SOME OBSERVATIONS ON THE STRESS-CORROSION CRACKING OF THREE COMMERCIAL TITANIUM ALLOYS

Abstract

Stress-corrosion cracking was studied in commercial titanium alloys Ti-8Al-1Mo-1V, Ti-6Al-4V, and Ti-4Al-3Mo-1V. Electron fractography was used in conjunction with electron metallography to establish the fracture path. A sharp transition from ductile to cleavage failure occurs in the alpha phase between 4 and 6 weight percent aluminum, while the beta phase fails by ductile rupture in all cases. Thin-foil electron microscopy was used to show that the dislocation arrangements produced in the alpha phase range from tangles in the 4 weight percent aluminum alloy to coplanar arrays in the 6 and 8 weight percent alloys. The relation between dislocation arrangements and fracture mode offers a qualitative explanation of the variations in environmental susceptibility of various titanium alloys.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1967
Accession Number
AD0661812

Entities

People

  • James C. Williams

Organizations

  • Boeing Commercial Airplanes

Tags

DTIC Thesaurus Topics

  • Aircrafts
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Beta Testing
  • Chemistry
  • Commercial Aircraft
  • Corrosion
  • Electron Microscopy
  • Fracture (Mechanics)
  • Heat Treatment
  • Materials
  • Mechanics
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Titanium
  • Titanium Alloys

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Surface Coatings Technology.
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics