Discrete Dislocation Dynamics Simulations of Twin Size-Effects in Magnesium

Abstract

A dislocation--{1012} twin boundary (TB) interaction model was proposed and introduced into discrete dislocation dynamics simulations to study the mechanical behavior of micro-twinned Mg. Strong strain hardening was captured by current simulations, which is associated with the strong TB's barrier effect. In addition, twin size effects with small TB spacing leading to a strong yield stress, were observed to be orientation dependent. Basal slip orientation produces a strong size effect, while prismatic slip does a weak one.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2015
Accession Number
ADA626999

Entities

People

  • A. Arsenlis
  • Haidong Fan
  • Jaafar A El-Awady
  • Sylvie Aubry

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Boundaries
  • Crystal Structure
  • Crystals
  • Dislocations
  • Dynamics
  • Engineering
  • Law
  • Magnesium
  • Materials
  • Mechanical Engineering
  • Mechanics
  • Molecular Dynamics
  • Orientation (Direction)
  • Plastic Properties
  • Simulations
  • Subatomic Particles

Readers

  • Computational Fluid Dynamics (CFD)
  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.

Technology Areas

  • Space