Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change

We have studied the martensitic transformation in a family of Cu-Al-Be crystals: We have measured the entropy change of the transition using a high-sensitivity calorimeter, and the elastic anisotropy of the high-temperature phase as a function of temperature by an ultrasonic method. Both entropy cha...

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Detalles Bibliográficos
Autores: Planes Vila, Antoni, Mañosa, Lluís, Ríos-Jara, David, Ortín, Jordi, 1959-
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1992
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/9770
Acceso en línea:https://hdl.handle.net/2445/9770
Access Level:acceso abierto
Palabra clave:Transformacions martensítiques
Diagrames de fase
Propietats mecàniques
Aliatges
Martensitic transformations
Phase diagrams
Mechanical properties
Alloys
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spelling Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy changePlanes Vila, AntoniMañosa, LluísRíos-Jara, DavidOrtín, Jordi, 1959-Transformacions martensítiquesDiagrames de fasePropietats mecàniquesAliatgesMartensitic transformationsPhase diagramsMechanical propertiesAlloysWe have studied the martensitic transformation in a family of Cu-Al-Be crystals: We have measured the entropy change of the transition using a high-sensitivity calorimeter, and the elastic anisotropy of the high-temperature phase as a function of temperature by an ultrasonic method. Both entropy change and elastic anisotropy at the transition temperature are shown to be independent of the alloy composition. On the other hand, the vibrational entropy change and the elastic anisotropy have been theoreticallay related by an expression containing the fraction of low-energy modes. This relation has been specified for two different situations: (i) The region of soft modes is limited to wave vectors very close to the [ξξ0] direction in the reciprocal space and (ii) the region of soft modes is allowed to spread up to wave vectors with directions differing substantially from [ξξ0]. Our experimental results and other results for other families of Cu-based alloys are consistent with the two relations, suggesting a small (or at least composition independent) electronic contribution to the total entropy change.The American Physical Society1992info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/9770Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.45.7633Physical Review B, 1992, vol. 45, núm. 14, p. 7633-7639.http://dx.doi.org/10.1103/PhysRevB.45.7633(c) The American Physical Society, 1992info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/97702026-05-27T06:46:51Z
dc.title.none.fl_str_mv Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
title Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
spellingShingle Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
Planes Vila, Antoni
Transformacions martensítiques
Diagrames de fase
Propietats mecàniques
Aliatges
Martensitic transformations
Phase diagrams
Mechanical properties
Alloys
title_short Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
title_full Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
title_fullStr Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
title_full_unstemmed Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
title_sort Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
dc.creator.none.fl_str_mv Planes Vila, Antoni
Mañosa, Lluís
Ríos-Jara, David
Ortín, Jordi, 1959-
author Planes Vila, Antoni
author_facet Planes Vila, Antoni
Mañosa, Lluís
Ríos-Jara, David
Ortín, Jordi, 1959-
author_role author
author2 Mañosa, Lluís
Ríos-Jara, David
Ortín, Jordi, 1959-
author2_role author
author
author
dc.subject.none.fl_str_mv Transformacions martensítiques
Diagrames de fase
Propietats mecàniques
Aliatges
Martensitic transformations
Phase diagrams
Mechanical properties
Alloys
topic Transformacions martensítiques
Diagrames de fase
Propietats mecàniques
Aliatges
Martensitic transformations
Phase diagrams
Mechanical properties
Alloys
description We have studied the martensitic transformation in a family of Cu-Al-Be crystals: We have measured the entropy change of the transition using a high-sensitivity calorimeter, and the elastic anisotropy of the high-temperature phase as a function of temperature by an ultrasonic method. Both entropy change and elastic anisotropy at the transition temperature are shown to be independent of the alloy composition. On the other hand, the vibrational entropy change and the elastic anisotropy have been theoreticallay related by an expression containing the fraction of low-energy modes. This relation has been specified for two different situations: (i) The region of soft modes is limited to wave vectors very close to the [ξξ0] direction in the reciprocal space and (ii) the region of soft modes is allowed to spread up to wave vectors with directions differing substantially from [ξξ0]. Our experimental results and other results for other families of Cu-based alloys are consistent with the two relations, suggesting a small (or at least composition independent) electronic contribution to the total entropy change.
publishDate 1992
dc.date.none.fl_str_mv 1992
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/9770
url https://hdl.handle.net/2445/9770
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.45.7633
Physical Review B, 1992, vol. 45, núm. 14, p. 7633-7639.
http://dx.doi.org/10.1103/PhysRevB.45.7633
dc.rights.none.fl_str_mv (c) The American Physical Society, 1992
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The American Physical Society, 1992
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv The American Physical Society
publisher.none.fl_str_mv The American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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