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

Ercan Gurses, Tamer S. El Sayed

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)3391-3395
Number of pages5
JournalMaterials Letters
Volume65
Issue number23-24
DOIs
StatePublished - Dec 2011

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)
  • Mechanical Engineering
  • Condensed Matter Physics

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