Hot workability of nanocrystalline AZ91 magnesium alloy

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dc.contributor.author Jabbari Taleghani, Mohammad Ali
dc.contributor.author Torralba Castelló, José Manuel
dc.date.accessioned 2015-04-24T07:47:15Z
dc.date.available 2015-04-24T07:47:15Z
dc.date.issued 2014-05
dc.identifier.bibliographicCitation Journal of Alloys and Compounds (2014). 595, 1-7.
dc.identifier.issn 0925-8388
dc.identifier.uri http://hdl.handle.net/10016/20479
dc.description.abstract This 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.
dc.description.sponsorship The authors would like to thank the Comunidad de Madrid for their financial support of this work through the ESTRUMAT Grant #S2009/MAT-1585.
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartof http://hdl.handle.net/10016/20871
dc.rights © 2014 Elsevier B.V.
dc.subject.other Hot compression test
dc.subject.other Hot deformation behavior
dc.subject.other Mechanical milling
dc.subject.other Nanocrystalline magnesium alloys
dc.subject.other Processing map
dc.subject.other Workability
dc.title Hot workability of nanocrystalline AZ91 magnesium alloy
dc.type article
dc.subject.eciencia Materiales
dc.identifier.doi https://doi.org/10.1016/j.jallcom.2014.01.091
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. S2009/MAT-1585/ESTRUMAT
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1
dc.identifier.publicationlastpage 7
dc.identifier.publicationtitle Journal of alloys and compounds
dc.identifier.publicationvolume 595
dc.identifier.uxxi AR/0000014727
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