Maccari, F. ; Aubert, A. ; Ener, S. ; Bruder, E. ; Radulov, I. ; Skokov, K. ; Gutfleisch, O. (2024)
Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering.
In: Journal of Materials Science, 2022, 57 (10)
doi: 10.26083/tuprints-00026607
Artikel, Zweitveröffentlichung, Verlagsversion
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
Mn–Al–C is intended to be one of the ‘‘gap magnets’’ with magnetic performance in-between ferrites and Nd-Fe-B. These magnets are based on the metastable ferromagnetic τ-phase with L1₀ structure, which requires well controlled synthesis to prevent the formation of secondary phases, detrimental for magnetic properties. Here, we investigate the formation of τ-phase in Mn–Al–C using Spark Plasma Sintering (SPS) and compare with conventional annealing. The effect of SPS parameters (pressure and electric current) on the phase formation is also studied. Single τ-phase is obtained for annealing 5 min at 500°C with SPS. In addition, we show that the initial grain size of the τ-phase is influencing the τ-phase transformation and fraction at a given annealing condition, independently of the annealing method used. A faster transformation was observed for smaller initial ϵ-grains. The samples obtained by SPS showed comparable magnetic properties with the conventional annealed ones, reaching coercivity of 0.18 T and saturation magnetization of 114 Am ²/kg in the optimized samples. The similarity in coercivity is related to the microstructure, as we reveal the presence of structure defects like twin boundaries and dislocations in both materials.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Maccari, F. ; Aubert, A. ; Ener, S. ; Bruder, E. ; Radulov, I. ; Skokov, K. ; Gutfleisch, O. |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering |
| Sprache: | Englisch |
| Publikationsjahr: | 10 September 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2022 |
| Ort der Erstveröffentlichung: | Dordrecht [u.a.] |
| Verlag: | Springer Nature |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Science |
| Jahrgang/Volume einer Zeitschrift: | 57 |
| (Heft-)Nummer: | 10 |
| Kollation: | 10 Seiten |
| DOI: | 10.26083/tuprints-00026607 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/26607 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | Mn–Al–C is intended to be one of the ‘‘gap magnets’’ with magnetic performance in-between ferrites and Nd-Fe-B. These magnets are based on the metastable ferromagnetic τ-phase with L1₀ structure, which requires well controlled synthesis to prevent the formation of secondary phases, detrimental for magnetic properties. Here, we investigate the formation of τ-phase in Mn–Al–C using Spark Plasma Sintering (SPS) and compare with conventional annealing. The effect of SPS parameters (pressure and electric current) on the phase formation is also studied. Single τ-phase is obtained for annealing 5 min at 500°C with SPS. In addition, we show that the initial grain size of the τ-phase is influencing the τ-phase transformation and fraction at a given annealing condition, independently of the annealing method used. A faster transformation was observed for smaller initial ϵ-grains. The samples obtained by SPS showed comparable magnetic properties with the conventional annealed ones, reaching coercivity of 0.18 T and saturation magnetization of 114 Am ²/kg in the optimized samples. The similarity in coercivity is related to the microstructure, as we reveal the presence of structure defects like twin boundaries and dislocations in both materials. |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-266071 |
| Zusätzliche Informationen: | This work was funded by the Deutsche Forschungsgemeinschaft DFG (German Research Foundation) under the Priority Programme SPP1959-Fields Matter and European Union’s Horizon 2020 research and innovation programme under grant agreement No 101003914 (PASSENGER). |
| 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 Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physikalische Metallkunde |
| Hinterlegungsdatum: | 10 Sep 2024 07:45 |
| Letzte Änderung: | 11 Sep 2024 08:40 |
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- Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering. (deposited 10 Sep 2024 07:45) [Gegenwärtig angezeigt]
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