Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente
Autor(a) principal: | |
---|---|
Data de Publicação: | 2015 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/744 |
Resumo: | Glass forming ability (GFA) is one of the big issues to obtain large bulk metallic glasses, which are composed of three or more elements. Regardless of an increasing theoretical understanding of glass formation, taking a look in the vast multidimensional compositional space, the increasing number of elements is concerning. How many? How long will we take searching good-inexpensive compositions for applying in the near-net-shape processing predestined to BMGs? Here, we present the results of Cu36Ti34Zr22Ni8 alloy processed either by melt cooling or milling, which was subsequently hot compacted. After the processing by two routes was verified that the GFA of ribbons was poor and for powders and bulk samples was improved by increasing of 96 K in the crystallization temperature (Tx) After analysis by transmission electron microscopy, corrosion and syncrotron light was observed phase separation in the 3 materials. Phase separation can decrease, that can explain the ribbons behavior. However, after synchrotron data processing, including Reverse Monte Carlo (RMC) simulation was observed a GFA improvement (~10 times greater than in the ribbons) due to an increased interaction between small-large atoms. Evidently this behavior was attributed to differences in the processing. This finding indeed proffers a brand-new viewpoint of the metal's amorphous state, and has implications in the understanding of the structure as being as well a consequence of the processing. This will open a new highway toward the reuse of already developed interesting alloys, which will have the same composition but with a significant improvement in the GFA. |
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Medeiros, Bruno BelliniJorge Júnior, Alberto Moreirahttp://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783774Y2http://lattes.cnpq.br/60455365016217278f846993-591e-475a-937c-1aad25696edf2016-06-02T19:10:30Z2015-05-272016-06-02T19:10:30Z2015-03-31MEDEIROS, Bruno Bellini. Characterization of Cu36Ti34Zr22Ni8 amorphous alloy thermomechanically processed. 2015. 171 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2015.https://repositorio.ufscar.br/handle/ufscar/744Glass forming ability (GFA) is one of the big issues to obtain large bulk metallic glasses, which are composed of three or more elements. Regardless of an increasing theoretical understanding of glass formation, taking a look in the vast multidimensional compositional space, the increasing number of elements is concerning. How many? How long will we take searching good-inexpensive compositions for applying in the near-net-shape processing predestined to BMGs? Here, we present the results of Cu36Ti34Zr22Ni8 alloy processed either by melt cooling or milling, which was subsequently hot compacted. After the processing by two routes was verified that the GFA of ribbons was poor and for powders and bulk samples was improved by increasing of 96 K in the crystallization temperature (Tx) After analysis by transmission electron microscopy, corrosion and syncrotron light was observed phase separation in the 3 materials. Phase separation can decrease, that can explain the ribbons behavior. However, after synchrotron data processing, including Reverse Monte Carlo (RMC) simulation was observed a GFA improvement (~10 times greater than in the ribbons) due to an increased interaction between small-large atoms. Evidently this behavior was attributed to differences in the processing. This finding indeed proffers a brand-new viewpoint of the metal's amorphous state, and has implications in the understanding of the structure as being as well a consequence of the processing. This will open a new highway toward the reuse of already developed interesting alloys, which will have the same composition but with a significant improvement in the GFA.A tendência a formação de estrutura amorfa (TFA) é um dos grandes desafios para se obter metais amorfos de grande volume, os quais são compostos por três ou mais elementos. Independente de uma crescente compreensão teórica da formação do vidro, observando o vasto espaço multicomposicional, o aumento do número de elementos é preocupante. Quantos? Quanto tempo levaremos buscando composições boas e baratas aplicáveis ao processamento via near net shape, predestinado aos metais amorfos de grande volume (MAGV)? Nesta tese de doutorado são apresentados os resultados da liga Cu36Ti34Zr22Ni8 processada por solidificação rápida, moagem e consolidação a quente. Após os dois processamentos se verificou que a TFA das fitas foi pequena e nos pós e amostras consolidadas foi aumentada, através do aumento de 96K na temperatura de cristalização. Após análises via microscopia eletrônica de transmissão, corrosão e luz síncrotron observou-se que houve separação de fases nos 3 tipos de materiais. Separação de fase pode diminuir a TFA, o que explica o comportamento das fitas. Entretanto, após o processamento dos dados do sincrotron, inclusive aplicando simulação de Monte Carlo Reverso (MCR), constatou-se que a melhoria na TFA (que foi de aproximadamente 10 vezes maior que na fita) foi devido a um aumento na interação entre átomos pequenos e grandes. Evidentemente este comportamento foi atribuído a diferenças entre os processamentos. Esta descoberta, de fato, profere um novo ponto de vista ao estado amorfo do metal, e tem implicações na compreensão