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Título: Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni-Ti alloys
Autor: Moreno-Gobbi, Ariel
Silva, Paulo Sergio Jr.
Nespeque Correa, Diego Rafael
Masó Milá, Alfredo
Muños Chaves, Javier Andrés
Grandini, Carlos Roberto
Santos, Rafael Formenton Macedo dos
Moreira Afonso, Conrado Ramos
Tipo: Artículo
Palabras clave: Ni-Ti alloy, Ultrasonic characterization, Martensitic transformations, Cryogenic temperature, Thermal properties
Fecha de publicación: 2022
Resumen: Ultrasonic velocity and attenuation measurements of a commercially available Ni-rich polycrystalline NieTi 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 NieTi 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 NieTi 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 NieTi 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 NieTi alloy at low temperatures.
Editorial: Elsevier B.V
EN: Journal of Materials Research and Technology, 2022, 18:4940-5004.
Citación: Moreno-Gobbi, A, Silva, P, Nespeque Correa, D, [y otros autores]. "Experimental assessment of low-temperature martensite transformations in Ni-rich polycrystalline Ni-Ti alloys". Journal of Materials Research and Technology. [en línea] 2022, 18:4940-5004. 15 h. DOI: 10.1016/j.jmrt.2022.04.096
ISSN: 22387854
Aparece en las colecciones: Publicaciones académicas y científicas - Facultad de Ciencias

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