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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.9 (2001)  >  pp.1858-1861

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.9 (2001)   pp.1858 - 1861 Next article>>

Microstructures and the Magnetic Properties of Fe3B/(Nd, Dy)2Fe14B Nanocomposite Microalloyed with Cu and Zr

Kagehisa Kajiwara1), Kazuhiro Hono1)2) and Satoshi Hirosawa3)
1) Graduate School of Pure and Applied Sciences, The University of Tsukuba
2) National Institute for Materials Science
3) Sumitomo Special Metals Co., Ltd.


The effect of Zr and Cu addition to a Nd3.4Dy1Fe72.3B18.5Cr2.4Co2.4 alloy on the microstructure and the magnetic properties of Fe3B/Nd2Fe14B nanocomposite has been investigated by a three-dimensional atom probe (3DAP) and transmission electron microscopy (TEM). Addition of a small amount of Zr and/or Cu is effective in improving the hard magnetic properties of the base alloy. Cu atoms form clusters in the early stage of crystallization, and Zr atoms are segregated at the interfaces of Fe3B/Nd2Fe14B being rejected from the Fe3B soft magnetic phase on the optimal heat-treated condition. This causes refining the nanocomposite microstructure, resulting in improved hard magnetic properties compared to those of the base alloy.


Keyword:
nanocomposite magnet, hard magnetic property, melt spinning, transmission electron microscopy, atom probe

Received: April 25, 2001
Accepted: June 12, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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