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Nanovoid deformation in aluminum under simple shear

Marian, Jaime and Knap, Jaroslaw and Ortiz, Michael (2005) Nanovoid deformation in aluminum under simple shear. Acta Materialia, 53 (10). pp. 2893-2900. ISSN 1359-6454. doi:10.1016/j.actamat.2005.02.046.

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We analyze the mechanisms underlying the deformation of a nanovoid in an Al crystal subjected to cyclic shear deformation using numerical simulations. Boundary and cell-size effects have been minimized by means of the quasicontinuum method. The deformation of the void entails a noticeable reduction in volume. During the loading phase, our analysis reveals several stages of stress buildup separated by yield points. The main mechanisms underlying the deformation of the crystal are: glide of primary and secondary partial dislocation loops with mixed edge-screw character; intersection of primary and secondary loops to form jogs and junctions; cross-slip; and dislocation multiplication and annihilation. Cross-slip occurs by the Fleischer mechanism and not by the more commonly assumed Friedel–Escaig mechanism. During unloading, most of the dislocation population and void volume reduction is recovered by re-absorption of dislocation loops and annihilation mediated by cross slip. However, a residual dislocation density remains around the void at the end of the unloading process.

Item Type:Article
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URLURL TypeDescription
Ortiz, Michael0000-0001-5877-4824
Additional Information:© 2005 Acta Materialia Inc. Published by Elsevier. Received 2 February 2005, Revised 19 February 2005, Accepted 22 February 2005, Available online 9 April 2005. Support from DOE through Caltech’s ASC/ASAP Center for the Simulation of the Dynamic Response of Materials is gratefully acknowledged.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:Quasicontinuum; Aluminum; Dislocations; Cross-slip; Ductile fracture
Issue or Number:10
Record Number:CaltechAUTHORS:20171128-110626684
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Official Citation:Jaime Marian, Jaroslaw Knap, Michael Ortiz, Nanovoid deformation in aluminum under simple shear, In Acta Materialia, Volume 53, Issue 10, 2005, Pages 2893-2900, ISSN 1359-6454, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83512
Deposited By: Lydia Suarez
Deposited On:30 Nov 2017 00:05
Last Modified:15 Nov 2021 20:11

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