EFFECT OF Nb ADDITION ON MICROSTRUCTURE OF (Nd,Dy)-(Fe,Co)-B MAGNETS

Acta Metall Sin

1991, Vol. 27

Issue (5): 120-124 DOI:

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EFFECT OF Nb ADDITION ON MICROSTRUCTURE OF (Nd,Dy)-(Fe,Co)-B MAGNETS

SONG Xiaoping;WANG Xiaotian;HUANG Qihua;LIU Junhai;YAO Yinliang Xi'an Jiaotong University

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SONG Xiaoping;WANG Xiaotian;HUANG Qihua;LIU Junhai;YAO Yinliang Xi'an Jiaotong University. EFFECT OF Nb ADDITION ON MICROSTRUCTURE OF (Nd,Dy)-(Fe,Co)-B MAGNETS. Acta Metall Sin, 1991, 27(5): 120-124.

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Abstract An addition of Nb up to 2 at.-％ into (Nd, Dy)-(Fe, Co)-B alloy causes to form the primary lath Fe_2Nb crystallization and to precipitate the hard magnetic grain. Both increases with the increasing Nb content. During sintering, part of Fe_2Nb dissolves within the 2:14:1 phase, and the Fe_2Nb along grain boundary hinders the growth of 2:14:1 grain. In annealing processing, the dissolved Nb in φ phase precipitates out, and this nearby the grain boundary diffuses into Nd-rich phase to form new Nb-containing grain and to increase the Nb content in Nd-rich phase.

Key words: NdFeB rare earth permanent magnet microstructure

Received: 18 May 1991

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