Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia

Detalhes bibliográficos
Ano de defesa: 2011
Autor(a) principal: Simões, Thiago Araújo lattes
Orientador(a): Gomes, Rodinei Medeiros lattes
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal da Paraí­ba
Programa de Pós-Graduação: Programa de Pós Graduação em Engenharia Mecânica
Departamento: Engenharia Mecânica
País: BR
Palavras-chave em Português:
Mecanosíntese
Ligas de Fe-Si
Refinamento de Rietveld
Palavras-chave em Inglês:
Mechanical alloying
Fe-Si alloy
Rietveld refinement
Área do conhecimento CNPq:
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/5415
Resumo: This work presents a study about microstructural evolution of nanocrystalline alloys Fe50%Si processed by milling of high energy. With the objective of pondering the process variables, a factorial design 2² with central point was used. The design formed the basis for the development of a semi-empirical model of Fe-Si phase formation, which subsequently led to the response surface equation. The samples were characterized by Xray Fluorescence, Scanning Electron Microscope (SEM), Mössbauer Spectroscopy and Xray diffraction. The structural changes are discussed based on obtained diffractograms and using the Rietveld refinement in the TOPAS software. By calculating the effects of variables, it's shown that for the characteristics of the used system, the milling time has a preponderant effect on the other ones. The study on the evolution of the performed lattice parameter shows the occurrence of two distinct phases with increasing rotation speed and milling time. This evolution demonstrates a transition from disordered to ordered phase of Fe-Si intermetallic compound.
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spelling 2015-05-08T15:00:07Z2018-07-21T00:04:27Z2011-03-152018-07-21T00:04:27Z2011-03-02SIMÕES, Thiago Araújo. STRUCTURAL EVOLUTION OF Fe-Si ALLOYS PROCESSED BY MILLING OF HIGH ENERGY. 2011. 69 f. Dissertação (Mestrado em Engenharia Mecânica) - Universidade Federal da Paraí­ba, João Pessoa, 2011.https://repositorio.ufpb.br/jspui/handle/tede/5415This work presents a study about microstructural evolution of nanocrystalline alloys Fe50%Si processed by milling of high energy. With the objective of pondering the process variables, a factorial design 2² with central point was used. The design formed the basis for the development of a semi-empirical model of Fe-Si phase formation, which subsequently led to the response surface equation. The samples were characterized by Xray Fluorescence, Scanning Electron Microscope (SEM), Mössbauer Spectroscopy and Xray diffraction. The structural changes are discussed based on obtained diffractograms and using the Rietveld refinement in the TOPAS software. By calculating the effects of variables, it's shown that for the characteristics of the used system, the milling time has a preponderant effect on the other ones. The study on the evolution of the performed lattice parameter shows the occurrence of two distinct phases with increasing rotation speed and milling time. This evolution demonstrates a transition from disordered to ordered phase of Fe-Si intermetallic compound.Este trabalho apresenta um estudo sobre a evolução microestrutural de ligas nanocristalinas de Fe50%Si formadas através do processo de moagem de alta energia. Com o objetivo de ponderar sobre as variáveis do processo, um planejamento fatorial 2² com ponto central foi utilizado. O planejamento serviu de base para o desenvolvimento de um modelo semi-empírico de formação da fase Fe-Si que, posteriormente, originou a superfície de resposta da equação. As amostras foram caracterizadas por Fluorescência de Raios-X, Microscopia Eletrônica de Varredura, Espectros de Mössbauer e Difração de Raios-X. As mudanças estruturais são discutidas com base nos difratogramas obtidos e utilizando o refinamento de Rietveld no programa TOPAS. Através do cálculo dos efeitos das variáveis, mostra-se que para as características do sistema utilizado, o tempo de moagem possui um efeito preponderante sobre as demais. O estudo sobre a evolução do parâmetro de rede realizado mostra a ocorrência de duas fases distintas com o incremento da velocidade de rotação e do tempo de moagem. Tal evolução revela a passagem da fase desordenada para ordenada do composto intermetálico Fe-Si.Made available in DSpace on 2015-05-08T15:00:07Z (GMT). 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dc.title.por.fl_str_mv Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
dc.title.alternative.eng.fl_str_mv STRUCTURAL EVOLUTION OF Fe-Si ALLOYS PROCESSED BY MILLING OF HIGH ENERGY
title Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
spellingShingle Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
Simões, Thiago Araújo
Mecanosíntese
Ligas de Fe-Si
Refinamento de Rietveld
Mechanical alloying
Fe-Si alloy
Rietveld refinement
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
title_short Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
title_full Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
title_fullStr Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
title_full_unstemmed Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
title_sort Evolução estrutural de ligas Fe-Si processadas através de moagem de alta energia
author Simões, Thiago Araújo
author_facet Simões, Thiago Araújo
author_role author
dc.contributor.advisor1.fl_str_mv Gomes, Rodinei Medeiros
dc.contributor.advisor1ID.fl_str_mv CPF:60976039915
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/2571715314037365
dc.contributor.authorID.fl_str_mv CPF:04158000483
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/7903824177570749
dc.contributor.author.fl_str_mv Simões, Thiago Araújo
contributor_str_mv Gomes, Rodinei Medeiros
dc.subject.por.fl_str_mv Mecanosíntese
Ligas de Fe-Si
Refinamento de Rietveld
topic Mecanosíntese
Ligas de Fe-Si
Refinamento de Rietveld
Mechanical alloying
Fe-Si alloy
Rietveld refinement
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
dc.subject.eng.fl_str_mv Mechanical alloying
Fe-Si alloy
Rietveld refinement
dc.subject.cnpq.fl_str_mv CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
description This work presents a study about microstructural evolution of nanocrystalline alloys Fe50%Si processed by milling of high energy. With the objective of pondering the process variables, a factorial design 2² with central point was used. The design formed the basis for the development of a semi-empirical model of Fe-Si phase formation, which subsequently led to the response surface equation. The samples were characterized by Xray Fluorescence, Scanning Electron Microscope (SEM), Mössbauer Spectroscopy and Xray diffraction. The structural changes are discussed based on obtained diffractograms and using the Rietveld refinement in the TOPAS software. By calculating the effects of variables, it's shown that for the characteristics of the used system, the milling time has a preponderant effect on the other ones. The study on the evolution of the performed lattice parameter shows the occurrence of two distinct phases with increasing rotation speed and milling time. This evolution demonstrates a transition from disordered to ordered phase of Fe-Si intermetallic compound.
publishDate 2011
dc.date.available.fl_str_mv 2011-03-15
2018-07-21T00:04:27Z
dc.date.issued.fl_str_mv 2011-03-02
dc.date.accessioned.fl_str_mv 2015-05-08T15:00:07Z
2018-07-21T00:04:27Z
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.citation.fl_str_mv SIMÕES, Thiago Araújo. STRUCTURAL EVOLUTION OF Fe-Si ALLOYS PROCESSED BY MILLING OF HIGH ENERGY. 2011. 69 f. Dissertação (Mestrado em Engenharia Mecânica) - Universidade Federal da Paraí­ba, João Pessoa, 2011.
dc.identifier.uri.fl_str_mv https://repositorio.ufpb.br/jspui/handle/tede/5415
identifier_str_mv SIMÕES, Thiago Araújo. STRUCTURAL EVOLUTION OF Fe-Si ALLOYS PROCESSED BY MILLING OF HIGH ENERGY. 2011. 69 f. Dissertação (Mestrado em Engenharia Mecânica) - Universidade Federal da Paraí­ba, João Pessoa, 2011.
url https://repositorio.ufpb.br/jspui/handle/tede/5415
dc.language.iso.fl_str_mv por
language por
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 Universidade Federal da Paraí­ba
dc.publisher.program.fl_str_mv Programa de Pós Graduação em Engenharia Mecânica
dc.publisher.initials.fl_str_mv UFPB
dc.publisher.country.fl_str_mv BR
dc.publisher.department.fl_str_mv Engenharia Mecânica
publisher.none.fl_str_mv Universidade Federal da Paraí­ba
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFPB
instname:Universidade Federal da Paraíba (UFPB)
instacron:UFPB
instname_str Universidade Federal da Paraíba (UFPB)
instacron_str UFPB
institution UFPB
reponame_str Repositório Institucional da UFPB
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