Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni-Ti alloys

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorFacultad de Ciencias-
Autor(es): dc.contributorUniversidade Federal de São Carlos (UFSCar)-
Autor(es): dc.contributorGrupo de Pesquisa em Materiais Metálicos Avançados-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorTribocorrosion and Nanomedicine-
Autor(es): dc.creatorMoreno-Gobbi, Ariel-
Autor(es): dc.creatorSilva, Paulo Sergio-
Autor(es): dc.creatorNespeque Correa, Diego Rafael-
Autor(es): dc.creatorMilá, Alfredo Masó-
Autor(es): dc.creatorMuñoz Chaves, Javier Andrés-
Autor(es): dc.creatorGrandini, Carlos Roberto-
Autor(es): dc.creatorMacedo Dos Santos, Rafael Formenton-
Autor(es): dc.creatorMoreira Afonso, Conrado Ramos-
Data de aceite: dc.date.accessioned2025-08-21T19:48:55Z-
Data de disponibilização: dc.date.available2025-08-21T19:48:55Z-
Data de envio: dc.date.issued2023-03-02-
Data de envio: dc.date.issued2023-03-02-
Data de envio: dc.date.issued2022-05-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jmrt.2022.04.096-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/242134-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/242134-
Descrição: dc.descriptionUltrasonic velocity and attenuation measurements of a commercially available Ni-rich polycrystalline Ni-Ti alloy were simultaneously obtained upon cooling from room temperature (RT) down to 130 K. The anelastic spectra show multiple anomalies in both velocity and attenuation curves, which evidence a complex nature of structural rearrangements exhibited by Ni-Ti alloy, associated with relaxations and phase transformations. In particular, some evident anomalies at 285 and 180 K, not previously exploited using ultrasonic measurements on Ni-rich polycrystalline Ni-Ti alloy, were associated with austenite to pre-martensitic (B2 → R) and pre-martensitic to martensitic (R → B19') phase transitions, respectively. The peculiar temperature separation between these transformations was interpreted based on chemical composition and the Ni-Ti alloy microstructure evolution. X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) were also used to add complementary results about phase transformations and thermal events exhibited by Ni-Ti alloy at low temperatures. XRD, Rietveld refinement, SEM and transmission electron microscopy (TEM) analyses confirm the coexistence of the austenite B2, martensite B19', and Ni4Ti3 phases at RT. DSC measurements indicated reversible two-stage martensitic transitions involving B2 → R → B19' phase transformations at similar temperatures than the observed from ultrasonic anomalies. Besides that, several anelastic relaxation events identified around the phase transitions reveal the occurrence of complex physical mechanisms, such as accommodation of the twinned R-phase and martensite domain walls, twinning boundaries mobility, and the coupling between stress-induced dislocation motion and interstitial diffusion, not reported simultaneously in the literature. The ferroelastic nature of martensite and pre-martensite phase transformations was confirmed for a commercially available Ni-rich polycrystalline Ni-Ti alloy studied in this work.-
Descrição: dc.descriptionLaboratorio de Acústica Ultrasonora Instituto de Fisica Facultad de Ciencias, UdelaR. Iguá-
Descrição: dc.descriptionDepartment of Physics Federal University of São Carlos (UFSCar), SP-
Descrição: dc.descriptionIFSP - Federal Institute of Education Science and Technology Grupo de Pesquisa em Materiais Metálicos Avançados, SP-
Descrição: dc.descriptionGraduate Program in Materials Science and Engineering (PPG-CEM) Federal University of São Carlos (UFSCar), SP-
Descrição: dc.descriptionDepartment of Materials Engineering (DEMa) Federal University of São Carlos (UFSCar), SP-
Descrição: dc.descriptionLaboratório de Anelasticidade e Biomateriais UNESP - Universidade Estadual Paulista, SP-
Descrição: dc.descriptionIBTN/BR - Brazilian Branch Institute of Biomaterials Tribocorrosion and Nanomedicine, SP-
Descrição: dc.descriptionLaboratório de Anelasticidade e Biomateriais UNESP - Universidade Estadual Paulista, SP-
Formato: dc.format4990-5004-
Idioma: dc.languageen-
Relação: dc.relationJournal of Materials Research and Technology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectCryogenic temperature-
Palavras-chave: dc.subjectMartensitic transformations-
Palavras-chave: dc.subjectNi-Ti alloy-
Palavras-chave: dc.subjectThermal properties-
Palavras-chave: dc.subjectUltrasonic characterization-
Título: dc.titleExperimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni-Ti alloys-
Tipo de arquivo: dc.typelivro digital-
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