Mechanical damping of the snoek peak in tantalum - Oxygen system
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.4028/www.scientific.net/DDF.273-276.239 http://hdl.handle.net/11449/70349 |
Resumo: | Interstitial 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. |
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Mechanical damping of the snoek peak in tantalum - Oxygen systemInternal frictionOxygenTantalumAnelastic relaxation measurementsBody-centered cubic metalsMatrix-interstitial interactionOscillation frequenciesAnnealingConcentration (process)Dislocations (crystals)Relaxation processesSolid solutionsTantalum compoundsCrystal structureInterstitial 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.Departamento de Física UFSCar, C.P. 676, CEP 13.565-905, São Carlos-SPDepartamento de Física UNESP, C.P. 473, CEP 17.033-360, Bauru-SPDepartamento de Engenharia de Materiais UFSCar, CEP 13.565-905, São Carlos-SPDepartamento de Física UNESP, C.P. 473, CEP 17.033-360, Bauru-SPUniversidade Federal de São Carlos (UFSCar)Universidade Estadual Paulista (Unesp)Florêncio, OdilaSilva Jr., Paulo S.Barbosa, Geovani F.Melo, Fábio X.Grandini, Carlos Roberto [UNESP]Ishikawa, Tomaz T.2014-05-27T11:22:49Z2014-05-27T11:22:49Z2008-03-27info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject239-244http://dx.doi.org/10.4028/www.scientific.net/DDF.273-276.239Defect and Diffusion Forum, v. 273-276, p. 239-244.1012-0386http://hdl.handle.net/11449/7034910.4028/www.scientific.net/DDF.273-276.2392-s2.0-4094911330929499838674183380000-0002-3336-309XScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengDefect and Diffusion Forum0,129info:eu-repo/semantics/openAccess2024-04-25T17:40:43Zoai:repositorio.unesp.br:11449/70349Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:35:59.446213Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Mechanical damping of the snoek peak in tantalum - Oxygen system |
title |
Mechanical damping of the snoek peak in tantalum - Oxygen system |
spellingShingle |
Mechanical damping of the snoek peak in tantalum - Oxygen system Florêncio, Odila Internal friction Oxygen Tantalum Anelastic relaxation measurements Body-centered cubic metals Matrix-interstitial interaction Oscillation frequencies Annealing Concentration (process) Dislocations (crystals) Relaxation processes Solid solutions Tantalum compounds Crystal structure |
title_short |
Mechanical damping of the snoek peak in tantalum - Oxygen system |
title_full |
Mechanical damping of the snoek peak in tantalum - Oxygen system |
title_fullStr |
Mechanical damping of the snoek peak in tantalum - Oxygen system |
title_full_unstemmed |
Mechanical damping of the snoek peak in tantalum - Oxygen system |
title_sort |
Mechanical damping of the snoek peak in tantalum - Oxygen system |
author |
Florêncio, Odila |
author_facet |
Florêncio, Odila Silva Jr., Paulo S. Barbosa, Geovani F. Melo, Fábio X. Grandini, Carlos Roberto [UNESP] Ishikawa, Tomaz T. |
author_role |
author |
author2 |
Silva Jr., Paulo S. Barbosa, Geovani F. Melo, Fábio X. Grandini, Carlos Roberto [UNESP] Ishikawa, Tomaz T. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de São Carlos (UFSCar) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Florêncio, Odila Silva Jr., Paulo S. Barbosa, Geovani F. Melo, Fábio X. Grandini, Carlos Roberto [UNESP] Ishikawa, Tomaz T. |
dc.subject.por.fl_str_mv |
Internal friction Oxygen Tantalum Anelastic relaxation measurements Body-centered cubic metals Matrix-interstitial interaction Oscillation frequencies Annealing Concentration (process) Dislocations (crystals) Relaxation processes Solid solutions Tantalum compounds Crystal structure |
topic |
Internal friction Oxygen Tantalum Anelastic relaxation measurements Body-centered cubic metals Matrix-interstitial interaction Oscillation frequencies Annealing Concentration (process) Dislocations (crystals) Relaxation processes Solid solutions Tantalum compounds Crystal structure |
description |
Interstitial 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. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-03-27 2014-05-27T11:22:49Z 2014-05-27T11:22:49Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.4028/www.scientific.net/DDF.273-276.239 Defect and Diffusion Forum, v. 273-276, p. 239-244. 1012-0386 http://hdl.handle.net/11449/70349 10.4028/www.scientific.net/DDF.273-276.239 2-s2.0-40949113309 2949983867418338 0000-0002-3336-309X |
url |
http://dx.doi.org/10.4028/www.scientific.net/DDF.273-276.239 http://hdl.handle.net/11449/70349 |
identifier_str_mv |
Defect and Diffusion Forum, v. 273-276, p. 239-244. 1012-0386 10.4028/www.scientific.net/DDF.273-276.239 2-s2.0-40949113309 2949983867418338 0000-0002-3336-309X |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Defect and Diffusion Forum 0,129 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
239-244 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128833184858112 |