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Journal of Materials Science

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01-03-2007 | Nano May 2006

Grain size dependence of strength of nanocrystalline materials as exemplified by copper: an elastic-viscoplastic modelling approach

Authors: S. Mercier, A. Molinari, Y. Estrin

Published in: Journal of Materials Science | Issue 5/2007

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Abstract

The purpose of this work is to model the mechanical behavior of nanocrystalline materials. Based on previous rigid viscoplastic models proposed by Kim et al. (Acta Mater, 48: 493, 2000) and Kim and Estrin (Acta Mater, 53: 765, 2005), the nanocrystalline material is described as a two phase composite material. Using the Taylor–Lin homogenisation scheme in order to account for elasticity, the yield stress of nanocrystalline materials can be evaluated. The transition from a Hall–Petch relation to an inverse Hall–Petch relation is defined and is related to a change in plastic deformation mode in the crystallite phase from a dislocation glide driven mechanism to a diffusion-controlled process.

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Title: Grain size dependence of strength of nanocrystalline materials as exemplified by copper: an elastic-viscoplastic modelling approach
Authors: S. Mercier
A. Molinari
Y. Estrin
Publication date: 01-03-2007
Publisher: Kluwer Academic Publishers-Plenum Publishers
Published in: Journal of Materials Science / Issue 5/2007
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-006-0670-y

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Other articles of this Issue 5/2007

Dynamics of nanoscale grain-boundary decohesion in aluminum by molecular-dynamics simulation

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Characteristics of face-centered cubic metals processed by equal-channel angular pressing

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The development of hardness homogeneity in aluminum and an aluminum alloy processed by ECAP

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