Understanding the threshold conditions for dislocation transmission from tilt grain boundaries in FCC metals under uniaxial loading

Nathaniel James Burbery, Raj Das, Giacomo Po, Nasr Ghoniem

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Plastic deformation in face-centred cubic (or 'FCC') metals involves multi-scale phenomena which are initiated at atomic length and time scales (on order of 1.0e-15 seconds). Understanding the fundamental thresholds for plasticity at atomic and nano/meso scales requires rigorous testing, which cannot be feasibly achieved with current experimental methods. Hence, computer simulation-based investigations are extremely valuable. However, meso-scale simulations cannot yet accommodate atomically-informed grain boundary (or 'GB') effects and dislocation interactions. This study will provide a stress - strain analysis based on molecular dynamics simulations of a series of metastable grain boundaries with identical crystal orientations but unique grain boundary characteristics. Relationships between dislocation slip systems, resolved shear stresses and additional thermo-mechanical conditions of the system will be considered in the analysis of dislocation-grain boundary interactions, including GB penetration. This study will form the basis of new phenomenological relationships in an effort to enable accommodation of grain boundaries into meso scale dislocation dynamic simulations.

Original languageEnglish (US)
Title of host publicationAdvances in Computational Mechanics
PublisherTrans Tech Publications
Pages28-34
Number of pages7
ISBN (Print)9783038350682
DOIs
StatePublished - 2014
Externally publishedYes
Event1st Australasian Conference on Computational Mechanics, ACCM 2013 - Sydney, NSW, Australia
Duration: Oct 3 2013Oct 4 2013

Publication series

NameApplied Mechanics and Materials
Volume553
ISSN (Print)1660-9336
ISSN (Electronic)1662-7482

Conference

Conference1st Australasian Conference on Computational Mechanics, ACCM 2013
Country/TerritoryAustralia
CitySydney, NSW
Period10/3/1310/4/13

Keywords

  • Coincidence site lattice
  • Dislocation-loop glide
  • Grain boundary penetrability
  • Molecular dynamics
  • Multi-scale modeling
  • Non-schmid
  • Plastic deformation

ASJC Scopus subject areas

  • Engineering(all)

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