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dc.contributor.authorFlorêncio, Odila-
dc.contributor.authorSilva Jr., Paulo S.-
dc.contributor.authorBarbosa, Geovani F.-
dc.contributor.authorMelo, Fábio X.-
dc.contributor.authorGrandini, Carlos Roberto-
dc.contributor.authorIshikawa, Tomaz T.-
dc.identifier.citationDefect and Diffusion Forum, v. 273-276, p. 239-244.-
dc.description.abstractInterstitial solutes in body-centered cubic metals, such as oxygen in tantalum, produce ideally Snoek effects when they are in solutions enough diluted. However, for higher concentration of these solutes, more complex relaxation process can occur, as interaction between interstitial solutes and dislocations. Anelastic relaxation measurements were carried out in polycrystalline tantalum samples, using torsion pendulum inverted, operating between 300 K and 680 K and oscillation frequencies in the hertz bandwidth, for three different experimental sample conditions: as received sample, annealed and annealed followed by a treatment in an oxygen atmosphere. These measurements have revealed the following behavior: the intensity of the internal friction peak associated to matrix-interstitial interaction Ta-O decreased between the first run and the next runs, and this phenomenon did not occur for the others conditions. The variation of relaxation strength of Ta-O peak, with number of runs is due to a decrease of an amount of oxygen in solid solution, which can be associated with the precipitation of new phases in Ta sample and with the trapping of oxygen atoms by dislocations.en
dc.subjectInternal friction-
dc.subjectAnelastic relaxation measurements-
dc.subjectBody-centered cubic metals-
dc.subjectMatrix-interstitial interaction-
dc.subjectOscillation frequencies-
dc.subjectConcentration (process)-
dc.subjectDislocations (crystals)-
dc.subjectRelaxation processes-
dc.subjectSolid solutions-
dc.subjectTantalum compounds-
dc.subjectCrystal structure-
dc.titleMechanical damping of the snoek peak in tantalum - Oxygen systemen
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationDepartamento de Física UFSCar, C.P. 676, CEP 13.565-905, São Carlos-SP-
dc.description.affiliationDepartamento de Física UNESP, C.P. 473, CEP 17.033-360, Bauru-SP-
dc.description.affiliationDepartamento de Engenharia de Materiais UFSCar, CEP 13.565-905, São Carlos-SP-
dc.description.affiliationUnespDepartamento de Física UNESP, C.P. 473, CEP 17.033-360, Bauru-SP-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofDefect and Diffusion Forum-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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