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Continuum modeling of dislocation starvation and subsequent nucleation in nano-pillar compressions

Jérusalem, Antoine and Fernández, Ana and Kunz, Allison and Greer, Julia R. (2012) Continuum modeling of dislocation starvation and subsequent nucleation in nano-pillar compressions. Scripta Materialia, 66 (2). pp. 93-96. ISSN 1359-6462. doi:10.1016/j.scriptamat.2011.10.009. https://resolver.caltech.edu/CaltechAUTHORS:20120123-152313648

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Abstract

The mechanical behavior of single crystalline aluminum nano-pillars under uniaxial compression differs from bulk Al in that the former is characterized by a smoother transition from elasticity to plasticity. We propose an extension of the phenomenological model of dislocation starvation originally proposed in [Greer and Nix, Phys. Rev. B 73 (2006) 245410] additionally accounting for dislocation nucleation. The calibrated and validated continuum model successfully captures the intrinsic mechanisms leading to the transition from dislocation starvation to dislocation nucleation in fcc nano-pillars.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.scriptamat.2011.10.009 DOIArticle
http://www.sciencedirect.com/science/article/pii/S1359646211005999PublisherArticle
ORCID:
AuthorORCID
Fernández, Ana0000-0001-6825-0426
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2011 Acta Materialia Inc. Published by Elsevier Ltd. Received 24 September 2011. Revised 4 October 2011. Accepted 5 October 2011. Available online 10 October 2011. The Abaqus subroutine VUMAT used here is a modified version of the one used for HCP metals in Ref. [31], itself an extension of the one originally written (and kindly provided) by Dr. Alexander Staroselsky and Prof. Lallit Anand at MIT [24]. A.J. acknowledges support from the Juan de la Cierva grant from the Spanish Ministry of Science and Innovation, from the Amarout grant from the European Union and from the ESTRUMAT-S2009/MAT-1585 grant (Madrid Regional Government). A.F. acknowledges funding from the Caltech SURF program. J.R.G. gratefully acknowledges the financial support of the National Science Foundation through the CAREER award (DMR-0748267) and Office of Naval Research (Grant No. N000140910883).
Funders:
Funding AgencyGrant Number
Spanish Ministry of Science and Innovation Juan de la Cierva GrantUNSPECIFIED
European Union Amarout GrantUNSPECIFIED
Madrid Regional GovernmentESTRUMAT-S2009/MAT-1585
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
NSFDMR-0748267
Office of Naval Research (ONR)N000140910883
Subject Keywords:Continuum model; Nanopillar; Crystal plasticity; Dislocation starvation
Issue or Number:2
DOI:10.1016/j.scriptamat.2011.10.009
Record Number:CaltechAUTHORS:20120123-152313648
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120123-152313648
Official Citation:Antoine Jérusalem, Ana Fernández, Allison Kunz, Julia R. Greer, Continuum modeling of dislocation starvation and subsequent nucleation in nano-pillar compressions, Scripta Materialia, Volume 66, Issue 2, January 2012, Pages 93-96, ISSN 1359-6462, 10.1016/j.scriptamat.2011.10.009.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28925
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Jan 2012 00:35
Last Modified:09 Nov 2021 17:02

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