Crack arrest markings in stress corrosion cracking of 7xxx aluminium alloys: 
Insights into active hydrogen embrittlement mechanisms

López Freixes, Martí; Zhou, Xuyang; Aymerich-Armengol, Raquel; Vega-Paredes, Miguel; Peguet, Lionel; Warner, Timothy; Gault, Baptiste

doi:10.1016/j.scriptamat.2023.115690

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Crack arrest markings in stress corrosion cracking of 7xxx aluminium alloys: Insights into active hydrogen embrittlement mechanisms

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López Freixes, Martí
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Zhou, Xuyang
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
The University of Alabama, Department of Metallurgical Materials Engineering, 35487 Tuscaloosa, AL, USA;

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Aymerich-Armengol, Raquel
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Vega-Paredes, Miguel
Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Gault, Baptiste
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Imperial College, Royal School of Mines, Department of Materials, London, SW7 2AZ, UK;

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Citation

López Freixes, M., Zhou, X., Aymerich-Armengol, R., Vega-Paredes, M., Peguet, L., Warner, T., et al. (2023). Crack arrest markings in stress corrosion cracking of 7xxx aluminium alloys: Insights into active hydrogen embrittlement mechanisms. Scripta Materialia, 237: 115690. doi:10.1016/j.scriptamat.2023.115690.

Cite as: https://hdl.handle.net/21.11116/0000-000E-437C-C

Abstract

Crack growth in stress corrosion cracking (SCC) in 7xxx Al alloys is an intermittent process, which generates successive crack arrest markings (CAMs) visible on the fracture surface. It is conjectured that H is generated at the crack tip during crack arrest, which then facilitates crack advancement through hydrogen embrittlement. Here, nanoscale imaging by 4D-scanning-transmission electron microscopy and atom probe tomography show that CAMs are produced by oxidation at the arrested crack tip, matrix precipitates dissolve and solute diffuse towards the growing CAM. Substantial homogenous residual strain remains underneath the fracture surface, indicative of non-localized plastic activity. Our study suggests that H induces crack propagation through decohesion.