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 http://resolver.caltech.edu/CaltechAUTHORS:20120123-152313648
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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.
|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. , itself an extension of the one originally written (and kindly provided) by Dr. Alexander Staroselsky and Prof. Lallit Anand at MIT . 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).|
|Subject Keywords:||Continuum model; Nanopillar; Crystal plasticity; Dislocation starvation|
|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.|
|Deposited By:||Tony Diaz|
|Deposited On:||24 Jan 2012 00:35|
|Last Modified:||24 Jan 2012 00:35|
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