
Gregory Sparks ,
Peter M. Derlet  and
Robert Maaß Open the ORCID record for Robert Maaß [Opens in a new window]
John Shimanek
Affiliation:
Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Quentin Rizzardi
Affiliation:
Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Gregory Sparks
Affiliation:
Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Peter M. Derlet
Affiliation:
Condensed Matter Theory Group, Paul Scherrer Institute, Villigen-PSI 5232, Switzerland
Robert Maaß*
Affiliation:
Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Nanoindentation and microcrystal deformation are two methods that allow probing size effects in crystal plasticity. In many cases of microcrystal deformation, scale-free and potentially universal intermittency of event sizes during plastic flow has been revealed, whereas nanoindentation has been mainly used to assess the stress statistics of the first pop-in. Here, we show that both methods of deformation exhibit fundamentally different event-size statistics obtained from plastic instabilities. Nanoindentation results in scale-dependent intermittent microplasticity best described by Weibull statistics (stress and magnitude of the first pop-in) and lognormal statistics (magnitude of higher-order pop-ins). In contrast, finite-volume microcrystal deformation of the same material exhibits microplastic event-size intermittency of truncated power-law type even when the same plastic volume as in nanoindentation is probed. Furthermore, we successfully test a previously proposed extreme-value statistics model that relates the average first critical stress to the shape and scale parameter of the underlying Weibull distribution.

Keywords

nanoindentationmicrostructurecrystal
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 2 , 28 January 2020 , pp. 196 - 205
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Copyright
Copyright © Materials Research Society 2020

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