Abstract
The magnetic properties and phase components of rapidly quenched Fe 77.5Nd 4B 18.5 alloy as a function of quenching rate and heat treatment were studied. X-ray diffraction and thermomagnetic measurements show that the Fe 77.5Nd 4B 18.5 ingot consists of Nd 2Fe 14B, Fe 2B and α-Fe. The X-ray diffraction patterns of optimally annealed samples show only metastable Fe 3B phase which decomposes into Fe 2B and α-Fe at T a > 850 °C, but the thermomagnetic curves show the presence of the Nd 2Fe 14B phase. In the sample annealed at 950 °C for 60 min, Nd 1.1Fe 4B 4 appears in coexistence with Nd 2Fe 14B, Fe 2B and α-Fe. The Fe 77.5Nd 4B 18.5 alloy is found to have very good glass-forming ability. Samples prepared at quenching rates v s ⩾ 6.6 m s −1 are amorphous and magnetically soft. Annealing at about 650–670 °C gives the highest coercive field, which is nearly independent of quenching rate.
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