THE INFLUENCE OF MICROSTRUCTURE ON THE FRACTURE TOPOGRAPHY OF TITANIUM ALLOYS

Abstract

A survey is presented of the fracture topography observed in titanium and titanium alloys. Ductile fracture by microvoid nucleation, growth, and coalescence is of widespread occurrence in these alloys. It is usually possible to qualitatively relate the dimple size to the macroscopic ductility of the alloy. Titanium alloys may be embrittled by alloying additions that, in most cases, lead to a fine dispersion of second-phase particles. In alpha-phase alloys, this brittleness is associated with cleavage fracture. However, beta-phase alloys, which exhibit cleavage-like macroscopic behavior, show evidence of small dimples when observed using a microscope. Environment often dramatically affects the fracture behavior of titanium alloys, producing low-energy cleavage-like failures in alpha and beta phases, which are normally ductile.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1968
Accession Number
AD0685379

Entities

People

  • James C. Williams
  • Martin J. Blackburn
  • Rodney R. Boyer

Organizations

  • Boeing Commercial Airplanes

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Alloys
  • Aluminum
  • Brittleness
  • Heat Treatment
  • Hydrogen Embrittlement
  • Materials
  • Mechanical Properties
  • Metals
  • Microscopes
  • Nucleation
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Stresses
  • Titanium Alloys
  • Topography
  • Transitions

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.