Fatigue crack growth characteristics and effect of microstructure in TiAl intermetallics

Rajappa Gnanamoorthy, Yoshiharu Mutoh, Naoya Masahashi, Yoji Mizuhara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Fatigue crack growth tests on four kinds of γ-base TiAl alloys with different microstructures were carried out. The basic mechanism of fatigue crack growth and the effect of microstructure on fatigue crack growth properties were discussed in detail. It was found that microcrack nucleation in the near crack tip region, growth and coalescence to a main crack are the dominant mechanism of fatigue crack growth. The fatigue crack growth resistance of lamellar microstructure material was higher than that of duplex microstructure material, which in turn was higher than that of equiaxed microstructure material. In the lamellar microstructure materials, crack growth resistance was low when the orientation of lamellar lath coincided with the crack growth direction. These differences in crack growth resistance might be induced by the stress shielding effect due to bridging on the crack wake.

Original languageEnglish
Pages (from-to)919-926
Number of pages8
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume45
Issue number8
DOIs
Publication statusPublished - 1996 Aug
Externally publishedYes

Keywords

  • Fatigue crack growth
  • Mechanism
  • Microstructure
  • Stress shielding
  • Titanium aluminide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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