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Study on structure and magnetic properties of smco10 alloy prepared by different methods

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Document pages: 10 pages

Abstract: The phase composition, microstructure, atomic structure and magnetic properties of cobalt rich smco10 alloy prepared by arc melting, annealing and melt spinning were studied. The results show that the as cast alloy is composed of th2zn17 type Sm2Co17 matrix, the average grain size is ∼ 45   m, accompanied by lamellar eutectic (composed of α- CO and th2zn17 (composed of Sm2Co17) are distributed at the grain boundary. The phase composition and phase distribution of the annealed alloy are the same as those of the as cast alloy, except that the average grain size is reduced to ∼ 35   m and the eutectic distribution on the matrix is more uniform. Meanwhile, after annealing, the atomic structure of Sm2Co17 did not change, but the degree of structural disorder decreased. The primary ribbon consists of the following parts: ∼ 95.5   Vo. TbCu7-type Sm2Co17 and the rest α-Co. The short rod-shaped α-Co grains are intermittently distributed at the grain boundaries of equiaxed Sm2Co17 grains. The as-spun ribbons show a higher coercivity, and the annealed alloy shows maximum magnetization. The structural parameters were calculated by Extended X-ray Absorption Fine Structure (EXAFS), and the relationship between structure and magnetic properties was discussed in detail.

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