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Please use this identifier to cite or link to this item: https://doi.org/10.1007/s11340-008-9208-3
DC FieldValue
dc.titleOn the occurrence of Portevin-Le Chêtelier instabilities in ultrafine-grained 5083 aluminum alloys
dc.contributor.authorJoshi, S.P.
dc.contributor.authorEberl, C.
dc.contributor.authorCao, B.
dc.contributor.authorRamesh, K.T.
dc.contributor.authorHemker, K.J.
dc.date.accessioned2014-06-17T06:29:43Z
dc.date.available2014-06-17T06:29:43Z
dc.date.issued2009
dc.identifier.citationJoshi, S.P., Eberl, C., Cao, B., Ramesh, K.T., Hemker, K.J. (2009). On the occurrence of Portevin-Le Chêtelier instabilities in ultrafine-grained 5083 aluminum alloys. Experimental Mechanics 49 (2) : 207-218. ScholarBank@NUS Repository. https://doi.org/10.1007/s11340-008-9208-3
dc.identifier.issn00144851
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/60991
dc.description.abstractThe Portevin-Le Chêtelier (PLC) instability is commonly observed in Al-Mg alloys and is manifested in serrated flow within the stress-strain response. We investigate the persistence of this instability with reduction in grain size by studying an ultrafine-grained (ufg) aluminum alloy (Al5083) and a conventional grain size Al5083. Micro-scale tensile tests combined with digital image correlation (DIC) reveal strength anisotropy and heterogeneity of the deformation in the three material directions (extrusion, rolled, and transverse). For the same applied displacement rate, the PLC effect in ufg-Al5083 is observed only over a small strain range immediately following the yield, while the coarse-grained Al5083 exhibits serrated flow over nearly the entire plastic strain range. These observations are explained using the stability analysis of Hähner (Acta Mater 45:3695-3707, 1997), and implications for nanocrystalline (nc) alloys are discussed. © Society for Experimental Mechanics 2009.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1007/s11340-008-9208-3
dc.sourceScopus
dc.subjectDIC
dc.subjectGrain size
dc.subjectMicro-tensile testing
dc.subjectPortevin-Le Chêtelier instability
dc.subjectStability analysis
dc.typeArticle
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.doi10.1007/s11340-008-9208-3
dc.description.sourcetitleExperimental Mechanics
dc.description.volume49
dc.description.issue2
dc.description.page207-218
dc.description.codenEXMCA
dc.identifier.isiut000265298000005
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