αFe/NdFeB系ナノコンポジット合金の磁気特性と微細構造

概要

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The microstructure of remaining amorphous-phase αFe/NdFeB nanocomposite Nd_vFe_<bal>Co_wNb_xCu_yB_z(v=6-8.5, w=0-10, x=0-2.5, y=0-0.5, z=6-7 at%) magnet alloys was investigated by means of transmission electron microscopy(TEM), three-dimensional atom probing(3DAP), and Mossbauer spectroscopy.It was found by TEM that a small amount of amorphous phase remains in the intergranular region between crystal grains of αFe and Nd_2Fe_<14>B even after heat treatment.The results of 3DAP showed that Nb and B atoms are significantly enriched in the remaining amorphous phase.Mossbauer spectroscopy revealed that the volume fractions of both the amorphous phase and the Nd_2Fe_<14>B phase increase with increasing Nb content.The coercivity-enhancing effect of Nb addition is discussed on the basis of the above information.
社団法人日本磁気学会の論文
2000-04-15