da estrutura como sendo também uma consequência do processamento. Isto abrirá um novo caminho em direção ao reaproveitamento de ligas já desenvolvidas e interessantes, que terão a mesma composição, mas com uma melhoria significativa na TFA.Financiadora de Estudos e Projetosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRMetalurgiaMetais amorfosConsolidação a quenteRadiação sincrotrônicaENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICACaracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamenteCharacterization of Cu36Ti34Zr22Ni8 amorphous alloy thermomechanically processedinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis-1-12b508166-b635-4fb0-a91b-419736667f7finfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL6810.pdfapplication/pdf5030553https://repositorio.ufscar.br/bitstream/ufscar/744/1/6810.pdf9c7b90aa2e0826e986d57009336f6e6fMD51TEXT6810.pdf.txt6810.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/744/2/6810.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL6810.pdf.jpg6810.pdf.jpgIM Thumbnailimage/jpeg6386https://repositorio.ufscar.br/bitstream/ufscar/744/3/6810.pdf.jpge19189b571ddadb9a4355f56b19610e1MD53ufscar/7442023-09-18 18:31:27.982oai:repositorio.ufscar.br:ufscar/744Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:27Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente |
dc.title.alternative.eng.fl_str_mv |
Characterization of Cu36Ti34Zr22Ni8 amorphous alloy thermomechanically processed |
title |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente |
spellingShingle |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente Medeiros, Bruno Bellini Metalurgia Metais amorfos Consolidação a quente Radiação sincrotrônica ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente |
title_full |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente |
title_fullStr |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente |
title_full_unstemmed |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente |
title_sort |
Caracterização da liga amorfa Cu36Ti34Zr22Ni8 processada termomecanicamente |
author |
Medeiros, Bruno Bellini |
author_facet |
Medeiros, Bruno Bellini |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/6045536501621727 |
dc.contributor.author.fl_str_mv |
Medeiros, Bruno Bellini |
dc.contributor.advisor1.fl_str_mv |
Jorge Júnior, Alberto Moreira |
dc.contributor.advisor1Lattes.fl_str_mv |
http://genos.cnpq.br:12010/dwlattes/owa/prc_imp_cv_int?f_cod=K4783774Y2 |
dc.contributor.authorID.fl_str_mv |
8f846993-591e-475a-937c-1aad25696edf |
contributor_str_mv |
Jorge Júnior, Alberto Moreira |
dc.subject.por.fl_str_mv |
Metalurgia Metais amorfos Consolidação a quente Radiação sincrotrônica |
topic |
Metalurgia Metais amorfos Consolidação a quente Radiação sincrotrônica ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
Glass forming ability (GFA) is one of the big issues to obtain large bulk metallic glasses, which are composed of three or more elements. Regardless of an increasing theoretical understanding of glass formation, taking a look in the vast multidimensional compositional space, the increasing number of elements is concerning. How many? How long will we take searching good-inexpensive compositions for applying in the near-net-shape processing predestined to BMGs? Here, we present the results of Cu36Ti34Zr22Ni8 alloy processed either by melt cooling or milling, which was subsequently hot compacted. After the processing by two routes was verified that the GFA of ribbons was poor and for powders and bulk samples was improved by increasing of 96 K in the crystallization temperature (Tx) After analysis by transmission electron microscopy, corrosion and syncrotron light was observed phase separation in the 3 materials. Phase separation can decrease, that can explain the ribbons behavior. However, after synchrotron data processing, including Reverse Monte Carlo (RMC) simulation was observed a GFA improvement (~10 times greater than in the ribbons) due to an increased interaction between small-large atoms. Evidently this behavior was attributed to differences in the processing. This finding indeed proffers a brand-new viewpoint of the metal's amorphous state, and has implications in the understanding of the structure as being as well a consequence of the processing. This will open a new highway toward the reuse of already developed interesting alloys, which will have the same composition but with a significant improvement in the GFA. |
publishDate |
2015 |
dc.date.available.fl_str_mv |
2015-05-27 2016-06-02T19:10:30Z |
dc.date.issued.fl_str_mv |
2015-03-31 |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:10:30Z |
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.citation.fl_str_mv |
MEDEIROS, Bruno Bellini. Characterization of Cu36Ti34Zr22Ni8 amorphous alloy thermomechanically processed. 2015. 171 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2015. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/744 |
identifier_str_mv |
MEDEIROS, Bruno Bellini. Characterization of Cu36Ti34Zr22Ni8 amorphous alloy thermomechanically processed. 2015. 171 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2015. |
url |
https://repositorio.ufscar.br/handle/ufscar/744 |
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por |
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por |
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2b508166-b635-4fb0-a91b-419736667f7f |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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