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
Cite this article:
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.
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.
1 Kim A S. J Appl Phys, 1988; 63: 3975 2 Xiao Y, Strnat K J, Mildrum H F, Ray A E. In: Herget C, Poerschke R eds., Proc 9th Int Workshop on Rare Earth Magnets and their Applications and 5th Int Symposium on Magnetic Anisotropy and Coercivity in Rare Earth-Transition Metal Alloys, Vol.Ⅰ, 31, Aug. 3 Sep., 1987, Bad Soden, FRG, Bad Honnef 1, FRG: DPG-GmbH, 1987: 467 3 Tokunaga M., Kogure H, Endoh M, Harada H IEEE Trans Magn, 1987; 23: 2287 4 Rodewald W, Wall B. J Magn Magn Mater, 1989; 80: 57 5 Parker S F H, Grundy P J, Fidler J. J Magn Magn Mater, 1987; 66: 74 6 Ishikawa T, Hamada Y, Ohmort K. IEEE Trans Magn, 1989; 25: 3434
