Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles
We report on the effects of annealing on the martensitic phase transformation in the Ni-based Heusler system: Mn50Ni40Sn10 and Mn50Ni41Sn9 powder and Co50Ni21Ga32 nanoparticles. For the powdered Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys, structural and magnetic measurements reveal that post-annealing decr...
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| Format: | Article |
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MDPI AG
2015-03-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/5/2/484 |
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| author | Tina Fichtner Changhai Wang Aleksandr A. Levin Guido Kreiner Catalina Salazar Mejia Simone Fabbrici Franca Albertini Claudia Felser |
| author_facet | Tina Fichtner Changhai Wang Aleksandr A. Levin Guido Kreiner Catalina Salazar Mejia Simone Fabbrici Franca Albertini Claudia Felser |
| author_sort | Tina Fichtner |
| collection | DOAJ |
| description | We report on the effects of annealing on the martensitic phase transformation in the Ni-based Heusler system: Mn50Ni40Sn10 and Mn50Ni41Sn9 powder and Co50Ni21Ga32 nanoparticles. For the powdered Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys, structural and magnetic measurements reveal that post-annealing decreases the martensitic transformation temperatures and increases the transition hysteresis. This might be associated with a release of stress in the Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys during the annealing process. However, in the case of Co50Ni21Ga32 nanoparticles, a reverse phenomenon is observed. X-ray diffraction analysis results reveal that the as-prepared Co50Ni21Ga32 nanoparticles do not show a martensitic phase at room temperature. Post-annealing followed by ice quenching, however, is found to trigger the formation of the martensitic phase. The presence of the martensitic transition is attributed to annealing-induced particle growth and the stress introduced during quenching. |
| first_indexed | 2024-12-24T23:00:56Z |
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| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-24T23:00:56Z |
| publishDate | 2015-03-01 |
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| series | Metals |
| spelling | doaj.art-20b13c2360a9486b854d7b19ffe637002022-12-21T16:35:08ZengMDPI AGMetals2075-47012015-03-015248450310.3390/met5020484met5020484Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and NanoparticlesTina Fichtner0Changhai Wang1Aleksandr A. Levin2Guido Kreiner3Catalina Salazar Mejia4Simone Fabbrici5Franca Albertini6Claudia Felser7Max-Planck-Institute for Chemical Physics of Solids (MPI CPFS), Noethnitzer Str. 40, DE-01187 Dresden, GermanyMax-Planck-Institute for Chemical Physics of Solids (MPI CPFS), Noethnitzer Str. 40, DE-01187 Dresden, GermanyMax-Planck-Institute for Chemical Physics of Solids (MPI CPFS), Noethnitzer Str. 40, DE-01187 Dresden, GermanyMax-Planck-Institute for Chemical Physics of Solids (MPI CPFS), Noethnitzer Str. 40, DE-01187 Dresden, GermanyMax-Planck-Institute for Chemical Physics of Solids (MPI CPFS), Noethnitzer Str. 40, DE-01187 Dresden, GermanyInstitute of Materials for Electronics and Magnetism, National Research Council (IMEM-CNR), Parco Area delle Scienze 37/A, I-43124 Parma, ItalyInstitute of Materials for Electronics and Magnetism, National Research Council (IMEM-CNR), Parco Area delle Scienze 37/A, I-43124 Parma, ItalyMax-Planck-Institute for Chemical Physics of Solids (MPI CPFS), Noethnitzer Str. 40, DE-01187 Dresden, GermanyWe report on the effects of annealing on the martensitic phase transformation in the Ni-based Heusler system: Mn50Ni40Sn10 and Mn50Ni41Sn9 powder and Co50Ni21Ga32 nanoparticles. For the powdered Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys, structural and magnetic measurements reveal that post-annealing decreases the martensitic transformation temperatures and increases the transition hysteresis. This might be associated with a release of stress in the Mn50Ni40Sn10 and Mn50Ni41Sn9 alloys during the annealing process. However, in the case of Co50Ni21Ga32 nanoparticles, a reverse phenomenon is observed. X-ray diffraction analysis results reveal that the as-prepared Co50Ni21Ga32 nanoparticles do not show a martensitic phase at room temperature. Post-annealing followed by ice quenching, however, is found to trigger the formation of the martensitic phase. The presence of the martensitic transition is attributed to annealing-induced particle growth and the stress introduced during quenching.http://www.mdpi.com/2075-4701/5/2/484phase transitionsmagnetismX-ray and electron scattering |
| spellingShingle | Tina Fichtner Changhai Wang Aleksandr A. Levin Guido Kreiner Catalina Salazar Mejia Simone Fabbrici Franca Albertini Claudia Felser Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles Metals phase transitions magnetism X-ray and electron scattering |
| title | Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles |
| title_full | Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles |
| title_fullStr | Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles |
| title_full_unstemmed | Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles |
| title_short | Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles |
| title_sort | effects of annealing on the martensitic transformation of ni based ferromagnetic shape memory heusler alloys and nanoparticles |
| topic | phase transitions magnetism X-ray and electron scattering |
| url | http://www.mdpi.com/2075-4701/5/2/484 |
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