The coercive field, H_c, in rapidly quenched Nd-Fe-B was found to increase for samples with excess of Nd. In addition, H_c strongly depends on the Fe/B ratio, increasing from 1.67 T for Fe/B = 1.07 to 2.05 T for Fe/B = 14.6 in Nd_(30)(Fe,B)_(70). The increase in H_c seems to correlate with an increase of the gamma -Nd phase in the sample. The initial magnetization curves of Nd_(30)(Fe,B)_(70) show that the domain wall pinning plays a more important role as the Fe/B ratio increases. Thus, gamma -Nd may play an important role in promoting a pinning mechanism. The excess of Nd in rapidly quenched Nd-Fe-B samples was also found to promote growth of Nd_2Fe_(14)B grains elongated in shape.
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机译：Nd-Fe-B快速淬火的矫顽场H_c对于过量Nd的样品发现增加。此外，H_c强烈依赖于Fe / B比率，从Nd_（30）（Fe，B）_（70）中的Fe / B = 1.07的1.67 T增加到Fe / B = 14.6的2.05T。 H_c的增加似乎与样品中γ-Nd相的增加相关。 Nd_（30）（Fe，B）_（70）的初始磁化曲线表明，随着Fe / B比的增加，畴壁钉扎起着更重要的作用。因此，γ-Nd可能在促进钉扎机制中起重要作用。还发现在快速淬火的Nd-Fe-B样品中过量的Nd会促进形状细长的Nd_2Fe_（14）B晶粒的生长。
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