Imperial College London
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ProfessorBaptisteGault

Faculty of Engineering, Department of Materials

Professor of Atomic-Scale Characterization
 
 
 
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Contact

 

b.gault

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{López:2022:10.1038/s41467-022-31964-3,
author = {López, Freixes M and Zhou, X and Zhao, H and Godin, H and Peguet, L and Warner, T and Gault, B},
doi = {10.1038/s41467-022-31964-3},
journal = {Nature Communications},
pages = {1--9},
title = {Revisiting stress-corrosion cracking and hydrogen embrittlement in 7xxx-Al alloys at the near-atomic-scale},
url = {http://dx.doi.org/10.1038/s41467-022-31964-3},
volume = {13},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The high-strength 7xxx series aluminium alloys can fulfil the need for light, high strength materials necessary to reduce carbon-emissions, and are extensively used in aerospace for weight reduction purposes. However, as all major high-strength materials, these alloys can be sensitive to stress-corrosion cracking (SCC) through anodic dissolution and hydrogen embrittlement (HE). Here, we study at the near-atomic-scale the intra- and inter-granular microstructure ahead and in the wake of a propagating SCC crack. Moving away from model alloys and non-industry standard tests, we perform a double cantilever beam (DCB) crack growth test on an engineering 7xxx Al-alloy. H is found segregated to planar arrays of dislocations and to grain boundaries that we can associate to the combined effects of hydrogen-enhanced localised plasticity (HELP) and hydrogen-enhanced decohesion (HEDE) mechanisms. We report on a Mg-rich amorphous hydroxide on the corroded crack surface and evidence of Mg-related diffusional processes leading to dissolution of the strengthening η-phase precipitates ahead of the crack.
AU  - López,Freixes M
AU  - Zhou,X
AU  - Zhao,H
AU  - Godin,H
AU  - Peguet,L
AU  - Warner,T
AU  - Gault,B
DO  - 10.1038/s41467-022-31964-3
EP  - 9
PY  - 2022///
SN  - 2041-1723
SP  - 1
TI  - Revisiting stress-corrosion cracking and hydrogen embrittlement in 7xxx-Al alloys at the near-atomic-scale
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/s41467-022-31964-3
UR  - https://www.ncbi.nlm.nih.gov/pubmed/35879282
UR  - https://www.nature.com/articles/s41467-022-31964-3
UR  - http://hdl.handle.net/10044/1/103844
VL  - 13
ER  -
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