Abstract
The effect of microstructural variation on magnetic properties of Sm(Co 0.56Fe 0.31Cu 0.04Zr 0.05B 0.04) z ( z = 8 , 10 and 12) melt-spun ribbons was investigated. A high coercivity ( i H c) of 11 kOe was obtained in as-spun ribbons of z = 8 . The ribbon had nanosized grains of ∼10 nm with 1:7H (TbCu 7 type) as a major phase. The ribbon with a high z ( z = 12 ) displayed large grain size (∼50 nm) having 2:17H (Th 2Ni 17 type) as a major phase. Boron enriched precipitates were observed in both z = 8 and 12 ribbons. The boron solubility in the 1:7H phase was more than that in 2:17H phase. The variation of coercivity with z was related to the grain size.
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