Investigation of Subcritical Fatigue Crack Growth in Gamma Titanium Aluminides

Abstract

Our titanium aluminide alloy was readily heat treated to a fully lamellar state by holding at 1345C for 1.5 hours and furnace cooling resulting in a grain size of 330 muon m. The yield stress, ultimate stress, and total elongation were 315MPa, 465MPa, and 0.46% respectively. The fully lamellar microstructure shows significant work hardening. No long cracks initiated at R=0.1 and variation max=300MPa with up to 1.4 million cycles.

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Document Details

Document Type
Technical Report
Publication Date
May 26, 2004
Accession Number
ADA423542

Entities

People

  • Blair London

Organizations

  • California Polytechnic State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Aluminides
  • Chemistry
  • Crystal Structure
  • Elements
  • Elongation
  • Energy Bands
  • Grain Boundaries
  • Grain Size
  • Materials
  • Materials Engineering
  • Mechanical Properties
  • Mechanics
  • Microstructure
  • Titanium
  • Titanium Aluminide
  • Transition Metals

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Solar Physics
  • Structural Health Monitoring of Composite Structures.