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dc.contributor.authorFourmeau, Marion
dc.contributor.authorMarioara, Calin Daniel
dc.contributor.authorBørvik, Tore
dc.contributor.authorBenallal, Ahmed
dc.contributor.authorHopperstad, Odd Sture
dc.date.accessioned2017-12-18T09:05:42Z
dc.date.available2017-12-18T09:05:42Z
dc.date.created2015-11-26T08:31:35Z
dc.date.issued2015
dc.identifier.citationPhilosophical Magazine. 2015, 95 (28-30), 3278-3304.nb_NO
dc.identifier.issn1478-6435
dc.identifier.urihttp://hdl.handle.net/11250/2472295
dc.description.abstractAge-hardened aluminium alloys have various degrees of precipitate-free zones (PFZs) along grain boundaries (GBs). The PFZs are weak zones and their existence promotes combined transgranular and intergranular fracture, thus reducing the ductility of the alloy. In this study, transmission electron microscopy (TEM) is used to display the geometrical properties and the chemical composition of the PFZs in the AA7075-T651 aluminium alloy. PFZs are found along grain and sub-GBs and their widths are about 40 and 20 nm, respectively. The PFZs are depleted of alloying elements compared with the nominal composition due to GB precipitation, but still they contain a certain amount of such elements in solid solution which will contribute to increase the yield strength and the work hardening compared to pure aluminium. Based on the results from the TEM study, a micromechanical finite element model of an idealized microstructure including grains and soft zones along the GBs is established. The Gurson model was used to represent the behaviour of the material in the grains and in the soft zones, using different initial void volume fractions to account for GB precipitation. Several loading conditions were applied to the micromechanical model in order to evaluate the localization of strains inside the soft zones and thus to get a better understanding of the role of the PFZs in ductile fracture of age-hardened aluminium alloys. It was found that the global failure strain varies non-monotonically with the global stress triaxiality due to the heterogeneity of the idealized microstructure.nb_NO
dc.language.isoengnb_NO
dc.publisherTaylor & Francisnb_NO
dc.titleA study of the influence of precipitate free zones on the strain localization and failure of the aluminium alloy AA7075-T651nb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionsubmittedVersionnb_NO
dc.source.pagenumber3278-3304nb_NO
dc.source.volume95nb_NO
dc.source.journalPhilosophical Magazinenb_NO
dc.source.issue28-30nb_NO
dc.identifier.doi10.1080/14786435.2015.1040099
dc.identifier.cristin1293455
dc.relation.projectNorges forskningsråd: 237885nb_NO
dc.description.localcodeThis is an Accepted Manuscript of an article published by Taylor & Francis in Philosophical Magazine on 13 May 2015, available online: http://www.tandfonline.com/10.1080/14786435.2015.1040099nb_NO
cristin.unitcode194,64,45,0
cristin.unitnameInstitutt for konstruksjonsteknikk
cristin.ispublishedtrue
cristin.fulltextpreprint
cristin.qualitycode1


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