Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma

Detalhes bibliográficos
Autor(a) principal: Andrade, Breno Henrique da Silva
Data de Publicação: 2018
Tipo de documento: Tese
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/13714
Resumo: In recent years, interest in alloys with low superelasticity shape memory has been increasing. The percentage of stress-induced martensite, not recovered after the release of mechanical loading, has been thermally converted to achieve industrial applications. In this work, the influence of the deformation velocity and the temperature on the residual deformation of Cu-Al-Mn alloys, modified with the addition of Ti-B, capable of the shape memory effect, were evaluated for their use in bonding devices of low processing cost. The alloys were prepared without atmosphere control and were characterized microstructurally via optical microscopy, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction. The thermomechanical properties were evaluated by static tensile and cyclic loading / unloading tests. The results showed that the alloy has a completely austenitic phase at room temperature, presenting a structure of type L21. It was found that martensitic transformation tensions increased with higher loading speeds, as well as residual deformation. The average value of ruptured deformation was approximately 13%. Regarding the variation of the imposed deformation percentage, the superelasticity decreased as the percentage was increased and the residual deformation increased. The results presented indicate the viability of Cu-8.15Al-10.71Mn-0.43Ti-0.086B alloy for applications requiring alloys with high thermal hysteresis.
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spelling Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de formaDeformação residualHistereseSuperelasticidadeManganêsResidual deformationHysteresisSuperelasticityManganeseCNPQ::ENGENHARIAS::ENGENHARIA MECANICAIn recent years, interest in alloys with low superelasticity shape memory has been increasing. The percentage of stress-induced martensite, not recovered after the release of mechanical loading, has been thermally converted to achieve industrial applications. In this work, the influence of the deformation velocity and the temperature on the residual deformation of Cu-Al-Mn alloys, modified with the addition of Ti-B, capable of the shape memory effect, were evaluated for their use in bonding devices of low processing cost. The alloys were prepared without atmosphere control and were characterized microstructurally via optical microscopy, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction. The thermomechanical properties were evaluated by static tensile and cyclic loading / unloading tests. The results showed that the alloy has a completely austenitic phase at room temperature, presenting a structure of type L21. It was found that martensitic transformation tensions increased with higher loading speeds, as well as residual deformation. The average value of ruptured deformation was approximately 13%. Regarding the variation of the imposed deformation percentage, the superelasticity decreased as the percentage was increased and the residual deformation increased. The results presented indicate the viability of Cu-8.15Al-10.71Mn-0.43Ti-0.086B alloy for applications requiring alloys with high thermal hysteresis.NenhumaNos últimos anos, tem sido crescente o interesse pelas ligas com efeito memória de forma de baixa superelasticidade. O percentual de martensita induzida por tensão, não recuperada após a liberação do carregamento mecânico, tem sido convertido termicamente para concretizar aplicações industriais. Neste trabalho, avaliou-se a influência da velocidade de deformação e da temperatura na deformação residual de ligas Cu-Al-Mn, modificadas com a adição de Ti-B, passíveis do efeito memória de forma, visando sua utilização em dispositivos de união de baixo custo de processamento. As ligas foram elaboradas sem controle de atmosfera e caracterizadas microestruturalmente via microscopia óptica, calorimetria diferencial de varredura, microscopia eletrônica de varredura e difração de raios-X. As propriedades termomecânicas foram avaliadas através de ensaios de tração estáticos e cíclicos de carregamento/descarregamento. Os resultados mostraram que a liga possui sua fase totalmente austenítica em temperatura ambiente, apresentando uma estrutura do tipo L21. Verificou-se que as tensões de transformação martensítica aumentaram com velocidades maiores de carregamento, assim como a deformação residual. O valor médio de deformação de ruptura foi de 13% aproximadamente. Com relação à variação do percentual de deformação imposto, a superelasticidade diminuiu conforme aumentou-se o percentual e a deformação residual aumentou. Os resultados apresentados indicam viabilidade da liga Cu-8,15Al-10,71Mn0,43Ti-0,086B para aplicações que exigem ligas com elevada histerese térmica.Universidade Federal da ParaíbaBrasilEngenharia