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Diffusion processes in hot-deformed Nd–Fe–B magnets with DyF3 additions

Sawatzki, Simon and Dirba, Imants and Wendrock, Horst and Schultz, Ludwig and Gutfleisch, Oliver (2014):
Diffusion processes in hot-deformed Nd–Fe–B magnets with DyF3 additions.
In: Journal of Magnetism and Magnetic Materials, pp. 163-169, 358-359, ISSN 03048853, [Online-Edition: http://dx.doi.org/10.1016/j.jmmm.2014.01.055],
[Article]

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.

Item Type: Article
Erschienen: 2014
Creators: Sawatzki, Simon and Dirba, Imants and Wendrock, Horst and Schultz, Ludwig and Gutfleisch, Oliver
Title: Diffusion processes in hot-deformed Nd–Fe–B magnets with DyF3 additions
Language: English
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.

Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume: 358-359
Uncontrolled Keywords: Nd–Fe–B, Grain boundary diffusion process (GBDP), DyF3, Hot-deformation, Permanent magnet
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 31 Mar 2014 08:01
Official URL: http://dx.doi.org/10.1016/j.jmmm.2014.01.055
Identification Number: doi:10.1016/j.jmmm.2014.01.055
Funders: 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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