It has previously been reported that annealing of amorphous Sm5Fe17 melt-spun ribbon resulted in the formation of the Sm5Fe17 phase and the resultant Sm5Fe17 melt-spun ribbon exhibited a high coercivity. However, the annealing condition of the amorphous Sm5Fe17 melt-spun ribbon was somewhat critical and it was not easy to obtain Sm5Fe17 grains with high coercivity. In the present study, it was found that the small substitution of Ti for Fe in the Sm5Fe17 melt-spun ribbon stabilized the Sm5Fe17 phase. Annealed Sm5Fe16.7Ti0.3 melt-spun ribbon consisted of small and homogeneous Sm5(Fe,Ti)17 grains and exhibited a higher coercivity than the annealed Sm5Fe17 melt-spun ribbon.
The magnetic properties and structures of (Sm,Zr) 5 (Fe,Co) 17¹x Ti x (x = 02.0) melt-spun ribbons were investigated in the as-quenched condition and after annealing. The as-quenched (Sm,Zr) 5 (Fe,Co) 17¹x Ti x (x = 00.5) specimens consisted of the Sm 5 Fe 17-type and SmFe 3-type phases, while the as-quenched (Sm,Zr) 5 (Fe,Co) 17¹x Ti x (x = 1.02.0) specimens contained the SmFe 3-type phase. These specimens showed low coercivity regardless of the Ti content. Heat treatment of the melt-spun ribbons resulted in a drastic increase in coercivity. The maximum coercivity of 1.11 MAm ¹1 was achieved in the (Sm,Zr) 5 (Fe,Co) 15.5 Ti 1.5 specimen annealed at 1073 K. Microstructural studies revealed that the annealed specimen consisted mainly of the SmFe 3-type phase. The achieved high coercivity of the annealed specimen was therefore attributed to the existence of the SmFe 3-type phase.
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