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Three-dimensional characterization of fatigue-relevant intermetallic particles in high-strength aluminium alloys using synchrotron X-ray nanotomography

Abstract : Second-phase particles and small porosities are known to favour fatigue crack initiation in high-strength aluminium alloys 2050-T8 and 7050-T7451. Using high-resolution X-ray tomography (320 nm voxel size), with Paganin reconstruction algorithms, the probability that large clusters of particles contain porosities could be measured for the first time in 3D, as well as precise 3D size distributions. Additional holotomography imaging provided improved spatial resolution (50 nm voxel size), allowing to estimate the probability of finding cracked particles in the as-received material state. The extremely precise 3D shape (including cracks) as well as local chemistry of the particles has been determined. This experiment enabled unprecedented 3D identification of detrimental stress risers relevant for fatigue in as-received aluminium alloys.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01237840
Contributor : Bibliothèque Umr7633 <>
Submitted on : Thursday, December 3, 2015 - 5:58:23 PM
Last modification on : Friday, June 11, 2021 - 1:00:03 PM

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Erembert Nizery, Jean-Yves Buffiere, Henry Proudhon, Peter Cloetens, Thilo F. Morgeneyer, et al.. Three-dimensional characterization of fatigue-relevant intermetallic particles in high-strength aluminium alloys using synchrotron X-ray nanotomography. Philosophical Magazine, Taylor & Francis, 2015, 95, pp.2731-2746. ⟨10.1080/14786435.2015.1076940⟩. ⟨hal-01237840⟩

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