Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloys
Ultrasonic 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...
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| Language: | English |
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Elsevier
2022-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422005968 |
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| author | Ariel Moreno-Gobbi Paulo Sergio Silva, Jr. Diego Rafael Nespeque Correa Alfredo Masó Milá Javier Andrés Muñoz Chaves Carlos Roberto Grandini Rafael Formenton Macedo dos Santos Conrado Ramos Moreira Afonso |
| author_facet | Ariel Moreno-Gobbi Paulo Sergio Silva, Jr. Diego Rafael Nespeque Correa Alfredo Masó Milá Javier Andrés Muñoz Chaves Carlos Roberto Grandini Rafael Formenton Macedo dos Santos Conrado Ramos Moreira Afonso |
| author_sort | Ariel Moreno-Gobbi |
| collection | DOAJ |
| description | Ultrasonic 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. |
| first_indexed | 2024-04-14T04:42:41Z |
| format | Article |
| id | doaj.art-62ed04745f0a4ed3be456a8c057f6e3b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-14T04:42:41Z |
| publishDate | 2022-05-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj.art-62ed04745f0a4ed3be456a8c057f6e3b2022-12-22T02:11:36ZengElsevierJournal of Materials Research and Technology2238-78542022-05-011849905004Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloysAriel Moreno-Gobbi0Paulo Sergio Silva, Jr.1Diego Rafael Nespeque Correa2Alfredo Masó Milá3Javier Andrés Muñoz Chaves4Carlos Roberto Grandini5Rafael Formenton Macedo dos Santos6Conrado Ramos Moreira Afonso7Laboratorio de Acústica Ultrasonora, Instituto de Fisica, Facultad de Ciencias, UdelaR. Iguá 4225, Montevideo, UruguayDepartment of Physics, Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, BrazilIFSP - Federal Institute of Education, Science, and Technology, Grupo de Pesquisa Em Materiais Metálicos Avançados, 18095-410, Sorocaba, SP, Brazil; IBTN/BR - Brazilian Branch Institute of Biomaterials, Tribocorrosion and Nanomedicine, Bauru, SP, 17.033-360, BrazilLaboratorio de Acústica Ultrasonora, Instituto de Fisica, Facultad de Ciencias, UdelaR. Iguá 4225, Montevideo, UruguayGraduate Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil; Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, BrazilLaboratório de Anelasticidade e Biomateriais, UNESP - Universidade Estadual Paulista, Bauru, SP, 17.033-360, Brazil; IBTN/BR - Brazilian Branch Institute of Biomaterials, Tribocorrosion and Nanomedicine, Bauru, SP, 17.033-360, BrazilGraduate Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil; Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, BrazilGraduate Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil; Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil; Corresponding author.Ultrasonic 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.http://www.sciencedirect.com/science/article/pii/S2238785422005968Ni–Ti alloyUltrasonic characterizationMartensitic transformationsCryogenic temperatureThermal properties |
| spellingShingle | Ariel Moreno-Gobbi Paulo Sergio Silva, Jr. Diego Rafael Nespeque Correa Alfredo Masó Milá Javier Andrés Muñoz Chaves Carlos Roberto Grandini Rafael Formenton Macedo dos Santos Conrado Ramos Moreira Afonso Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloys Journal of Materials Research and Technology Ni–Ti alloy Ultrasonic characterization Martensitic transformations Cryogenic temperature Thermal properties |
| title | Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloys |
| title_full | Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloys |
| title_fullStr | Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloys |
| title_full_unstemmed | Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloys |
| title_short | Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni–Ti alloys |
| title_sort | experimental assessment of low temperature martensite transformations in ni rich polycrystalline ni ti alloys |
| topic | Ni–Ti alloy Ultrasonic characterization Martensitic transformations Cryogenic temperature Thermal properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422005968 |
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