Sawatzki, Simon ; Dirba, Imants ; Wendrock, Horst ; Schultz, Ludwig ; Gutfleisch, Oliver (2014)
Diffusion processes in hot-deformed Nd–Fe–B magnets with DyF3 additions.
In: Journal of Magnetism and Magnetic Materials, 358-359
doi: 10.1016/j.jmmm.2014.01.055
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Nd–Fe–B melt spun ribbons have been hot-compacted and subsequently die-upset together with DyF3 in order to increase coercivity in nanocrystalline hot-deformed magnets. Magnetic measurements reveal enhanced coercivities for low and reduced coercivities for high Dy-fractions. This behaviour is due to a superposition of the formation of (Dy,Nd)2Fe14B and non-magnetic Dy and Nd fluoride and oxide phases. Energy dispersive and wavelength dispersive X-ray elemental maps verified this feature. Heat treatments at 600 °C induce a strong F diffusion along the flake boundaries without inducing grain growth. This diffusion is correlated with the changes in magnetic properties.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Sawatzki, Simon ; Dirba, Imants ; Wendrock, Horst ; Schultz, Ludwig ; Gutfleisch, Oliver |
| Art des Eintrags: | Bibliographie |
| Titel: | Diffusion processes in hot-deformed Nd–Fe–B magnets with DyF3 additions |
| Sprache: | Englisch |
| Publikationsjahr: | 2014 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Magnetism and Magnetic Materials |
| Jahrgang/Volume einer Zeitschrift: | 358-359 |
| DOI: | 10.1016/j.jmmm.2014.01.055 |
| Kurzbeschreibung (Abstract): | Nd–Fe–B melt spun ribbons have been hot-compacted and subsequently die-upset together with DyF3 in order to increase coercivity in nanocrystalline hot-deformed magnets. Magnetic measurements reveal enhanced coercivities for low and reduced coercivities for high Dy-fractions. This behaviour is due to a superposition of the formation of (Dy,Nd)2Fe14B and non-magnetic Dy and Nd fluoride and oxide phases. Energy dispersive and wavelength dispersive X-ray elemental maps verified this feature. Heat treatments at 600 °C induce a strong F diffusion along the flake boundaries without inducing grain growth. This diffusion is correlated with the changes in magnetic properties. |
| Freie Schlagworte: | Nd–Fe–B, Grain boundary diffusion process (GBDP), DyF3, Hot-deformation, Permanent magnet |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 31 Mär 2014 08:01 |
| Letzte Änderung: | 31 Mär 2014 08:01 |
| PPN: | |
| Sponsoren: | We thank the BMWi (Bundesministerium f. Wirtsch. und Techn.) via IGF (Industrielle Gemeinschaftsforschung) for financial support., We also thank the AiF (Allianz Industrie Forschung) and FVA (Forschungsvereinigung Antriebstechnik e.V.) and the DBU (Deutsche Bundesstiftung Umwelt) for financial support. |
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