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Precipitation in NdFeB-type magnet materials

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4 Author(s)
Parker, S.F.H. ; University of Salford, Salford, U.K. ; Pollard, R.J. ; Lord, D.G. ; Grundy, P.J.

The microstructure of sintered magnets and melt-spun samples made from Nb-containing (Nd,Dy)FeB material has been investigated using transmission and scanning electron microscopy, X-ray microanalysis and thermogravimetric analysis. Comparison of the sintered specimens with NdDyFeB and NdFeB magnets revealed the existence of two additional phases. One of these is an Fe2Nb Laves compound. The second additional phase takes the form of small Nb-containing coherent precipitates within the main Nd2Fe14B grains. In the sintered magnet these particles ranged in size from 20-50 nm. Melt-spun ribbon contained a dispersion of smaller inclusions, typically 5-10 nm in diameter. The presence of these precipitates may be related to the enhanced coercivity found in the magnet and melt-spun samples.

Published in:

Magnetics, IEEE Transactions on  (Volume:23 ,  Issue: 5 )

Date of Publication:

Sep 1987

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