The Recrystallization and Respheroidization of Tungsten Grains in a Tungsten-Heavy Alloy

Abstract

Refinement of the microstructure of tungsten-heavy alloys, specifically 90 W-7 Ni-3 Fe, has been achieved through heavy cold working followed by a heat treatment that recrystallized and respheroidized the tungsten grains. Hydrostatic extrusion of the alloy to reductions of area of 83% and 96% followed by isothermal annealing gives fine, spherical tungsten grains imbedded within the nickel-iron matrix. The finest grain size achieved was 15 microns for the 96% extrusion when subjected to an anneal at 1300 C for 2 hours. The apparent activation energy for the process was found to be 530 kJ/mole. This value indicates that volume diffusion is significant in respheroidizing the grains.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1989
Accession Number
ADA207647

Entities

People

  • Robert J. Dowding

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Annealing
  • Cold Working
  • Heat Of Activation
  • Heat Treatment
  • High Temperature
  • Liquid Phases
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Mechanics
  • Metallurgy
  • Military Research
  • Phase Diagrams
  • Powder Metallurgy
  • Sintering

Fields of Study

  • Materials science

Readers

  • Battery Technology and Engineering
  • Materials Science and Engineering.