A discrete dislocation plasticity analysis of grain-size strengthening

DS Balint*, VS Deshpande, A Needleman, E Van der Giessen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

43 Citations (Scopus)
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Abstract

The dependence of shear yield strength on grain size is analyzed using discrete dislocation dynamics. Plastic deformation is modeled through the motion of edge dislocations in an elastic solid. The lattice resistance to dislocation motion, dislocation nucleation, dislocation interaction with obstacles and dislocation annihilation are incorporated through a set of constitutive rules. Grain boundaries are modeled as impenetrable to dislocations. Single slip is assumed within each grain and a checkerboard-like arrangement of grains is used as a unit cell for the polycrystal. Doubly-periodic pure shear calculations are carried out for planar polycrystals with grain sizes in the range 0.2 mu m

Original languageEnglish
Pages (from-to)186-190
Number of pages5
JournalMaterials science and engineering a-Structural materials properties microstructure and processing
Volume400
Issue number6
DOIs
Publication statusPublished - 25-Jul-2005
EventIntenational Conference on Fundamentals of Plastic Deformation - , France
Duration: 13-Sep-200417-Sep-2004

Keywords

  • discrete dislocations
  • mechanical properties
  • pure shear
  • plasticity
  • polycrystalline materials
  • computer simulations
  • SIMULATION
  • BEHAVIOR

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