Microstructurally Based Cross-slip Mechanisms and Their Effects on Dislocation Microstructure Evolution in fcc Crystals

Abstract

Three newly identified cross-slip mechanisms from atomistic simulations of fcc crystals, namely surface, bulk and intersection cross-slip types, were hierarchically informed into discrete dislocation dynamics simulations. The influence of each cross-slip type on the evolution of the dislocation microstructure in face-centered cubic microcrystals having different crystal sizes and initial dislocation densities was investigated. Dislocation pattern formation, surface slip localization and initial strain hardening were observed, in agreement with experimental observations, and possible explanations are given in the light of these simulations.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2015
Accession Number
ADA617363

Entities

People

  • Ahmed M. Hussein
  • Dennis M. Dimiduk
  • Jaafar A El-Awady
  • Michael D. Uchic
  • S.I. Rao

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Computational Science
  • Computer Programs
  • Crystal Structure
  • Crystals
  • Dynamics
  • Electron Microscopy
  • Hardening
  • Mechanical Properties
  • Mechanics
  • Microstructure
  • Molecular Dynamics
  • Personal Information Managers
  • Physics
  • Shear Stresses
  • Simulations
  • Strain Hardening
  • Three Dimensional

Readers

  • Materials Science and Engineering.