Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/11800 |
Resumo: | Grain refinement is an important hardening mechanism in metallic alloys, notably when the grain size reaches the submicrometer scale. For this purpose, several techniques of Severe Plastic Deformation (SPD) have been employed, among which is the Equal-channel Angular Pressing (ECAP). However, the relation between grain size and corrosion resistance remains a controversial subject for most metallic materials. The aim of the present work is to evaluate the microstructure, the mechanical strength and the stress corrosion cracking (SCC) resistance of two ulfrafine grained aluminum alloys, AA1050 and Al-4%Cu, severely deformed by ECAP. Microstructure was analyzed by optical microscopy (OM), scanning (SEM) and transmission (TEM) electron microscopy, while the mechanical strength was evaluated through conventional hardness and tensile tests. Constant load and slow strain rate (SSR) tensile tests were carried out in an aqueous solution containing 3.5wt% of NaCl, in order to evaluate the SCC resistance of the alloys. After ECAP, OM and MEV revealed a significant grain size reduction in both alloys, with a fragmentation and redistribution of coarse second phase particles in the case of Al-4%Cu alloy. Hardness and tensile tests indicated a remarkable increase in the mechanical strength of the processed materials. In SSR tensile tests, with a relatively short time of exposure to the NaCl environment, CST was detected only in the Al-4% Cu alloy. In constant load tests, fractures occurred at stress levels lower than the yield stress, indicating CST susceptibility for long exposure times, in both alloys. In the absence of Cu particles (AA1050), no significant effects of ECAP processing were observed on the response to CST tests. In the case of Al-4% Cu alloy, it was found that the presence, as well as size and distribution, of the second phase particles affects the CST resistance, and that these factors can be modified, and possibly controlled, by means of ECAP processing. |
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Braga, Diogo PedrinoSordi, Vitor Luizhttp://lattes.cnpq.br/8364164402481940Della Rovere, Carlos Albertohttp://lattes.cnpq.br/8141224513975606http://lattes.cnpq.br/84077116103864336e0c5184-393a-4ef7-88aa-e5f9e4902e642019-09-09T13:51:24Z2019-09-09T13:51:24Z2019-04-29BRAGA, Diogo Pedrino. Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular. 2019. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11800.https://repositorio.ufscar.br/handle/ufscar/11800Grain refinement is an important hardening mechanism in metallic alloys, notably when the grain size reaches the submicrometer scale. For this purpose, several techniques of Severe Plastic Deformation (SPD) have been employed, among which is the Equal-channel Angular Pressing (ECAP). However, the relation between grain size and corrosion resistance remains a controversial subject for most metallic materials. The aim of the present work is to evaluate the microstructure, the mechanical strength and the stress corrosion cracking (SCC) resistance of two ulfrafine grained aluminum alloys, AA1050 and Al-4%Cu, severely deformed by ECAP. Microstructure was analyzed by optical microscopy (OM), scanning (SEM) and transmission (TEM) electron microscopy, while the mechanical strength was evaluated through conventional hardness and tensile tests. Constant load and slow strain rate (SSR) tensile tests were carried out in an aqueous solution containing 3.5wt% of NaCl, in order to evaluate the SCC resistance of the alloys. After ECAP, OM and MEV revealed a significant grain size reduction in both alloys, with a fragmentation and redistribution of coarse second phase particles in the case of Al-4%Cu alloy. Hardness and tensile tests indicated a remarkable increase in the mechanical strength of the processed materials. In SSR tensile tests, with a relatively short time of exposure to the NaCl environment, CST was detected only in the Al-4% Cu alloy. In constant load tests, fractures occurred at stress levels lower than the yield stress, indicating CST susceptibility for long exposure times, in both alloys. In the absence of Cu particles (AA1050), no significant effects of ECAP processing were observed on the response to CST tests. In the case of Al-4% Cu alloy, it was