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

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Show simple item record Eddahbi, Mohamed Ou Lahcen Monge Alcázar, Miguel Ángel Muñoz Castellanos, Ángel Pareja Pareja, Ramiro 2014-12-05T13:03:01Z 2014-12-05T13:03:01Z 2012-11
dc.identifier.bibliographicCitation Materials Characterization, 73 (2012) pp.16-30
dc.identifier.issn 1044-5803
dc.description.abstract The 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.
dc.description.sponsorship The 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).
dc.format.extent 15
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights © 2012. Elsevier
dc.subject.other Aluminum alloys
dc.subject.other ECAP
dc.subject.other Serrated flow
dc.subject.other Mechanical properties
dc.subject.other Shear banding
dc.title Serrated flow in powder metallurgy Al-5%Mg-1.2%Cr alloy processed by equal channel angular pressing
dc.type article
dc.subject.eciencia Física
dc.subject.eciencia Materiales
dc.identifier.doi 10.1016/j.matchar.2012.06.013
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. S2009/ENE-1679/TECHNOFUSION
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 16
dc.identifier.publicationlastpage 30
dc.identifier.publicationtitle Materials characterization
dc.identifier.publicationvolume 73
dc.identifier.uxxi AR/0000011042
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