MecânicaPrograma de Pós-Graduação em Engenharia MecânicaUFPBOliveira, Danniel Ferreira dehttp://lattes.cnpq.br/3903255880120747Andrade, Breno Henrique da Silva2019-02-25T14:50:42Z2018-09-132019-02-25T14:50:42Z2018-08-31info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesishttps://repositorio.ufpb.br/jspui/handle/123456789/13714porAttribution-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nd/3.0/br/info:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da UFPBinstname:Universidade Federal da Paraíba (UFPB)instacron:UFPB2019-02-25T14:50:42Zoai:repositorio.ufpb.br:123456789/13714Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufpb.br/PUBhttp://tede.biblioteca.ufpb.br:8080/oai/requestdiretoria@ufpb.br|| diretoria@ufpb.bropendoar:2019-02-25T14:50:42Biblioteca Digital de Teses e Dissertações da UFPB - Universidade Federal da Paraíba (UFPB)false
dc.title.none.fl_str_mv Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
title Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
spellingShingle Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
Andrade, Breno Henrique da Silva
Deformação residual
Histerese
Superelasticidade
Manganês
Residual deformation
Hysteresis
Superelasticity
Manganese
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
title_short Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
title_full Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
title_fullStr Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
title_full_unstemmed Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
title_sort Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
author Andrade, Breno Henrique da Silva
author_facet Andrade, Breno Henrique da Silva
author_role author
dc.contributor.none.fl_str_mv Oliveira, Danniel Ferreira de
http://lattes.cnpq.br/3903255880120747
dc.contributor.author.fl_str_mv Andrade, Breno Henrique da Silva
dc.subject.por.fl_str_mv Deformação residual
Histerese
Superelasticidade
Manganês
Residual deformation
Hysteresis
Superelasticity
Manganese
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
topic Deformação residual
Histerese
Superelasticidade
Manganês
Residual deformation
Hysteresis
Superelasticity
Manganese
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
description In recent years, interest in alloys with low superelasticity shape memory has been increasing. The percentage of stress-induced martensite, not recovered after the release of mechanical loading, has been thermally converted to achieve industrial applications. In this work, the influence of the deformation velocity and the temperature on the residual deformation of Cu-Al-Mn alloys, modified with the addition of Ti-B, capable of the shape memory effect, were evaluated for their use in bonding devices of low processing cost. The alloys were prepared without atmosphere control and were characterized microstructurally via optical microscopy, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction. The thermomechanical properties were evaluated by static tensile and cyclic loading / unloading tests. The results showed that the alloy has a completely austenitic phase at room temperature, presenting a structure of type L21. It was found that martensitic transformation tensions increased with higher loading speeds, as well as residual deformation. The average value of ruptured deformation was approximately 13%. Regarding the variation of the imposed deformation percentage, the superelasticity decreased as the percentage was increased and the residual deformation increased. The results presented indicate the viability of Cu-8.15Al-10.71Mn-0.43Ti-0.086B alloy for applications requiring alloys with high thermal hysteresis.
publishDate 2018
dc.date.none.fl_str_mv 2018-09-13
2018-08-31
2019-02-25T14:50:42Z
2019-02-25T14:50:42Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://repositorio.ufpb.br/jspui/handle/123456789/13714
url https://repositorio.ufpb.br/jspui/handle/123456789/13714
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv Attribution-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nd/3.0/br/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nd/3.0/br/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidade Federal da Paraíba
Brasil
Engenharia Mecânica
Programa de Pós-Graduação em Engenharia Mecânica
UFPB
publisher.none.fl_str_mv Universidade Federal da Paraíba
Brasil
Engenharia Mecânica
Programa de Pós-Graduação em Engenharia Mecânica
UFPB
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações da UFPB
instname:Universidade Federal da Paraíba (UFPB)
instacron:UFPB
instname_str Universidade Federal da Paraíba (UFPB)
instacron_str UFPB
institution UFPB
reponame_str Biblioteca Digital de Teses e Dissertações da UFPB
collection Biblioteca Digital de Teses e Dissertações da UFPB
repository.name.fl_str_mv Biblioteca Digital de Teses e Dissertações da UFPB - Universidade Federal da Paraíba (UFPB)
repository.mail.fl_str_mv diretoria@ufpb.br|| diretoria@ufpb.br
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