Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys
This paper presents a thermal and microstructural characterization of Cu87-xAl13Nbx (wt%) high temperature shape memory alloys (HTSMA), with Nb contents ranging from 1 to 3%. The alloys were obtained by arc melting under argon atmosphere. Thermal characterization was performed by differential scanni...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2019-11-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000700259&tlng=en |
| _version_ | 1798019882734845952 |
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| author | Jackson de Brito Simões Endira Maria Araújo Pereira José Joelson de Melo Santiago Carlos José de Araújo |
| author_facet | Jackson de Brito Simões Endira Maria Araújo Pereira José Joelson de Melo Santiago Carlos José de Araújo |
| author_sort | Jackson de Brito Simões |
| collection | DOAJ |
| description | This paper presents a thermal and microstructural characterization of Cu87-xAl13Nbx (wt%) high temperature shape memory alloys (HTSMA), with Nb contents ranging from 1 to 3%. The alloys were obtained by arc melting under argon atmosphere. Thermal characterization was performed by differential scanning calorimetry (DSC), revealing that the phase martensitic transformation of all the studied alloys occurs in the range of 200 ºC to 450 ºC. Thermal cycling in this temperature range caused the martensitic transformation to disappear after approximately 6 cycles. However, a new heat treatment at 850 ºC followed by water quenching causes the martensitic transformation to be recovered. Microstructural characterization was performed using optical microscopy (OM) and scanning electron microscopy (SEM), revealing the presence of Nb precipitates in a Cu-Al martensitic matrix, mainly in the Nb-rich compositions. These different microstructures with Nb particles cause a hardness variation that initially decreases between 0.5 %Nb (275HV) and 1.0 %Nb (225HV), then increasing continuously up to 3.0% Nb (380HV). |
| first_indexed | 2024-04-11T16:48:06Z |
| format | Article |
| id | doaj.art-2f7473ccc9604e4f959854442a0c09a1 |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-04-11T16:48:06Z |
| publishDate | 2019-11-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-2f7473ccc9604e4f959854442a0c09a12022-12-22T04:13:30ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392019-11-0122suppl 110.1590/1980-5373-mr-2018-0849Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory AlloysJackson de Brito Simõeshttps://orcid.org/0000-0001-9032-5279Endira Maria Araújo Pereirahttps://orcid.org/0000-0003-2432-1901José Joelson de Melo Santiagohttps://orcid.org/0000-0003-4102-911XCarlos José de Araújohttps://orcid.org/0000-0001-8939-0946This paper presents a thermal and microstructural characterization of Cu87-xAl13Nbx (wt%) high temperature shape memory alloys (HTSMA), with Nb contents ranging from 1 to 3%. The alloys were obtained by arc melting under argon atmosphere. Thermal characterization was performed by differential scanning calorimetry (DSC), revealing that the phase martensitic transformation of all the studied alloys occurs in the range of 200 ºC to 450 ºC. Thermal cycling in this temperature range caused the martensitic transformation to disappear after approximately 6 cycles. However, a new heat treatment at 850 ºC followed by water quenching causes the martensitic transformation to be recovered. Microstructural characterization was performed using optical microscopy (OM) and scanning electron microscopy (SEM), revealing the presence of Nb precipitates in a Cu-Al martensitic matrix, mainly in the Nb-rich compositions. These different microstructures with Nb particles cause a hardness variation that initially decreases between 0.5 %Nb (275HV) and 1.0 %Nb (225HV), then increasing continuously up to 3.0% Nb (380HV).http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000700259&tlng=enCu-Al-Nb alloyshigh-temperature shape memory alloysphase martensitic transformationtemperaturesshape memory alloy |
| spellingShingle | Jackson de Brito Simões Endira Maria Araújo Pereira José Joelson de Melo Santiago Carlos José de Araújo Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys Materials Research Cu-Al-Nb alloys high-temperature shape memory alloys phase martensitic transformation temperatures shape memory alloy |
| title | Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys |
| title_full | Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys |
| title_fullStr | Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys |
| title_full_unstemmed | Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys |
| title_short | Microstructure and Thermal Analyses of Cu87-xAl13Nbx High-Temperature Shape Memory Alloys |
| title_sort | microstructure and thermal analyses of cu87 xal13nbx high temperature shape memory alloys |
| topic | Cu-Al-Nb alloys high-temperature shape memory alloys phase martensitic transformation temperatures shape memory alloy |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000700259&tlng=en |
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