Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys

Detalhes bibliográficos
Autor(a) principal: Oliveira, João Pedro de Sousa
Data de Publicação: 2012
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/8077
Resumo: Dissertação para obtenção do Grau de Mestre em Engenharia de Materiais
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spelling Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloysShape memory alloysNiTiLaser weldingNd:YAGSuperelasticityShape memory effectDissertação para obtenção do Grau de Mestre em Engenharia de MateriaisThe demand of emerging joining techniques for shape memory alloys has become of great importance, as their functional properties, namely shape memory effect and superelasticity, present unique solutions for state-of-the-art applications. Literature shows that significant efforts have been conducted on laser welding of these alloys, although very limited results concerning mechanical properties are reported. In this study, the main objective was to correlate the microstructure of similar NiTi welds with its mechanical behavior. A set of cycling tests was used in order to analyze the superelastic behavior of the welds. Also, shape memory effect was evaluated by means of a bending and free-recovery test. X-ray diffraction analysis allowed to identify the existing phases in the base material, heat affected zone and fusion zone. SEM images of fracture surfaces were also analyzed. It was observed the superelastic behavior of the welds during the mechanical tests. Also shape memory effect was shown to exist on welded samples even after cycling. X-ray diffraction showed a microstructural gradient across the samples. The welding parameters influence the mechanical behavior under cycling of the welds. In particular, there is a specific range of values of heat input introduced during welding that allow obtaining a good mechanical behavior under cycling of the welds.FCT/MCTES - projecto ‘Joining micro to small scale systems in shape memory alloys using last generation infrared lasers’ (PTDC/EMETME/ 100990/2008)Faculdade de Ciências e TecnologiaFernandes, Francisco Manuel BrazMiranda, RosaRUNOliveira, João Pedro de Sousa2012-11-05T10:45:59Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/8077enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T03:40:30Zoai:run.unl.pt:10362/8077Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:17:55.722238Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
title Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
spellingShingle Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
Oliveira, João Pedro de Sousa
Shape memory alloys
NiTi
Laser welding
Nd:YAG
Superelasticity
Shape memory effect
title_short Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
title_full Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
title_fullStr Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
title_full_unstemmed Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
title_sort Correlation between the mechanical cycling behavior and microstructure in laser welded joints using NiTi memory shape alloys
author Oliveira, João Pedro de Sousa
author_facet Oliveira, João Pedro de Sousa
author_role author
dc.contributor.none.fl_str_mv Fernandes, Francisco Manuel Braz
Miranda, Rosa
RUN
dc.contributor.author.fl_str_mv Oliveira, João Pedro de Sousa
dc.subject.por.fl_str_mv Shape memory alloys
NiTi
Laser welding
Nd:YAG
Superelasticity
Shape memory effect
topic Shape memory alloys
NiTi
Laser welding
Nd:YAG
Superelasticity
Shape memory effect
description Dissertação para obtenção do Grau de Mestre em Engenharia de Materiais
publishDate 2012
dc.date.none.fl_str_mv 2012-11-05T10:45:59Z
2012
2012-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/8077
url http://hdl.handle.net/10362/8077
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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