Maccari, Fernando ; Aubert, Alex ; Ener, Semih ; Bruder, Enrico ; Radulov, Iliya ; Skokov, Konstantin P. ; Gutfleisch, Oliver (2022)
Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering.
In: Journal of Materials Science, 57 (10)
doi: 10.1007/s10853-022-07002-4
Artikel, Bibliographie
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 ϵ-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 Am2/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: | 2022 |
| Autor(en): | Maccari, Fernando ; Aubert, Alex ; Ener, Semih ; Bruder, Enrico ; Radulov, Iliya ; Skokov, Konstantin P. ; Gutfleisch, Oliver |
| Art des Eintrags: | Bibliographie |
| Titel: | Formation of pure τ-phase in Mn–Al–C by fast annealing using spark plasma sintering |
| Sprache: | Englisch |
| Publikationsjahr: | 5 März 2022 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Science |
| Jahrgang/Volume einer Zeitschrift: | 57 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1007/s10853-022-07002-4 |
| 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 ϵ-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 Am2/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. |
| 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: | 09 Aug 2022 09:20 |
| Letzte Änderung: | 06 Okt 2022 08:28 |
| PPN: | 498051110 |
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