Nanoengineering Applied to Tungsten

Abstract

We have investigated the microstructure and mechanical properties of fully dense tungsten with ultrafine-grained (UFG) and nanocrystalline (NC) microstructure. The UFG/NC tungsten was processed by severe plastic deformation at low homologous temperatures (T/Tm). To obtain the UFG microstructure, a combination of equal channel angular pressing at relatively high temperatures followed by rolling at lower temperatures was employed, which resulted in an average grain size of ~500 nm. To obtain the nanocrystalline microstructure (grain size ~100 nm and below), high-pressure torsion was utilized. Our experimental results show that the UFG/NC microstructures not only significantly elevate the strength of tungsten, they also re-instate its ductility, decrease its strain rate sensitivity, and reduce its work hardening capability. These factors work together to greatly enhance the susceptibility of tungsten to adiabatic localization under uni-axial dynamic loading.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2006
Accession Number
ADA451739

Entities

People

  • Brian E. Schuster
  • E. Ma
  • K. C. Cho
  • K. T. Ramesh
  • L. J. Kecskes
  • L. S. Magness
  • Qiuming Wei
  • R. J. Dowding
  • R. Z. Valiev

Organizations

  • University of North Carolina at Charlotte

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Department Of Defense
  • Elements
  • Grain Size
  • High Pressure
  • High Temperature
  • Mechanical Engineering
  • Mechanical Properties
  • Metals
  • Microstructure
  • Military Research
  • North Carolina
  • Powder Metals
  • Powders
  • Refractory Metals
  • Tungsten
  • Ultrafines
  • Universities

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Powder metallurgy of Titanium alloys.