Phase selection and mechanical properties of permanent-mold cast Mg-Al-Ca-Mn alloys and the role of Ca/Al ratio

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dc.authoridGUNGOR, Ali/0000-0001-7649-4308
dc.authoridIncesu, Alper/0000-0003-4404-4331
dc.contributor.authorElamami, Hamid Ali
dc.contributor.authorIncesu, Alper
dc.contributor.authorKorgiopoulos, Konstantinos
dc.contributor.authorPekguleryuz, Mihriban
dc.contributor.authorGungor, Ali
dc.date.accessioned2024-09-29T15:57:25Z
dc.date.available2024-09-29T15:57:25Z
dc.date.issued2018
dc.departmentKarabük Üniversitesien_US
dc.description.abstractIn this work, phase selection, microstructure and mechanical properties of Mg-Al-Ca-Mn alloys with three different Ca/Al ratios (0.58, 0.79 and 0.91) were studied. The Mn content of the alloys was kept constant at similar to 0.30 wt%. Thermodynamic non-equilibrium (Scheil) simulations, X-Ray Diffraction (XRD) analyses and Scanning Electron Microscopy/Electron Dispersive Spectroscopy (SEM/EDS) determined that all three alloys contain alpha-Mg solid solution phase, Al8Mn5 intermetallics and, depending on the Ca/Al ratio, combinations of C36-(Mg,Al)(2)Ca (hP24 a = 0.577-0.586 nm, c = 1.819-1.835 nm), binary C14-Mg2Ca (hP12, a = 0.620 nm c =1.023 nm), ternary C14-Mg2Ca (hP12, a = 0.561-0.599 nm, c =1.025 -1.051 nm), and/or C15-Al2Ca (cF24, a = 0.793 nm) Laves phases. It is observed that Ca/Al ratio shows a direct relationship with the total amounts of Laves intermetallics and the amount of the C36 phase, and an indirect relationship with the amount of C14 phase. Microhardness measurements, room and elevated temperature (150 degrees C and 200 degrees C) tensile tests, as well as tensile creep tests (175 degrees C/50 MPa), were carried out to determine the mechanical properties of the alloys. Results show that the hardness and room temperature yield and ultimate tensile strengths (UTS) increase while the ductility at all temperatures decreases with increasing Ca/Al ratio. At elevated temperatures, in the range of Ca/Al ratios investigated, the UTS has a relationship with the dissolved amount of Ca and Mn in the alpha-Mg phase. Creep strain was found to decrease from 0.35% to 0.05% as Ca/Al increases from 0.6 to 0.9 and as the amount of the C36 phase which can strengthen grain boundaries increases. One order of magnitude improvement seen in creep resistance as the Ca/Al ratio increases from 0.6 to 0.8 is attributable to the presence of C36 and C14 phases rather than C36 and thermally unstable C15 phase in the alloys and to the increased amounts of dissolved Mn and Ca in the a-Mg matrix. (C) 2018 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipScientific Research Projects Coordination Unit of Karabuk University [KBU-BAP-16/2-DR-099]; NSERC (Natural Sciences and Engineering Research Council) of Canada Discovery granten_US
dc.description.sponsorshipThis work was supported by Scientific Research Projects Coordination Unit of Karabuk University. Project Number: KBU-BAP-16/2-DR-099. Prof. Pekguleryuz acknowledges the financial support of NSERC (Natural Sciences and Engineering Research Council) of Canada Discovery grant and thanks, Pierre Vermette (McGill) and Dr. Amir Farkoosh (Northwestern University, formerly with McGill) for preparing the alloys, casting the samples and for creep testing.en_US
dc.identifier.doi10.1016/j.jallcom.2018.05.309
dc.identifier.endpage225en_US
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-85048271093en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage216en_US
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2018.05.309
dc.identifier.urihttps://hdl.handle.net/20.500.14619/4805
dc.identifier.volume764en_US
dc.identifier.wosWOS:000444058300027en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Science Saen_US
dc.relation.ispartofJournal of Alloys and Compoundsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectMagnesium alloysen_US
dc.subjectMg-Al-Ca-Mn alloysen_US
dc.subjectLaves phasesen_US
dc.subjectCa/Al ratioen_US
dc.subjectCreep and tensile propertiesen_US
dc.titlePhase selection and mechanical properties of permanent-mold cast Mg-Al-Ca-Mn alloys and the role of Ca/Al ratioen_US
dc.typeArticleen_US

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