Development and Producing of Bulk Nanostructured Refractory Metals using Equal Channel Angular Pressing and Theremomechanical Treatment

Abstract

The aim of current investigations has been producing of ultrafine-grained (UFG) structure in refractory and hard-to-deform metals - W and Ta - by means of severe plastic deformation (SPD), using equal-channel angular pressing (ECAP) and further thermo-mechanical treatments. The results of investigations on development and application of ECAP for microstructure refinement in W and are presented. Microstructure of the processed billets has been studied by the methods of optical and transmission electron microscopy (TEM) and the X-ray structural analysis. The influence of the number of passes on W microstructure evolution during the process of ECAP has been investigated. It has been shown, that the nanostructured state with a mean grain size equal to 100-200 nm is formed through additional high pressure torsion (HPT) in ECAP-processed W and . Fabrication of bulk W and Ta billets with UFG structure has a strong influence on mechanical behavior of processed metals.

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Document Details

Document Type
Technical Report
Publication Date
Apr 21, 2005
Accession Number
ADA524882

Entities

People

  • I. V. Alexandrov
  • R. Z. Valiev

Organizations

  • Ufa State Aviation Technical University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Advanced Materials
  • Electron Microscopy
  • Electrons
  • Fabrication
  • High Pressure
  • Low Temperature
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Metals
  • Microscopy
  • Microstructure
  • Plastic Deformation
  • Refractory Metals
  • Stresses
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics