Effect of equal-channel angular pressing on microstructure, aging kinetics and impact behavior in a 7075 aluminum alloy

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dc.contributor.authorElibol, Cagatay
dc.contributor.authorSagir, Kadir
dc.contributor.authorDogan, Mert
dc.date.accessioned2025-02-20T08:42:18Z
dc.date.available2025-02-20T08:42:18Z
dc.date.issued2024
dc.departmentTürk-Alman Üniversitesien_US
dc.description.abstractAmong the precipitation hardenable 7xxx series aluminum alloys, AA7075 alloys (one of the most important engineering alloys) due to their low density (lightweight), high toughness and strength, and enhanced fatigue behavior have been used over the years in aerospace, aircraft, automotive, construction and marine applications. In the present study, the influence of the artificial aging through conventional heat treatment (i.e., precipitation hardening) and the thermomechanical treatment (equal-channel angular pressing (ECAP) + post-ECAP aging) on the quasi-static tensile, impact toughness and precipitation behavior as well as on the microstructure of an AA7075 alloy is investigated systematically. The results indicate that the ECAP process as well as post-ECAP aging result in considerably increased strength and hardness of the AA7075 alloys because of the superimposed effects of grain boundary strengthening (Hall-Petch relation), strain hardening (by means of the increased dislocation density) and precipitation hardening (due to the fine precipitates formed in Al matrix). Multi-pass ECAP processing has been found to result in a considerable decrease of the impact toughness (from 15.3 Jcm(-2) to 7.6 Jcm(-2)) associated with the failure mode (i.e., ductile-to-brittle transition) of the AA7075 alloys, whereas the artificial peak aging leads to a marked improvement (similar to 67 %) in the impact toughness in ECAPed conditions. Moreover, the ECAP process noticeably accelerates the precipitation kinetics of AA7075 alloys: The peak aging time in the ECAPed alloy is reduced significantly - from 30 h to 4 h. The results of the present study provide a deeper understanding of the combination of ECAP and heat treatment, and their effect on the fracture mode and toughness under impact loading, the aging kinetics and the microstructural evolution of an AA7075 alloy.
dc.description.sponsorshipTurkish Aerospace; Scientific and Technological Research Council of Turkiye (TUBITAK)
dc.description.sponsorshipThis work was supported by the Turkish Aerospace; and the Scientific and Technological Research Council of Turkiye (TUBITAK) .
dc.identifier.doi10.1016/j.mtcomm.2024.108931
dc.identifier.issn2352-4928
dc.identifier.scopus2-s2.0-85190779947
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1016/j.mtcomm.2024.108931
dc.identifier.urihttps://hdl.handle.net/20.500.12846/1639
dc.identifier.volume39en_US
dc.identifier.wosWOS:001300082300001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofMaterials Today Communications
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250220
dc.subjectSevere plastic deformation (SPD)en_US
dc.subjectEqual-channel angular pressing (ECAP)en_US
dc.subjectAluminum alloysen_US
dc.subjectImpact toughnessen_US
dc.subjectGrain refinementen_US
dc.subjectPrecipitation hardeningen_US
dc.subjectAging kineticsen_US
dc.titleEffect of equal-channel angular pressing on microstructure, aging kinetics and impact behavior in a 7075 aluminum alloy
dc.typeArticle

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