Abstract
Abstract A series of bonded magnets of (Nd,Pr) 10.5- x Dy x Fe 83.5 B 6 ( x =0.0, 0.5, 1.0, 1.5, 2.0, 2.5) alloys were prepared by a melt-spun method. The effects of Dy substitution on the thermal stability of as-spun ribbons, the magnetic properties and microstructures of alloys were investigated. Dy addition will enhance the intrinsic coercivity H cj greatly, but reduce the remanence B r , because Dy 2 Fe 14 B has a higher magnetocrystalline anisotropy field H A and a lower saturation magnetic polarization J s compared to those of Nd 2 Fe 14 B. The Dy substitution for Nd/Pr enhances the thermal stability and increases the crystallization annealing temperature. The higher annealing temperature leads the fine crystallites existing in as-spun ribbons to easily growing, resulting in appearance of some bigger grains and deterioration of the bonded magnet property. The bonded magnet of (Nd,Pr) 9.5 Dy 1 Fe 83.5 B 6 alloy with 1.0at% Dy has optimal magnetic properties, i.e ( BH ) max =71.6 kJ/m 3 , B r =0.638 T, and H cj = 611 kA/m.
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