Reduction of the mechanical anisotropy for hot-deformed Nd-Fe-B magnets by changing the morphology of the melt-spun powders

The effect of the morphology of the melt-spun powders on the compressive and bending strength of hot-deformed Nd-Fe-B magnets has been investigated. The results suggest that the refinement of the melt-spun powders can effectively reduce the mechanical anisotropy of the hot-deformed Nd-Fe-B magnets in two directions parallel and perpendicular to c-axis without sacrificing the magnetic properties. The observation for microstructure shows that the refinement of the melt-spun powders reduced the shape anisotropy of the particles and improved the mechanical properties of the hot-deformed Nd-Fe-B magnets perpendicular to c-axis, thereby improving the mechanical anisotropy of the hot-deformed Nd-Fe-B magnets.