A constitutive model of nanocrystalline metals based on competing grain boundary and grain interior deformation mechanisms

Ercan Gurses; Tamer S. El Sayed

doi:10.1016/j.matlet.2011.07.039

A constitutive model of nanocrystalline metals based on competing grain boundary and grain interior deformation mechanisms

Ercan Gurses, Tamer S. El Sayed

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11 Scopus citations

Abstract

In this work, a viscoplastic constitutive model for nanocrystalline metals is presented. The model is based on competing grain boundary and grain interior deformation mechanisms. In particular, inelastic deformations caused by grain boundary diffusion, grain boundary sliding and dislocation activities are considered. Effects of pressure on the grain boundary diffusion and sliding mechanisms are taken into account. Furthermore, the influence of grain size distribution on macroscopic response is studied. The model is shown to capture the fundamental mechanical characteristics of nanocrystalline metals. These include grain size dependence of the strength, i.e., both the traditional and the inverse Hall-Petch effects, the tension-compression asymmetry and the enhanced rate sensitivity. © 2011 Elsevier B.V. All rights reserved.

Original language	English (US)
Pages (from-to)	3391-3395
Number of pages	5
Journal	Materials Letters
Volume	65
Issue number	23-24
DOIs	https://doi.org/10.1016/j.matlet.2011.07.039
State	Published - Dec 2011

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was fully funded by the KAUST baseline fund.

ASJC Scopus subject areas

Mechanics of Materials
General Materials Science
Mechanical Engineering
Condensed Matter Physics

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10.1016/j.matlet.2011.07.039

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title = "A constitutive model of nanocrystalline metals based on competing grain boundary and grain interior deformation mechanisms",

abstract = "In this work, a viscoplastic constitutive model for nanocrystalline metals is presented. The model is based on competing grain boundary and grain interior deformation mechanisms. In particular, inelastic deformations caused by grain boundary diffusion, grain boundary sliding and dislocation activities are considered. Effects of pressure on the grain boundary diffusion and sliding mechanisms are taken into account. Furthermore, the influence of grain size distribution on macroscopic response is studied. The model is shown to capture the fundamental mechanical characteristics of nanocrystalline metals. These include grain size dependence of the strength, i.e., both the traditional and the inverse Hall-Petch effects, the tension-compression asymmetry and the enhanced rate sensitivity. {\textcopyright} 2011 Elsevier B.V. All rights reserved.",

author = "Ercan Gurses and {El Sayed}, {Tamer S.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: This work was fully funded by the KAUST baseline fund.",

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AU - El Sayed, Tamer S.

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AB - In this work, a viscoplastic constitutive model for nanocrystalline metals is presented. The model is based on competing grain boundary and grain interior deformation mechanisms. In particular, inelastic deformations caused by grain boundary diffusion, grain boundary sliding and dislocation activities are considered. Effects of pressure on the grain boundary diffusion and sliding mechanisms are taken into account. Furthermore, the influence of grain size distribution on macroscopic response is studied. The model is shown to capture the fundamental mechanical characteristics of nanocrystalline metals. These include grain size dependence of the strength, i.e., both the traditional and the inverse Hall-Petch effects, the tension-compression asymmetry and the enhanced rate sensitivity. © 2011 Elsevier B.V. All rights reserved.

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JO - Materials Letters

JF - Materials Letters

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ER -

A constitutive model of nanocrystalline metals based on competing grain boundary and grain interior deformation mechanisms

Abstract

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