RAW MATERIAL ALLOY FOR NANOCOMPOSITE MAGNET, RAW MATERIAL ALLOY POWDER FOR THE NANOCOMPOSITE MAGNET, METHOD FOR PREPARING THE RAW MATERIAL ALLOY, METHOD FOR PREPARING THE NANOCOMPOSITE MAGNET POWDER, AND METHOD FOR PRODUCING THE NANOCOMPOSITE MAGNET

摘要

An inventive material alloy for a nanocomposite magnet is represented by a general formula Fe100-x-yRxBy, Fe100-x-y-zRxByCoz, Fe100-x-y-uRxByMu or Fe100-x-y-z-uRxByCozMu. R is a rare-earth element. 90 atomic percent or more of R is Pr and/or Nd, while equal to or larger than 0 atomic percent and less than 10 atomic percent of R is another lanthanoid and/or Y. M is at least one element selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Ni, Cu, Ga, Zr, Nb, Mo, Hf, Ta, W, Pt, Pb, Au and Ag. The molar fractions x, y, z and u meet the inequalities of 2=x=6, 16=y=20, 0.2=z=7 and 0.01=u=7, respectively. The alloy includes a metastable phase Z represented by at least one of a plurality of Bragg reflection peaks observable by X-ray diffraction analysis. The at least one peak corresponds to a lattice spacing of 0.179 nm±0.005 nm. An intensity of the Bragg reflection peak represents 5 to 200 percent, both inclusive, of a maximum intensity of a halo pattern. An intensity of a (110) Bragg reflection peak of body-centered Fe represents less than 5 percent of the maximum intensity of the halo pattern.