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

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000E-437C-C Version Permalink: https://hdl.handle.net/21.11116/0000-000E-437E-A
Genre: Journal Article

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 Creators:
López Freixes, Martí1, Author           
Zhou, Xuyang1, 2, Author           
Aymerich-Armengol, Raquel3, Author           
Vega-Paredes, Miquel3, Author           
Peguet, Lionel4, Author
Warner, Timothy4, Author
Gault, Baptiste1, 5, Author           
Affiliations:
1Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
2The University of Alabama, Department of Metallurgical Materials Engineering, 35487 Tuscaloosa, AL, USA, ou_persistent22              
3Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2054294              
4C-TEC, Constellium Technology Center, Parc Economique Centr'alp, CS, 10027, Voreppe, 38341 cedex, France, ou_persistent22              
5Imperial College, Royal School of Mines, Department of Materials, London, SW7 2AZ, UK, ou_persistent22              

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Free keywords: Stress-corrosion cracking, Aluminum alloys, Hydrogen embrittlement, Atom probe tomography (APT), Scanning/transmission electron microscopy (STEM)
 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.

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Language(s): eng - English
 Dates: 2023-12
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.scriptamat.2023.115690
 Degree: -

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Title: Scripta Materialia
  Abbreviation : Scripta Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B. V.
Pages: 115690 Volume / Issue: 237 Sequence Number: 115690 Start / End Page: - Identifier: ISSN: 1359-6462
CoNE: https://pure.mpg.de/cone/journals/resource/954926243506