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Gibbs-Thomson effect as driving force for liquid film migration: Converting metallic into ceramic fibers through intrinsic oxidation

2021-10Journal article Open access
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dc.contributor.authorDias, Marta
dc.contributor.authorRosinski, M.
dc.contributor.authorRodrigues, P. C. R.
dc.contributor.authorCorreia, J.B.
dc.contributor.authorCarvalho, Patricia Almeida
dc.date.accessioned2021-12-17T17:34:19Z
dc.date.available2021-12-17T17:34:19Z
dc.date.issued2021-10
dc.description.abstractABSTRACT: Liquid film migration is of great practical importance in materials engineering. The phenomenon has been shown to depend on thermal gradients and coherency strain, but no single driving mechanism seems capable of justifying the whole array of experimental observations. On the other hand, the inevitable capillarity effects are often disregarded due to the unknown 3-dimensional geometry of the system. Here, we present evidence of liquid film migration governed primarily by capillarity through a microstructural setup of cylindrical interfaces that allows clear interpretation and modeling. The experiments rely on the strong oxygen-gettering ability of tantalum fibers dispersed in a tungsten matrix and on field-enhanced diffusivity provided by pulse plasma compaction. Tantalum scavenges the residual oxygen present in the W powder and, as a result, oxide films grow around the fibers. These oxide tubes, in liquid state during sintering, migrate toward the fiber axis and eventually become oxide rods surrounded by metallic Ta. The process is driven by the Gibbs-Thomson effect that generates the required composition gradient across the liquid film. An analytical description of the film evolution is implemented by combining the incoming O flux with capillarity-driven migration. Possible contributions from other mechanisms are examined and the relevance of the Gibbs-Thomson effect to the general phenomenon of liquid film migration is established.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationDias, M... [et.al.] - Gibbs-Thomson effect as driving force for liquid film migration: Converting metallic into ceramic fibers through intrinsic oxidation. In: Acta Materialia, 2021, Vol. 218, article nº 117216pt_PT
dc.identifier.doi10.1016/j.actamat.2021.117216pt_PT
dc.identifier.eissn1873-2453
dc.identifier.issn1359-6454
dc.identifier.urihttp://hdl.handle.net/10400.9/3638
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.relationIRRADIATION STUDIES OF TUNGSTEN BASED MATERIALS FOR FUSION APPLICATIONS
dc.relation.publisherversionhttps://doi.org/10.1016/j.actamat.2021.117216pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMaterialspt_PT
dc.subjectLiquid film migrationpt_PT
dc.subjectOxide filmpt_PT
dc.subjectKineticspt_PT
dc.subjectMechanical propertiespt_PT
dc.titleGibbs-Thomson effect as driving force for liquid film migration: Converting metallic into ceramic fibers through intrinsic oxidationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardTitleIRRADIATION STUDIES OF TUNGSTEN BASED MATERIALS FOR FUSION APPLICATIONS
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2019/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F68663%2F2010/PT
oaire.citation.titleActa Materialiapt_PT
oaire.citation.volume218pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameDias
person.familyNameCorreia
person.familyNamecarvalho
person.givenNameMarta
person.givenNameJose B.
person.givenNamepatricia
person.identifier.ciencia-id0E13-5F70-9D8A
person.identifier.ciencia-idC31C-D617-6377
person.identifier.ciencia-id021E-97A3-F128
person.identifier.orcid0000-0001-6797-7711
person.identifier.orcid0000-0002-8314-0695
person.identifier.orcid0000-0002-5447-0409
person.identifier.ridC-1150-2009
person.identifier.scopus-author-id7202364148
person.identifier.scopus-author-id7102859165
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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