Investigation of Magnetic Anisotropy for α-Fe/Nd_2Fe_<14>B Composition Alloy as Exchange-Spring Magnets Prepared Using Hot-Upsetting Technique

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A hot-upsetting process was applied to rapidly quenched starting ribbon powders having Nd_<10>Fe_<80>Co_5B_5 alloy composition of the α-Fe/Nd_2Fe_<14>B system, with the aim of obtaining anisotropic exchange-spring magnets. Specimens fabricated at upsetting temperatures up to 950℃ displayed isotropic magnetic properties, but anisotropic magnetic properties were manifested at 1000℃ or higher. Specimens that exhibited anisotropy showed magnetic properties on the order of Br = 0.3 T and H_<cJ>= 30 kA/m and consisted of a soft α-Fe magnetic phase and a hard Nd_2Fe_<14>B magnetic phase. Hard-phase crystals showed equiaxial morphology and reached a grain size of approximately 1 μm. We observed from XRD patterns that the easy-magnetization axis of the hard-phase crystals tended to be oriented parallel to the direction of applied upsetting pressure.
社団法人日本磁気学会の論文
2004-05-01