| 摘要 |
PROBLEM TO BE SOLVED: To provide a raw alloy for manufacture of a rare earth magnetic powder. SOLUTION: When the symbol R refers hereinafter to at least one kind among rare earth elements including Y, the symbol T refers hereinafter to Fe or a component which is composed essentially of Fe and in which part of Fe is substituted by Co or Ni, the symbol M refers hereinafter to B or a component in which part of B is substituted by C, and the symbol A refers hereinafter to at least one element among Al, Ga, Si, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W, this raw alloy has a structure in which a phase (hereinafter referred to as an internal dispersed phase), constituted so that a g-phase having a crystal structure capable of being in a coherent relation with an MR hydride consisting of an M-containing R hydride is dispersed in the inner part of a phase of the above MR hydride having 0.002-20 μm average grain size, is dispersed integrally with a rim-like phase which surrounds the above internal dispersed phase and a part or the whole of which has an R2 T14 M-type tetragonal structure in the matrix of an R-T-M-A alloy composed essentially of R, T, M and A into island state. |
