Phase transformations in metastable ß-Zr15Nb alloy revealed by in situ methods
This study examines the phase transitions occurring during linear heating of the Zr15Nb alloy through a comprehensive, multi-technique methodology comprising in situ high-energy synchrotron X-ray diffraction (HEXRD), electrical resistance measurements, differential scanning calorimetry (DSC) and the...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/449676 |
| Acceso en línea: | https://hdl.handle.net/2117/449676 https://dx.doi.org/10.1007/s10853-025-11846-x |
| Access Level: | acceso abierto |
| Palabra clave: | Zr-Nb alloys In situ high-energy synchrotron X-ray diffraction (HEXRD) Electrical resistance measurements Differential scanning calorimetry (DSC) Thermal expansion analysis Transmission electron microscopy (TEM) Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | This study examines the phase transitions occurring during linear heating of the Zr15Nb alloy through a comprehensive, multi-technique methodology comprising in situ high-energy synchrotron X-ray diffraction (HEXRD), electrical resistance measurements, differential scanning calorimetry (DSC) and thermal expansion analysis, supplemented by ex situ transmission electron microscopy (TEM). The findings reveal a complex sequence of phase transformations and corresponding structural changes over a broad temperature range (from room temperature up to 800 °C). Two distinct body-centered cubic (bcc) ß phases ßZr and ßNbwith closely related lattice parameters are identified. At room temperature, the microstructure is characterized by a mixture of the metastable ßZr¿+¿¿ath phase. Upon heating, ßZr progressively decomposes, giving rise to the formation of ßNb. TEM observation revealed the cuboidal shape of the ¿iso particles, resulting from the high lattice misfit between ß and ¿ phase. The ¿ solvus temperature is determined to be approximately 555 °C, as evidenced by in situ HEXRD and abrupt changes in the alloy’s thermal and electrical properties. The growth of the a phase occurs after the dissolution of the ¿ phase, resulting in a pronounced increase in thermal expansion. |
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