Abstract
Sm-Fe alloys with compositions of SmFe10 and SmFe9.5Ti0.5 were prepared by rapid solidification processing. The as-quenched and annealed specimens did not show sufficiently high coercivity for use as permanent magnets, but the coercivity was improved by subsequent nitrogenation of the specimens. The specimens exhibited the maximum coercivity when nitrogenated at 743 K for 20 h in this study. The optimally nitrogenated SmFe10 specimen consisted of the TbCu7-type and α-Fe phases and showed a coercivity of 10.1 kOe, whereas the optimally nitrogenated SmFe9.5Ti0.5 specimen consisted of the Th2Zn17-type phase without the α-Fe phase and exhibited a high coercivity of 17.0 kOe.
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