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Hot workability of nanocrystalline AZ91 magnesium alloy

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dc.affiliation.dptoUC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Químicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Tecnología de Polvoses
dc.contributor.authorJabbari Taleghani, Mohammad Ali
dc.contributor.authorTorralba Castelló, José Manueles
dc.date.accessioned2015-04-24T07:47:15Z
dc.date.available2015-04-24T07:47:15Z
dc.date.issued2014-05
dc.description.abstractThis study examined the hot deformation behavior and workability characteristics of nanocrystalline AZ91 Mg alloy by performing hot compression tests with a Gleeble-3800 machine. To this end, a nanocrystalline alloy powder with a crystallite size of 25 nm was synthesized via mechanical milling of a pre-alloyed AZ91 Mg alloy powder for 14 h. The mechanically milled (MM) AZ91 powder was subsequently cold pressed at 600 MPa into cylindrical compacts measuring 10 mm in diameter and 12 mm in height. Then, the powder compacts with a relative green density of 91% were hot-compressed at temperatures ranging from 150 ºC to 500 ºC and at true strain rates ranging from 0.001 s⁻¹ to 10 s⁻¹.The true stress-true strain curves peaked at low strains, after which the flow stress increased moderately. Processing maps were developed for all of the hot compression tests at strains of 0.1, 0.5, and 0.8, which represented a safe deformation domain at deformation temperatures and strain rates in the ranges of 250-350 ºC and 0.1-10 s⁻¹. The crystallite size of the nanocrystalline AZ91 Mg alloy hot-compressed within the aforementioned domain was measured to be 140 nm, which is considered very fine for Mg alloys and resulted in a high hardness value of 133 HV for the hot-compressed alloy.en
dc.description.sponsorshipThe authors would like to thank the Comunidad de Madrid for their financial support of this work through the ESTRUMAT Grant #S2009/MAT-1585.en
dc.format.extent7
dc.format.mimetypeapplication/pdf
dc.identifier.bibliographicCitationJournal of Alloys and Compounds (2014). 595, 1-7.en
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2014.01.091
dc.identifier.issn0925-8388
dc.identifier.publicationfirstpage1
dc.identifier.publicationlastpage7
dc.identifier.publicationtitleJournal of alloys and compoundsen
dc.identifier.publicationvolume595
dc.identifier.urihttps://hdl.handle.net/10016/20479
dc.identifier.uxxiAR/0000014727
dc.language.isoeng
dc.publisherElsevieren
dc.relation.ispartofhttp://hdl.handle.net/10016/20871
dc.relation.projectIDComunidad de Madrid. S2009/MAT-1585/ESTRUMATes
dc.rights© 2014 Elsevier B.V.en
dc.rights.accessRightsopen accessen
dc.subject.ecienciaMaterialeses
dc.subject.otherHot compression testen
dc.subject.otherHot deformation behavioren
dc.subject.otherMechanical millingen
dc.subject.otherNanocrystalline magnesium alloysen
dc.subject.otherProcessing mapen
dc.subject.otherWorkabilityen
dc.titleHot workability of nanocrystalline AZ91 magnesium alloyen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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