Effect of Crystal Transformation and Atomic Ordering on Friction and Wear of Two Cobalt-Base Alloys in Vacuum

Abstract

The effect of crystal and order-disorder transformations on friction and wear for Be-Co and FeCo alloys were studied in sliding friction experiments in vacuum at elevated temperatures. The results show that friction increases fourfold for the beryllium-cobalt alloy during transformation and that friction remains high until the reverse or cooling transformation occurs. The friction and wear of Be-Co are markedly superior to 440-C stainless steel. The order-disorder transformation in FeCo increases friction by a factor of 30 and also significantly increases wear. Increased sliding speed and loading affect the transformation. The friction behavior during heating is in good agreement with the type of order-temperature relation in FeCo.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1968
Accession Number
ADA382433

Entities

People

  • Donald H. Buckley
  • William A. Brainard

Organizations

  • National Aeronautics and Space Administration

Tags

DTIC Thesaurus Topics

  • Alloys
  • Bearings
  • Cobalt Alloys
  • Critical Temperature
  • Crystal Lattices
  • Crystal Structure
  • Diseases And Disorders
  • Gold Alloys
  • Iron
  • Materials
  • Mechanical Properties
  • Metals
  • Order Disorder Transformations
  • Solid Solutions
  • Stainless Steel
  • Steel
  • Vacuum

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).