Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying

Detalhes bibliográficos
Autor(a) principal: Teixeira, Rodolfo da Silva
Data de Publicação: 2022
Outros Autores: Oliveira, Rebeca Vieira de, Rodrigues, Patricia Freitas, Mascarenhas, João, Neves, Filipe, Paula, Andersan dos Santos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.9/3922
Resumo: ABSTRACT: The present study shows a comparison between two sintering processes, microwave and conventional sintering, for the manufacture of NiTi porous specimens starting from powder mixtures of nickel and titanium hydrogenation-dehydrogenation (HDH) milled by mechanical alloying for a short time (25 min). The samples were sintered at 850 degrees C for 15 min and 120 min, respectively. Both samples exhibited porosity, and the pore size results are within the range of the human bone. The NiTi intermetallic compound (B2, R-phase, and B19 ') was detected in both sintered samples through X-ray diffraction (XRD) and electron backscattering diffraction (EBSD) on scanning electron microscopic (SEM). Two-step phase transformation occurred in both sintering processes with cooling and heating, the latter occurring with an overlap of the peaks, according to the differential scanning calorimetry (DSC) results. From scanning electron microscopy/electron backscatter diffraction, the R-phase and B2/B19 ' were detected in microwave and conventional sintering, respectively. The instrumented ultramicrohardness results show the highest elastic work values for the conventionally sintered sample. It was observed throughout this investigation that using mechanical alloying (MA) powders enabled, in both sintering processes, good results, such as intermetallic formation and densification in the range for biomedical applications.
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spelling Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical AlloyingPowder metallurgyNi-Ti alloysMechanical alloyingMicrowave processingMicrostructuresMechanical propertiesABSTRACT: The present study shows a comparison between two sintering processes, microwave and conventional sintering, for the manufacture of NiTi porous specimens starting from powder mixtures of nickel and titanium hydrogenation-dehydrogenation (HDH) milled by mechanical alloying for a short time (25 min). The samples were sintered at 850 degrees C for 15 min and 120 min, respectively. Both samples exhibited porosity, and the pore size results are within the range of the human bone. The NiTi intermetallic compound (B2, R-phase, and B19 ') was detected in both sintered samples through X-ray diffraction (XRD) and electron backscattering diffraction (EBSD) on scanning electron microscopic (SEM). Two-step phase transformation occurred in both sintering processes with cooling and heating, the latter occurring with an overlap of the peaks, according to the differential scanning calorimetry (DSC) results. From scanning electron microscopy/electron backscatter diffraction, the R-phase and B2/B19 ' were detected in microwave and conventional sintering, respectively. The instrumented ultramicrohardness results show the highest elastic work values for the conventionally sintered sample. It was observed throughout this investigation that using mechanical alloying (MA) powders enabled, in both sintering processes, good results, such as intermetallic formation and densification in the range for biomedical applications.MDPIRepositório do LNEGTeixeira, Rodolfo da SilvaOliveira, Rebeca Vieira deRodrigues, Patricia FreitasMascarenhas, JoãoNeves, FilipePaula, Andersan dos Santos2022-10-21T15:17:04Z2022-082022-08-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/3922engTeixeira, Rodolfo da Silva... [et.al.] - Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying. In: Materials, 2022, vol. 15 (16), article nº 550610.3390/ma151655061996-1944info: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:RCAAP2022-10-23T04:40:07Zoai:repositorio.lneg.pt:10400.9/3922Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:13:54.973601Repositório 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 Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
title Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
spellingShingle Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
Teixeira, Rodolfo da Silva
Powder metallurgy
Ni-Ti alloys
Mechanical alloying
Microwave processing
Microstructures
Mechanical properties
title_short Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
title_full Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
title_fullStr Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
title_full_unstemmed Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
title_sort Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying
author Teixeira, Rodolfo da Silva
author_facet Teixeira, Rodolfo da Silva
Oliveira, Rebeca Vieira de
Rodrigues, Patricia Freitas
Mascarenhas, João
Neves, Filipe
Paula, Andersan dos Santos
author_role author
author2 Oliveira, Rebeca Vieira de
Rodrigues, Patricia Freitas
Mascarenhas, João
Neves, Filipe
Paula, Andersan dos Santos
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório do LNEG
dc.contributor.author.fl_str_mv Teixeira, Rodolfo da Silva
Oliveira, Rebeca Vieira de
Rodrigues, Patricia Freitas
Mascarenhas, João
Neves, Filipe
Paula, Andersan dos Santos
dc.subject.por.fl_str_mv Powder metallurgy
Ni-Ti alloys
Mechanical alloying
Microwave processing
Microstructures
Mechanical properties
topic Powder metallurgy
Ni-Ti alloys
Mechanical alloying
Microwave processing
Microstructures
Mechanical properties
description ABSTRACT: The present study shows a comparison between two sintering processes, microwave and conventional sintering, for the manufacture of NiTi porous specimens starting from powder mixtures of nickel and titanium hydrogenation-dehydrogenation (HDH) milled by mechanical alloying for a short time (25 min). The samples were sintered at 850 degrees C for 15 min and 120 min, respectively. Both samples exhibited porosity, and the pore size results are within the range of the human bone. The NiTi intermetallic compound (B2, R-phase, and B19 ') was detected in both sintered samples through X-ray diffraction (XRD) and electron backscattering diffraction (EBSD) on scanning electron microscopic (SEM). Two-step phase transformation occurred in both sintering processes with cooling and heating, the latter occurring with an overlap of the peaks, according to the differential scanning calorimetry (DSC) results. From scanning electron microscopy/electron backscatter diffraction, the R-phase and B2/B19 ' were detected in microwave and conventional sintering, respectively. The instrumented ultramicrohardness results show the highest elastic work values for the conventionally sintered sample. It was observed throughout this investigation that using mechanical alloying (MA) powders enabled, in both sintering processes, good results, such as intermetallic formation and densification in the range for biomedical applications.
publishDate 2022
dc.date.none.fl_str_mv 2022-10-21T15:17:04Z
2022-08
2022-08-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.9/3922
url http://hdl.handle.net/10400.9/3922
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Teixeira, Rodolfo da Silva... [et.al.] - Microwave versus Conventional Sintering of NiTi Alloys Processed by Mechanical Alloying. In: Materials, 2022, vol. 15 (16), article nº 5506
10.3390/ma15165506
1996-1944
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 MDPI
publisher.none.fl_str_mv MDPI
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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