一軸応力下で結晶化させることにより作製したナノ結晶(Fe, Co)-Nb-(Nd, Pr)-Bバルク磁石の磁気特性

概要

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The magnetic properties of nanocrystalline bulk Fe_<100-χ-y>Co_χNb_2(Nd, Pr)_yB_5(χ=0-20, y=5 and 7) alloys produced by consolidating and crystallizing amorphous powders under uniaxial pressure were investigated. The bulk alloy produced by consolidating amorphous Fe_<66>Co_<20>Nb_2Pr_7B_5powder at a temperature (T_5) of 873 K under a uniaxial pressure (P_5) of 636 Mpa had a density of 7.56×10^3kg/m^3 and formed a nanocrystalline composite structure of bcc-(Fe, Co), (Fe, Co)_3B, and Pr_2(Fe, Co)_<14>B phases in the as-consolidated and annealed (973K) states. Nanocrystalline bulk Fe_<100-χ>Co_χNb_2(Nd, Pr)_7B_5(χ=0-20) alloys showed remanence enhancement, associated with an exchange-spring magnet and anisotropic magnetic properties presumably due to the alignment of (Nd, Pr)_2(Fe, Co)_<14>B phase caused by cuystallization under uniaxial pressure. The maximum energy product ((BH)<max>) measured parallel to the press direction was found to be 94kJ/m^3 for Fe_<66>Co_<20>Nb_2Pr_7B_5.
社団法人日本磁気学会の論文
1998-04-15