Abstract
Fatigue crack initiation in an aligned structure of Ti-6Al-4V was investigated. Slip line cracking in the α phase was shown to be responsible for failure when surface origins dominated. It is suggested from fractographic and metallographic evidence that the same initiation mechanism produced internal origins during high cycle fatigue. The presence of an interface layer in the structure separating the α and β plates did not play a significant role in crack initiation. The local misorientation of adjacent α plates over an intercolony boundary was found to be the controlling factor.
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