Abstract
Abstract SmCo 5− x Fe x ( x = 0–4) alloys were produced by melt-spinning and subsequent annealing. It was found that the small substitution of Fe for Co in the SmCo 5 alloy results in the formation of the Sm(Co,Fe) 5 phase, but that the large substitution of Fe for Co results in the formation of other phases such as the Sm(Co,Fe) 7 and Sm 2 (Co,Fe) 7 phases. The remanence of the annealed SmCo 5− x Fe x melt-spun ribbons increased from x = 0 to x = 3 then decreased with increasing Fe content, while their coercivity decreased as the Fe content increased. Transmission electron microscope (TEM) studies revealed that the annealed SmCo 4 Fe melt-spun ribbon consisted of relatively coarse Sm(Co,Fe) 5 grains, whereas the annealed SmCo 2 Fe 3 melt-spun ribbon consisted of a mixture of extremely fine grains of the Sm(Co,Fe) 7 and Fe phases. The annealed SmCo 4 Fe alloy with the Sm(Co,Fe) 5 phase showed a high coercivity of 10.2 kOe with a remanence of 60 emu/g, while the annealed SmCo 2 Fe 3 alloy formed a nanocomposite magnet with a high remanence of 100 emu/g and a coercivity of 2.9 kOe.
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