Metallurgical Transactions A

, Volume 22, Issue 2, pp 377–391 | Cite as

The initiation and growth of fatigue cracks in a titanium aluminide alloy

  • D. L. Davidson
  • J. B. Campbell
  • R. A. Page
Mechanical Behaviour


The micromechanics of small, naturally initiated fatigue cracks and large through-thickness fatigue cracks have been studied in the titanium aluminide alloy Super Alpha 2. The microstructure investigated had equal volume fractions ofα 2 and Β phases. Crack growth rates were higher than through α-Β titanium alloys. Initiation of small cracks was found always to occur in theα 2 phase, and small cracks grew belowΔK th, the minimum cyclic stress intensity required for growth of large fatigue cracks. A method previously proposed for reconciling the growth rates of large and small cracks is applied to these results.


Metallurgical Transaction Fatigue Crack Crack Growth Rate Fatigue Crack Growth Small Crack 
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Copyright information

© The Minerals, Metals and Materials Society, and ASM International 1991

Authors and Affiliations

  • D. L. Davidson
    • 1
  • J. B. Campbell
    • 1
  • R. A. Page
    • 1
  1. 1.Southwest Research InstituteSan Antonio

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