Moessbauer Study on the Crystallization Process of .ALPHA.-Fe/Nd2Fe14B type Nanocomposite Magnet Alloy.
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概要
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In order to investigate the crystallization process of an α-Fe/Nd<SUB>2</SUB>Fe<SUB>14</SUB>B type nanocomposite magnet alloy, Mössbauer study has been carried out on Nd<SUB>8</SUB>Fe<SUB>80</SUB>Co<SUB>4</SUB>Nb<SUB>1.5</SUB>B<SUB>6.5</SUB> alloy ribbons prepared by melt spinning and post-heat-treatment at 600, 650, 700 and 760°C. The relative mass fractions of the α-Fe, Fe<SUB>3</SUB>B, Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and the intergranular phases, in crystallization process, were estimated from Mössbauer line-intensities. As-quenched alloys are practically amorphous states and start to crystallize at 600°C, but the crystallized grains are still so fine as to be observed with X-ray diffraction method and the Mössbauer spectroscopy. Around 650°C, α-Fe, Nd<SUB>2</SUB>Fe<SUB>14</SUB>B and metastable Fe<SUB>3</SUB>B phases are formed definitely and the amorphous phase decreases drastically but still remains as the intergranular phase. With increasing temperature, metastable Fe<SUB>3</SUB>B phase converts into α-Fe, Nd<SUB>2</SUB>Fe<SUB>14</SUB>B, and a part of the intergranular phases also crystallize to form α-Fe and Nd<SUB>2</SUB>Fe<SUB>14</SUB>B . At 760°C being the optimum heat-treating temperature to obtain the alloy with the best magnetic properties, about 10 mass% of the intergranular phases is considered to remain between the grains of α-Fe and Nd<SUB>2</SUB>Fe<SUB>14</SUB>B.
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