found that the presence, as well as size and distribution, of the second phase particles affects the CST resistance, and that these factors can be modified, and possibly controlled, by means of ECAP processing.O refino de grãos é um importante mecanismo de endurecimento de ligas metálicas, especialmente quando estes são reduzidos a escalas sub micrométricas. Um dos caminhos já consolidados para esse refino são as técnicas de deformação plástica severa (DPS), dentre as quais está o processamento por extrusão em canal angular (ECA). A relação entre o tamanho de grão e a resistência à corrosão de um material, no entanto, é um assunto ainda controverso. Esse trabalho tem como objetivo analisar a microestrutura, o comportamento mecânico e a resistência à corrosão sob tensão (CST) das ligas de alumínio AA1050 e Al-4%Cu com granulação ultrafina obtida por ECA. As mudanças microestruturais foram avaliadas por técnicas de microscopia óptica (MO), eletrônica de varredura (MEV) e de transmissão (MET) e as propriedades mecânicas por ensaios de tração e dureza. A resistência à CST foi avaliada por ensaios de tração em baixa taxa de deformação (BTD) e em carga constante (CC), em solução aquosa com 3,5% em peso de NaCl. Com o processamento até 8 passes de ECA houve drástica redução no tamanho médio dos grãos até valores abaixo de 1 μm e, no caso da liga Al-4%Cu, fragmentação e reorientação das partículas grosseiras de Cu, presentes na condição inicial. Os ensaios de tração e de dureza indicaram grande aumento na resistência mecânica dos materiais processados. Nos ensaios de tração em BTD, com tempos relativamente curtos de exposição ao meio, a CST foi detectada apenas na liga de Al-4%Cu. Nos ensaios em CC ocorreram fraturas abaixo do limite de escoamento em ambas ligas, indicando suscetibilidade a CST em longos tempo de exposição. Na liga AA1050 não foram observados efeitos significativos do processamento ECA na resposta aos ensaios de CST. Na liga Al-4%Cu verificou-se que a presença, assim como o tamanho e a distribuição, das partículas de segunda fase de Cu afeta sensivelmente a resistência à CST, sendo que esses fatores podem ser modificados, e eventualmente controlados, por meio do processamento ECA.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)CAPES: Código de Financiamento 001porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarLigas de alumínioDeformação plástica severa - DPSExtrusão em canal angular - ECACorrosão sob tensão – CSTAluminum alloysSevere plastic deformation SPDEqual channel angular extrusion – ECAPStress corrosion cracking – SCCENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAMicroestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angularMicrostructure, mechanical strength and stress corrosion in Al-0.3% Fe and Al-4% Cu aluminum alloys processed by angular channel extrusioninfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOnline6006003ecbc8ef-0ebd-4b04-9d94-9ea2a68cf81finfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALDiogo Pedrino Braga - Dissertação.pdfDiogo Pedrino Braga - Dissertação.pdfDissertaçãoapplication/pdf13795995https://repositorio.ufscar.br/bitstream/ufscar/11800/1/Diogo%20Pedrino%20Braga%20-%20Disserta%c3%a7%c3%a3o.pdf33b3a026514459a66a191da677d6acfcMD51BCO - Carta Comprovante Autoarquivamento.pdfBCO - Carta Comprovante Autoarquivamento.pdfCarta comprovanteapplication/pdf551145https://repositorio.ufscar.br/bitstream/ufscar/11800/2/BCO%20-%20Carta%20Comprovante%20Autoarquivamento.pdfeec922817b4189f990458979c66f78b3MD52LICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular |
dc.title.alternative.eng.fl_str_mv |
Microstructure, mechanical strength and stress corrosion in Al-0.3% Fe and Al-4% Cu aluminum alloys processed by angular channel extrusion |
title |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular |
spellingShingle |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular Braga, Diogo Pedrino Ligas de alumínio Deformação plástica severa - DPS Extrusão em canal angular - ECA Corrosão sob tensão – CST Aluminum alloys Severe plastic deformation SPD Equal channel angular extrusion – ECAP Stress corrosion cracking – SCC ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular |
title_full |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular |
title_fullStr |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular |
