Effect of Annealing of a Pr–Dy–Fe–Co–B Alloy on Its Phase Composition and the Properties of Related Sintered Magnets

The effect of annealing of a (Pr 0.41 Ce 0.12 Dy 0.47 ) 13.46 (Fe 0.64 Co 0.36 ) 80.3 B 6.24 alloy at 1000°C on its microstructure and the properties of sintered magnets made of it has been studied. In the annealed state, the composition of the main magnetic phase (Pr,Dy) 2 (Fe,Co) 14 B changes sharply (dysprosium content changes), the residual induction of the sintered magnets made of the annealed alloy increases by 6%, and the coercive force determined from magnetization increases by 8.5%. The volume content of the main magnetic phase R 2 (Fe,Co) 14 B in sintered magnets (Nb,Dy)–(Fe,Co)–B and (Pr,Dy)–(Fe,Co)–B is found. The content of this phase in neodymium-based magnets is approximately half as much.