Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 23    No. 9    September 2013

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Phase evolution and magnetic properties of Nd9.5Fe81Zr3B6.5 nanocomposite magnets
Hong-chao SHENG1,2,3, Xie-rong ZENG1,2,3, Chao-xiang JIN1,2,3, Hai-xia QIAN1,2,3

1. Shenzhen Key Laboratory of Special Functional Materials, Shenzhen University, Shenzhen 518060, China;
2. College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China;
3. Shenzhen Engineering Laboratory for Advanced Technology of Ceramics, Shenzhen 518060, China

Abstract:Melt-spun Nd9.5Fe81Zr3B6.5 ribbons were prepared by the melt-spinning technique. The phase evolution and magnetic properties were studied by X-ray diffraction, differential scanning calorimetry, transmission electron microscopy observations, and magnetization measurements. It is indicated that melt spinning at different wheel velocities caused the as-quenched ribbons to have distinctive structure. The phase transformation of the ribbons during annealing takes place in two steps: α-Fe transforms from the amorphous phase firstly, followed by formation of Nd2Fe14B phase. With increasing the initial quenching rate, the microstructure of optimally heat treated ribbons becomes coarser, which results in the weakening of the exchange coupling effect between the hard and soft phase. This leads to drastic deterioration of magnetic properties of annealed ribbons with increasing the initial quenching rate.


Key words: Nd-Fe-B; nanocomposites; Zr addition; magnetic properties

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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