Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910812735537152 |
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| author | Martín-Olalla, José-María Vidal-Crespo, Antonio Manchón-Gordón, Alejandro F. Romero, Francisco Javier Blázquez, Javier S. Gallardo, María Carmen Conde, Clara F. |
| author_facet | Martín-Olalla, José-María Vidal-Crespo, Antonio Manchón-Gordón, Alejandro F. Romero, Francisco Javier Blázquez, Javier S. Gallardo, María Carmen Conde, Clara F. |
| contents | We study the thermal properties of a bulk Ni55Fe19Ga26 Heusler alloy in a conduction calorimeter. At slow heating and cooling rates (1K/h), we compare as-cast and annealed samples. We report a smaller thermal hysteresis after the thermal treatment due to the stabilization of the 14M modulated structure in the martensite phase. In ultraslow experiments (40mK/h), we detect and analyze the calorimetric avalanches associated with the direct and reverse martensitic transformation from cubic to 14M phase. This reveals a distribution of events characterized by a power law with exponential cutoff $p(u) \propto u^{-\varepsilon}\exp(-u/ξ)$ where $\varepsilon\sim 2$ and damping energies $ξ=370$uJ (direct) and $ξ=27$uJ (reverse) that characterize the asymmetry of the transformation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_11636 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena Martín-Olalla, José-María Vidal-Crespo, Antonio Manchón-Gordón, Alejandro F. Romero, Francisco Javier Blázquez, Javier S. Gallardo, María Carmen Conde, Clara F. Materials Science We study the thermal properties of a bulk Ni55Fe19Ga26 Heusler alloy in a conduction calorimeter. At slow heating and cooling rates (1K/h), we compare as-cast and annealed samples. We report a smaller thermal hysteresis after the thermal treatment due to the stabilization of the 14M modulated structure in the martensite phase. In ultraslow experiments (40mK/h), we detect and analyze the calorimetric avalanches associated with the direct and reverse martensitic transformation from cubic to 14M phase. This reveals a distribution of events characterized by a power law with exponential cutoff $p(u) \propto u^{-\varepsilon}\exp(-u/ξ)$ where $\varepsilon\sim 2$ and damping energies $ξ=370$uJ (direct) and $ξ=27$uJ (reverse) that characterize the asymmetry of the transformation. |
| title | Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena |
| topic | Materials Science |
| url | https://arxiv.org/abs/2405.11636 |