On Fatigue Crack Growth in a Ti-4.5Al-5Mo-1.5Cr Alloy with Metastable Beta-Phase.

Abstract

Fatigue crack growth behavior has been examined in a Ti-4.5Al-5Mo-1.5Cr alloy, for two different levels of beta-phase metastability. The resistance to fatigue crack growth appears to be marginally enhanced with the presence of metastable beta-phase in a microstructure also containing some primary alpha-phase (approx 30 pct) of high aspect ratio. This enhancement appears slightly greater for beta-phase water quenched from 899 deg C, than as more slowly cooled in helium from this same solution treatment temperature, at approximately an air-cooling rate. In the case of the former, nearly full retention of solute in the beta-phase is apparent, while in the latter, significant precipitation of secondary alpha-phase is evident in thin-foil transmission electron micrographs. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 10, 1983
Accession Number
ADA128048

Entities

People

  • Charles M. Gilmore
  • George R. Yoder
  • M. Ashraf Imam

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Aspect Ratio
  • Beta Testing
  • Crack Propagation
  • Fatigue Life
  • Mechanical Properties
  • Mechanics
  • Military Research
  • Resistance
  • Standards
  • Stresses
  • Tensile Properties
  • Tensile Strength
  • Test Methods
  • Titanium
  • Titanium Alloys
  • Yield Strength

Fields of Study

  • Materials science
  • Physics

Readers

  • Exercise and Sports Science.
  • Materials Science and Engineering.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Microelectronics