The influence of temperature on hydrogen environmentally assisted cracking of AA7449-T7651 in moist air

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dc.contributor.authorDe Francisco, Unai
dc.contributor.authorLarrosa, Nicolas O.
dc.contributor.authorPeel, Matthew J.
dc.contributor.institutionMATERIALES PARA CONDICIONES EXTREMAS
dc.date.accessioned2024-09-13T10:35:04Z
dc.date.available2024-09-13T10:35:04Z
dc.date.issued2021-03
dc.descriptionPublisher Copyright: © 2020 Elsevier Ltd
dc.description.abstractThe 7xxx series of aluminium alloys are sensitive to intergranular hydrogen environmentally assisted cracking (HEAC) in moist air environments. A new generation of 7xxx alloys used in aircraft components (including AA7449) have been found to be more sensitive to HEAC. This investigation aims to quantify the HEAC crack growth rates of AA7449-T7651 in moist air at different temperatures. Double cantilever beam specimens were loaded at a constant displacement and placed in moist air (80–85% relative humidity) at temperatures between 25 and 80 °C. Regular measurements of crack length permitted the determination of the crack growth rate as a function of the stress intensity factor (KI) during stage I (high KI dependence of growth rate) and stage II (low KI dependence of growth rate). Increasing the temperature was found to increase the crack growth rate during stage II cracking, following Arrhenius kinetics. The activation energy for the stage II crack growth rate at a stress intensity factor of 14.5 MPam was estimated as 84.7 kJ/mol. Additionally, the threshold stress intensity factor for HEAC was found to decrease with increasing temperature. This was attributed to a higher hydrogen solubility at higher temperatures. The crack growth rate of AA7449-T7651 at room temperature was similar to that of overaged AA7050 and AA7075-T7651, ranging between 1.3 and 2.1 × 10−7 mm/s. It was inferred that the alloy temper has more influence than the composition during stage II cracking at room temperature.en
dc.description.sponsorshipI would like to acknowledge the Engineering and Physical Sciences Research Council (EPSRC) for providing funding in a Doctoral Training Partnership (DTP). This funding is provided for a PhD in the University of Bristol (UK). I would also like to acknowledge the support of Alvin Chan and Henry Hall during the experimental design stage. I would like to acknowledge the Engineering and Physical Sciences Research Council (EPSRC) for providing funding in a Doctoral Training Partnership (DTP). This funding is provided for a PhD in the University of Bristol (UK). I would also like to acknowledge the support of Alvin Chan and Henry Hall during the experimental design stage.
dc.description.statusPeer reviewed
dc.identifier.citationDe Francisco , U , Larrosa , N O & Peel , M J 2021 , ' The influence of temperature on hydrogen environmentally assisted cracking of AA7449-T7651 in moist air ' , Corrosion Science , vol. 180 , 109199 . https://doi.org/10.1016/j.corsci.2020.109199
dc.identifier.doi10.1016/j.corsci.2020.109199
dc.identifier.issn0010-938X
dc.identifier.urihttps://hdl.handle.net/11556/5272
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85098053388&partnerID=8YFLogxK
dc.language.isoeng
dc.relation.ispartofCorrosion Science
dc.relation.projectIDEngineering and Physical Sciences Research Council, EPSRC
dc.relation.projectIDUniversity of Bristol
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subject.keywordsAA7449
dc.subject.keywordsAluminium alloys
dc.subject.keywordsDouble cantilever beam
dc.subject.keywordsFracture mechanics
dc.subject.keywordsHydrogen environmentally assisted cracking
dc.subject.keywordsMoist air
dc.subject.keywordsGeneral Chemistry
dc.subject.keywordsGeneral Chemical Engineering
dc.subject.keywordsGeneral Materials Science
dc.titleThe influence of temperature on hydrogen environmentally assisted cracking of AA7449-T7651 in moist airen
dc.typejournal article
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