Maccari, Fernando ; Zintler, Alexander ; Brede, Thomas ; Radulov, Iliya A. ; Skokov, Konstantin P. ; Molina-Luna, Leopoldo ; Gutfleisch, Oliver (2023)
Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing.
In: Advanced Engineering Materials, 2023, 25 (18)
doi: 10.26083/tuprints-00024661
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
The ferromagnetic Mn–Al–C τ‐phase (L1₀ tetragonal structure) shows intrinsic potential to be developed as a permanent magnet; however, this phase is metastable and is easily decomposed to nonmagnetic stable phases, affecting negatively the magnetic properties. Giving the necessity to careful control of its synthesis, the use of a novel approach is investigated using electric current–assisted annealing to obtain pure τ‐phase samples. The temperature and electrical resistance of the samples are monitored during annealing and it is shown that the change in resistance can be used to probe the phase transformation. Upon increase of electric current density, the required temperature for the ferromagnetic phase formation is reduced, reaching a maximum shift of 140 °C at 45 A mm⁻². Even though this noticeable shift is achieved, the magnetic properties are not affected showing coercivity of 0.13 T and magnetization of 90 Am² kg⁻¹, independently from the electric current density used during annealing. Microstructural investigation reveals the nucleation of the τ‐phase at the grain boundaries of the parent ε‐phase. In addition, the existence of twin boundaries upon nucleation and growth of the metastable phase for all evaluated annealing conditions is observed, resulting in similar extrinsic magnetic properties.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Maccari, Fernando ; Zintler, Alexander ; Brede, Thomas ; Radulov, Iliya A. ; Skokov, Konstantin P. ; Molina-Luna, Leopoldo ; Gutfleisch, Oliver |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing |
| Sprache: | Englisch |
| Publikationsjahr: | 7 November 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2023 |
| Ort der Erstveröffentlichung: | Weinheim |
| Verlag: | Wiley-VCH |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Advanced Engineering Materials |
| Jahrgang/Volume einer Zeitschrift: | 25 |
| (Heft-)Nummer: | 18 |
| Kollation: | 8 Seiten |
| DOI: | 10.26083/tuprints-00024661 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/24661 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | The ferromagnetic Mn–Al–C τ‐phase (L1₀ tetragonal structure) shows intrinsic potential to be developed as a permanent magnet; however, this phase is metastable and is easily decomposed to nonmagnetic stable phases, affecting negatively the magnetic properties. Giving the necessity to careful control of its synthesis, the use of a novel approach is investigated using electric current–assisted annealing to obtain pure τ‐phase samples. The temperature and electrical resistance of the samples are monitored during annealing and it is shown that the change in resistance can be used to probe the phase transformation. Upon increase of electric current density, the required temperature for the ferromagnetic phase formation is reduced, reaching a maximum shift of 140 °C at 45 A mm⁻². Even though this noticeable shift is achieved, the magnetic properties are not affected showing coercivity of 0.13 T and magnetization of 90 Am² kg⁻¹, independently from the electric current density used during annealing. Microstructural investigation reveals the nucleation of the τ‐phase at the grain boundaries of the parent ε‐phase. In addition, the existence of twin boundaries upon nucleation and growth of the metastable phase for all evaluated annealing conditions is observed, resulting in similar extrinsic magnetic properties. |
| Freie Schlagworte: | electric current–assisted annealing, metastable phase, Mn–Al–C permanent magnets, phase transformation |
| ID-Nummer: | Artikel-ID: 2201805 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-246610 |
| Zusätzliche Informationen: | Special Issue: Manipulation of Matter Controlled by Electric and Magnetic Field: Towards Novel Synthesis and Processing Routes of Inorganic Materials |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Elektronenmikroskopie 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien |
| Hinterlegungsdatum: | 07 Nov 2023 12:49 |
| Letzte Änderung: | 19 Jul 2024 10:27 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Ferromagnetic Mn–Al–C L1₀ Formation by Electric Current Assisted Annealing. (deposited 07 Nov 2023 12:49) [Gegenwärtig angezeigt]
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