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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.11 (2002)  >  pp.2885-2889

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Mössbauer Study on the Crystallization Process of α-Fe/Nd2Fe14B type Nanocomposite Magnet Alloy

Minoru Yamasaki1), Masaaki Hamano2) and Takayuki Kobayashi3)
1) Toda Kogyo Corporation
2) Mikuni-Makino Industrial Co., Ltd.
3) Department of Physics, Shiga University of Medical Science

In order to investigate the crystallization process of an α-Fe/Nd2Fe14B type nanocomposite magnet alloy, Mössbauer study has been carried out on Nd8Fe80Co4Nb1.5B6.5 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, Fe3B, Nd2Fe14B 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, Nd2Fe14B and metastable Fe3B phases are formed definitely and the amorphous phase decreases drastically but still remains as the intergranular phase. With increasing temperature, metastable Fe3B phase converts into α-Fe, Nd2Fe14B, and a part of the intergranular phases also crystallize to form α-Fe and Nd2Fe14B . 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 Nd2Fe14B.

Mössbauer study, α-Fe, Nd2Fe14B, Fe3B, amorphous, nanocomposite, exchange spring magnet, melt spinning

Received: July 08, 2002
Accepted: September 26, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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