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No.4(pp.111-156)

Home > Issues > Volume 3 (1998) > No.4(pp.111-156)

A Study on the Magnetic Properties of Melt-Spun (Fe, T)-Nd-C Alloys (T=Al, Ti, Co, Ni)

Journal of Magnetics, Volume 3, Number 4, 31 Dec 1998, Pages 116-119

T. S. Jang(Division of Metallurgical and Materials Engineering, Sun Moon University), D. H. Cho(Dept. of Metallurgical Engineering, Han Yang University)

Abstract

Influence of small additions (≤2.0 at.%) of Al, Ti, Co, and Ni on the microstructural development and the magnetic properties of melt-spun Fe-Bd-C alloys was investigated. Addition of these elements tended to stabilize the crystallization of as-spun ribbons. Especially, Al and Ti preferred to stabilize Fe₁₇Nd₂C_x. The average grain size of Fe₁₇Nd₂C (0.1~0.3 µm), obtained by a proper annealing, in the ribbon treated with 0.5 at.% additive was much smaller than that of additive-free ribbons, which would be the major source of large increase in coercivity. Among the additives, Ni was very effective to increase the coercivity whereas Co had beneficial effect on T_c. By adding 0.5 at.% Ni, intrinsic coercivities of more than 1.4 T, 40~50% higher than that (~1.0 T) of additive-free ribbons, can be obtained after annealing at 750~800℃.

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