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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.

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Caltech Authors  


Marian, Jaime -  Knap, Jaroslaw -  Ortiz, Michael - 

Id.: 70526475

Versión: 1.0

Estado: Final

Tipo de recurso: Article  -  PeerReviewed  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://resolver.caltech.edu/CaltechAUTHORS:20171128-110626684
[References] https://authors.library.caltech.edu/83512/

Fecha de contribución: 01-dic-2017


* 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. http://resolver.caltech.edu/CaltechAUTHORS:20171128-110626684

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