| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1799868 | Journal of Magnetism and Magnetic Materials | 2014 | 7 Pages |
•Coercivity enhancement of 19% in Nd–Fe–B magnets without a change in remanence.•Annealing at 600 °C promotes a strong F diffusion along the flake boundaries.•Decomposition of DyF3 and interdiffusion of Dy and Nd during hot-deformation is shown by EDX/WDX.
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.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide
