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Article Dans Une Revue Scripta Materialia Année : 2020

On the mechanism of fatigue and dwell-fatigue crack initiation in Ti-6Al-4V

Résumé

In the present study, the mechanism of fatigue and dwell-fatigue crack initiation was investigated in Ti-6Al-4V with a bi-modal microstructure. While substantial dwell-fatigue life debit was evidenced, microstructural configurations associated with crack nucleation are similar and suggest a unique mechanism for fatigue and dwell-fatigue loadings. Pairs of α grains well oriented for basal slip and separated by a (0001) twist grain boundary were found to be critical configurations for crack initiation. Intense slip is localized at the boundary and precedes crack formation along this boundary. Data from a prior fatigue study was revisited and supports the occurrence of this mechanism.
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hal-03098859 , version 1 (22-08-2022)

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Paternité - Pas d'utilisation commerciale

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Cyril Lavogiez, Samuel Hémery, Patrick Villechaise. On the mechanism of fatigue and dwell-fatigue crack initiation in Ti-6Al-4V. Scripta Materialia, 2020, 183, pp.117-121. ⟨10.1016/j.scriptamat.2020.03.031⟩. ⟨hal-03098859⟩
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