Nanotwins in Nanocrystalline Mg-Al Alloys: An Insight from High-Resolution TEM and Molecular Dynamics Simulation

Abstract

Twinning in hexagonal close-packed Mg alloys has been reported to be unfavorable when the grain size is reduced below a couple of microns and suppressed at the nanoscale. Using high-resolution transmission electron microscopy, we present evidence of nanotwins (<1 nm) in nanocrystalline Mg Al alloys processed by cryomilling. The commonly observed twinning modes for coarse-grained Mg are identified and supported with atomistic molecular dynamics simulations. The specific thermomechanical conditions offered by cryomilling facilitate the generation of deformation twins that are not observed with conventional deformation processing methods.

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Document Details

Document Type
Technical Report
Publication Date
Sep 25, 2013
Accession Number
ADA603337

Entities

People

  • B. Li
  • Jeremy Yang
  • M. Pozuelo
  • S. N. Mathaudhu
  • Seungchan Kim
  • W. H. Kao

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Crystal Structure
  • Density Functional Theory
  • Electron Microscopy
  • Grain Size
  • High Resolution
  • Low Temperature
  • Materials
  • Materials Science
  • Mechanical Properties
  • Microscopy
  • Military Research
  • Molecular Dynamics
  • Plastic Deformation
  • Simulations
  • Strain Rate
  • Transmission Electron Microscopy

Fields of Study

  • Physics

Readers

  • Nanoscale Plasmonic Nanotechnology
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics