Phase transformations in metastable $β$ Zr15Nb alloy revealed by in-situ methods
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912704475693056 |
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| author | Veverková, Anna Bartha, Kristína Veselý, Jozef Barriobero-Vila, Pere Kozlík, Jiří Doležal, Petr Pospíšil, Jiří Šmilauerová, Jana Stráský, Josef |
| author_facet | Veverková, Anna Bartha, Kristína Veselý, Jozef Barriobero-Vila, Pere Kozlík, Jiří Doležal, Petr Pospíšil, Jiří Šmilauerová, Jana Stráský, Josef |
| contents | 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) $β$ phases - $β_{Zr}$ and $β_{Nb}$ - with closely related lattice parameters are identified. At room temperature, the microstructure is characterized by a mixture of the metastable $β_{Zr}$ + $ω_{ath}$ phase. Upon heating, $β_{Zr}$ progressively decomposes, giving rise to the formation of $β_{Nb}$. TEM observation revealed the cuboidal shape of the $ω_{iso}$ particles resulting from the high lattice misfit between $β$ and $ω$ phase. The $ω$ 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 $α$ phase occurs after the dissolution of the $ω$ phase, resulting in a pronounced increase in thermal expansion. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_09236 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase transformations in metastable $β$ Zr15Nb alloy revealed by in-situ methods Veverková, Anna Bartha, Kristína Veselý, Jozef Barriobero-Vila, Pere Kozlík, Jiří Doležal, Petr Pospíšil, Jiří Šmilauerová, Jana Stráský, Josef Materials Science 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) $β$ phases - $β_{Zr}$ and $β_{Nb}$ - with closely related lattice parameters are identified. At room temperature, the microstructure is characterized by a mixture of the metastable $β_{Zr}$ + $ω_{ath}$ phase. Upon heating, $β_{Zr}$ progressively decomposes, giving rise to the formation of $β_{Nb}$. TEM observation revealed the cuboidal shape of the $ω_{iso}$ particles resulting from the high lattice misfit between $β$ and $ω$ phase. The $ω$ 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 $α$ phase occurs after the dissolution of the $ω$ phase, resulting in a pronounced increase in thermal expansion. |
| title | Phase transformations in metastable $β$ Zr15Nb alloy revealed by in-situ methods |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.09236 |