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dc.contributor.authorRoa Rovira, Joan Josep
dc.contributor.authorJiménez Piqué, Emilio
dc.contributor.authorTarragó Cifre, Jose María
dc.contributor.authorZivcec, Maria
dc.contributor.authorBroeckmann, C.
dc.contributor.authorLlanes Pitarch, Luis Miguel
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.identifier.citationRoa, J.J. [et al.]. Berkovich nanoindentation and deformation mechanisms in a hardmetal binder-like cobalt alloy. "Materials science and engineering A. Structural materials properties microstructure and processing", Novembre 2014, vol. 621, p. 128-132.
dc.description.abstractA cobalt-base solid solution is the most used binder for hardmetals (WC–Co cemented carbides) in a wide range of industrial applications. In the composite material such cobalt alloy is surrounded by hard carbides grains; thus, a direct evaluation of its intrinsic mechanical properties is not an easy task. In order to overcome this inconvenience, a model cobalt alloy with a composition similar to that exhibited by typical hardmetal binder (containing W and C in solid solution) was processed following a powder metallurgy route. Nanoindentation testing at different length scales has been performed to study the mechanical properties as well as to introduce plastic deformation in individual grains of the dilute face centered cubic (fcc) stabilized model Co–W–C alloy. It is found that it exhibits an isotropic mechanical response, without any evidence of indentation size effects. The main deformation mechanism activated during the indentation tests resulted to be deformation twinning, although combined with limited planar slip but with no evidence of stress-induced phase transformation. Such finding is related to the high W and C amounts dissolved in the model Co alloy studied, and its effect on stabilizing the fcc configuration and increasing the stacking fault energy. The effective use of small-length scale mechanical characterization protocols is finally discussed for understanding deformation response of binder-like alloys and optimizing microstructural design of hardmetals.
dc.format.extent5 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials
dc.subject.lcshCobalt alloys
dc.subject.otherHardmetal binder alloy Hardness Elastic modulus Plastic deformation Mechanical twinning
dc.titleBerkovich nanoindentation and deformation mechanisms in a hardmetal binder-like cobalt alloy
dc.subject.lemacCobalt -- Aliatges
dc.contributor.groupUniversitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
upcommons.citation.authorRoa, J.J.; Jimenez-Pique, E.; Tarrago, J.; Zivcec, M.; Broeckmann, C.; Llanes, L.
upcommons.citation.publicationNameMaterials science and engineering A. Structural materials properties microstructure and processing

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