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Serrated flow in powder metallurgy Al-5%Mg-1.2%Cr alloy processed by equal channel angular pressing

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dc.affiliation.dptoUC3M. Departamento de Físicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Materiales Nano-Estructurados y Multifuncionaleses
dc.contributor.authorEddahbi, Mohamed Ou Lahcenes
dc.contributor.authorMonge Alcázar, Miguel Ángeles
dc.contributor.authorMuñoz Castellanos, Ángeles
dc.contributor.authorPareja Pareja, Ramiroes
dc.date.accessioned2014-12-05T13:03:01Z
dc.date.available2014-12-05T13:03:01Z
dc.date.issued2012-11
dc.description.abstractThe microstructure, texture and mechanical behavior of the powder metallurgy Al-5 wt.%Mg-1.2 wt.%Cr alloy subjected to equal channel angular pressing (ECAP) has been investigated. The material processed by ECAP, as well as in the homogenized condition, exhibited room temperature serrated flow (SF) up to fracture. The critical stress for the serration onset decreased with increasing strain rate or ECAP temperature. The results indicated that this SF was induced by shear banding. The stress oscillations were attributed to the interaction between shear bands (SBs) and obstacles like second phase particles, and dislocation locks produced by strain hardening. The early stages of the stress-strain sigma-epsilon curves of the ECAP processed samples showed a transition from type B serrations with continuous strain hardening to type B serrations superimposed on a succession of constant stress plateaus when the tensile strain rate was increased from 10⁻4 s⁻1 to 10⁻3 s⁻1. The plateaus in sigma-epsilon curves obtained at a strain rate of 10⁻3 s⁻1 were ascribed to the nucleation of a band at one end of the sample gauge region and subsequent propagation towards the opposite end. At a low strain rate of 10⁻4 s⁻1 the sites for band nucleation should be randomly distributed along the sample gauge region. The disappearance of the plateaus in the sigma-epsilon curves are attributed to the activation of a new moving band before the completion of the deformation banding cycle of the preceding band.en
dc.description.sponsorshipThe experimental work has been carried out at the LMNM (LM 290) laboratory supported by Madrid Community through the project TECHNOFUSION (S2009/ENE 1679) and Spanish Ministry of Science and Innovation (contract ENE2008 06403 C06 04).en
dc.format.extent15
dc.format.mimetypeapplication/pdf
dc.identifier.bibliographicCitationMaterials Characterization, 73 (2012) pp.16-30en
dc.identifier.doi10.1016/j.matchar.2012.06.013
dc.identifier.issn1044-5803
dc.identifier.publicationfirstpage16
dc.identifier.publicationlastpage30
dc.identifier.publicationtitleMaterials characterizationen
dc.identifier.publicationvolume73
dc.identifier.urihttps://hdl.handle.net/10016/19679
dc.identifier.uxxiAR/0000011042
dc.language.isoeng
dc.publisherElsevieres
dc.relation.projectIDComunidad de Madrid. S2009/ENE-1679/TECHNOFUSIONes
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.matchar.2012.06.013
dc.rights© 2012. Elsevier
dc.rights.accessRightsopen access
dc.subject.ecienciaFísicaes
dc.subject.ecienciaMaterialeses
dc.subject.otherAluminum alloysen
dc.subject.otherECAPen
dc.subject.otherSerrated flowen
dc.subject.otherMechanical propertiesen
dc.subject.otherShear bandingen
dc.titleSerrated flow in powder metallurgy Al-5%Mg-1.2%Cr alloy processed by equal channel angular pressingen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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