Severe Plastic Deformation Processing of Refractory Metals by Equal Channel Angular Extrusion

Abstract

Research efforts to develop high density refractory metals, such as Ta and W, have to a certain extent been hindered by the inability to thermomechanically process the materials to achieve key properties necessary for adequate performance, namely consistent mechanical behavior. The work presented here demonstrates the potential for W, Ta, and other polycrystalline refractory metals to be processed via equal channel angular extrusion (ECAE) to have nanocrystalline microstructures and improved mechanical behavior. Microscopy of the ECAE processed W and Ta show ~300 nm grains in the worked state and enhanced mechanical behavior. Other processing-microstructure-property relationships correlating processing, microstructure, and microhardness are reported here.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2008
Accession Number
ADA505672

Entities

People

  • H. E. Maupin
  • K. T. Hartwig
  • L. J. Kecskes
  • Q.-m. Wei
  • S. N. Mathaudhu

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Crystal Structure
  • Electron Microscopy
  • Elements
  • Explosively Formed Penetrators
  • Extrusion
  • Grain Size
  • Hardening
  • Hardness
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Metals
  • Microhardness
  • Microscopy
  • Microstructure
  • Refractory Metals

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.