Precipitation in NdFeB-type magnet materials
- 1 September 1987
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 23 (5), 2103-2105
- https://doi.org/10.1109/tmag.1987.1065299
Abstract
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.Keywords
This publication has 1 reference indexed in Scilit:
- Permanent magnet materials based on the rare earth-iron-boron tetragonal compoundsIEEE Transactions on Magnetics, 1984