Estudo da histerese térmica de ligas Cu-Al-Mn-Ti-B com efeito memória de forma
Autor(a) principal: | |
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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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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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1801842945314258944 |