title_full_unstemmed |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular |
title_sort |
Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular |
author |
Braga, Diogo Pedrino |
author_facet |
Braga, Diogo Pedrino |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/8407711610386433 |
dc.contributor.author.fl_str_mv |
Braga, Diogo Pedrino |
dc.contributor.advisor1.fl_str_mv |
Sordi, Vitor Luiz |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/8364164402481940 |
dc.contributor.advisor-co1.fl_str_mv |
Della Rovere, Carlos Alberto |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/8141224513975606 |
dc.contributor.authorID.fl_str_mv |
6e0c5184-393a-4ef7-88aa-e5f9e4902e64 |
contributor_str_mv |
Sordi, Vitor Luiz Della Rovere, Carlos Alberto |
dc.subject.por.fl_str_mv |
Ligas de alumínio Deformação plástica severa - DPS Extrusão em canal angular - ECA Corrosão sob tensão – CST |
topic |
Ligas de alumínio Deformação plástica severa - DPS Extrusão em canal angular - ECA Corrosão sob tensão – CST Aluminum alloys Severe plastic deformation SPD Equal channel angular extrusion – ECAP Stress corrosion cracking – SCC ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.eng.fl_str_mv |
Aluminum alloys Severe plastic deformation SPD Equal channel angular extrusion – ECAP Stress corrosion cracking – SCC |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
Grain refinement is an important hardening mechanism in metallic alloys, notably when the grain size reaches the submicrometer scale. For this purpose, several techniques of Severe Plastic Deformation (SPD) have been employed, among which is the Equal-channel Angular Pressing (ECAP). However, the relation between grain size and corrosion resistance remains a controversial subject for most metallic materials. The aim of the present work is to evaluate the microstructure, the mechanical strength and the stress corrosion cracking (SCC) resistance of two ulfrafine grained aluminum alloys, AA1050 and Al-4%Cu, severely deformed by ECAP. Microstructure was analyzed by optical microscopy (OM), scanning (SEM) and transmission (TEM) electron microscopy, while the mechanical strength was evaluated through conventional hardness and tensile tests. Constant load and slow strain rate (SSR) tensile tests were carried out in an aqueous solution containing 3.5wt% of NaCl, in order to evaluate the SCC resistance of the alloys. After ECAP, OM and MEV revealed a significant grain size reduction in both alloys, with a fragmentation and redistribution of coarse second phase particles in the case of Al-4%Cu alloy. Hardness and tensile tests indicated a remarkable increase in the mechanical strength of the processed materials. In SSR tensile tests, with a relatively short time of exposure to the NaCl environment, CST was detected only in the Al-4% Cu alloy. In constant load tests, fractures occurred at stress levels lower than the yield stress, indicating CST susceptibility for long exposure times, in both alloys. In the absence of Cu particles (AA1050), no significant effects of ECAP processing were observed on the response to CST tests. In the case of Al-4% Cu alloy, it was found that the presence, as well as size and distribution, of the second phase particles affects the CST resistance, and that these factors can be modified, and possibly controlled, by means of ECAP processing. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-09-09T13:51:24Z |
dc.date.available.fl_str_mv |
2019-09-09T13:51:24Z |
dc.date.issued.fl_str_mv |
2019-04-29 |
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 |
BRAGA, Diogo Pedrino. Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular. 2019. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11800. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/11800 |
identifier_str_mv |
BRAGA, Diogo Pedrino. Microestrutura, resistência mecânica e corrosão sob tensão em ligas de alumínio Al-0,3%Fe e Al-4%Cu processadas por extrusão em canal angular. 2019. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11800. |
url |
https://repositorio.ufscar.br/handle/ufscar/11800 |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
dc.publisher.initials.fl_str_mv |
UFSCar |
publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.source.none.fl_str_mv |
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