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

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

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 cont...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) Vol. 95; no. 25; pp. 2731 - 2746
Main Authors: Nizery, E., Proudhon, H., Buffiere, J.-Y., Cloetens, P., Morgeneyer, T.F., Forest, S.
Format: Journal Article
Language:English
Published: Taylor & Francis 02-09-2015
Subjects:
3D characterization
Algorithms
aluminium alloys
Aluminum base alloys
Condensed Matter
fatigue crack initiation
intermetallics
Materials Science
Nanostructure
Physics
Porosity
Reconstruction
Risers
Three dimensional
X-ray tomography
X-rays
X-ray tomography
intermetallics
aluminium alloys
fatigue crack initiation
3D characterization
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Summary: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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ISSN:1478-6435
1478-6443
1478-6433
DOI:10.1080/14786435.2015.1076940