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

Resumo

The effect of annealing of a (Pr_0.41Ce_0.12Dy_0.47)_13.46(Fe_0.64Co_0.36)_80.3B_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)₁₄B 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 R₂(Fe,Co)₁₄B 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.