Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory Ribbons
In our work, the kinetics of martensitic transformations and the influence of thermal treatments on martensitic transformations, as well as the related magnetic properties of the Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> ferromagnetic shape memory melt-spun ri...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Magnetochemistry |
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| Online Access: | https://www.mdpi.com/2312-7481/9/1/7 |
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| author | Felicia Tolea Bogdan Popescu Cristina Bartha Monica Enculescu Mugurel Tolea Mihaela Sofronie |
| author_facet | Felicia Tolea Bogdan Popescu Cristina Bartha Monica Enculescu Mugurel Tolea Mihaela Sofronie |
| author_sort | Felicia Tolea |
| collection | DOAJ |
| description | In our work, the kinetics of martensitic transformations and the influence of thermal treatments on martensitic transformations, as well as the related magnetic properties of the Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> ferromagnetic shape memory melt-spun ribbons, have been investigated. Thermal treatments at 673 K for 1, 4 and 8 h can be considered an instrument for fine-tuning the performance parameters of alloys. One-hour thermal treatments promote an improvement in the crystallinity of these otherwise highly textured ribbons, reducing internal defects and stress induced by the melt-spinning technique. Longer thermal treatments induce an important magnetization rise concomitantly with a slight and continuous increase in martensitic temperatures and transformation enthalpy. The activation energy, evaluated from differential scanning calorimeter experimental data with a Friedman model, significantly increases after thermal treatments as a result of the multi-phase coexistence and stabilization of the non-modulated martensitic phase, which increases the reverse martensitic transformation hindrance. |
| first_indexed | 2024-03-09T11:53:36Z |
| format | Article |
| id | doaj.art-b27eeba899c4419c9e082e345b1d12bf |
| institution | Directory Open Access Journal |
| issn | 2312-7481 |
| language | English |
| last_indexed | 2024-03-09T11:53:36Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Magnetochemistry |
| spelling | doaj.art-b27eeba899c4419c9e082e345b1d12bf2023-11-30T23:12:21ZengMDPI AGMagnetochemistry2312-74812022-12-0191710.3390/magnetochemistry9010007Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory RibbonsFelicia Tolea0Bogdan Popescu1Cristina Bartha2Monica Enculescu3Mugurel Tolea4Mihaela Sofronie5National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaIn our work, the kinetics of martensitic transformations and the influence of thermal treatments on martensitic transformations, as well as the related magnetic properties of the Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> ferromagnetic shape memory melt-spun ribbons, have been investigated. Thermal treatments at 673 K for 1, 4 and 8 h can be considered an instrument for fine-tuning the performance parameters of alloys. One-hour thermal treatments promote an improvement in the crystallinity of these otherwise highly textured ribbons, reducing internal defects and stress induced by the melt-spinning technique. Longer thermal treatments induce an important magnetization rise concomitantly with a slight and continuous increase in martensitic temperatures and transformation enthalpy. The activation energy, evaluated from differential scanning calorimeter experimental data with a Friedman model, significantly increases after thermal treatments as a result of the multi-phase coexistence and stabilization of the non-modulated martensitic phase, which increases the reverse martensitic transformation hindrance.https://www.mdpi.com/2312-7481/9/1/7kineticsferromagnetic shape memory alloysmelt-spun ribbonsmartensitic transformations |
| spellingShingle | Felicia Tolea Bogdan Popescu Cristina Bartha Monica Enculescu Mugurel Tolea Mihaela Sofronie Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory Ribbons Magnetochemistry kinetics ferromagnetic shape memory alloys melt-spun ribbons martensitic transformations |
| title | Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory Ribbons |
| title_full | Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory Ribbons |
| title_fullStr | Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory Ribbons |
| title_full_unstemmed | Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory Ribbons |
| title_short | Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni<sub>49</sub>Mn<sub>32</sub>Ga<sub>19</sub> Ferromagnetic Shape Memory Ribbons |
| title_sort | kinetics and the effect of thermal treatments on the martensitic transformation and magnetic properties in ni sub 49 sub mn sub 32 sub ga sub 19 sub ferromagnetic shape memory ribbons |
| topic | kinetics ferromagnetic shape memory alloys melt-spun ribbons martensitic transformations |
| url | https://www.mdpi.com/2312-7481/9/1/7 |
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