Xj. Zhang et al., METALLURGICAL PROCESSING OF ND2FE14B TYPE PERMANENT MAGNETIC-ALLOYS, Journal of materials processing technology, 48(1-4), 1995, pp. 461-467
The free iron observed in as-cast Nd2Fe14B type alloys is due to the p
resence of a peritectic reaction during solidification and adversely a
ffects the magnetic properties of the bonded magnets made from these a
lloys. It was found that the iron could be completely removed by eithe
r homogenization treatments or hydrogen processing. The findings of th
is investigation may be used to develop a new group of permanent magne
ts or to treat other alloys.