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Published January 2012 | public
Journal Article Metadata-only

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

Jérusalem, Antoine
Fernández, Ana ORCID icon
Kunz, Allison
Greer, Julia R. ORCID icon
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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.

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).

Additional details

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August 22, 2023
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October 24, 2023