摘要: 在纳米晶复合 Nd ₁₀ Fe _86−x B _x Nb ₄ (x = 6.5~22) 合金中， B 含量的变化对合金磁性能有重要影响。 B 元素的含量变化可以调整合金软、硬磁相的相对含量，适量的 B 含量可以使合金中软、硬磁性相间的交换耦合作用增强，从而提高合金的综合磁性能；过量的 B 元素的添加增加了合金中非磁性相的含量，导致了合金的综合磁性能的下降。 B 含量为 10 at% 的合金在退火温度为 690 ℃ ，退火时间为 4 min 时具有最佳的磁性能，为： j H c = 936.0 kA/m ， B r = 0.91 T ， (BH) max = 125.9 kJ/m ³ 。

Abstract: For the Nd₁₀Fe_86−xB_xNb₄ (x = 6.5 - 22) nanocomposite permanent alloys, the relative content of the soft magnetic phase and the hard magnetic phase is sensitive to B addition. Proper B addition can enhance the exchange coupling effect between soft and hard magnetic phases, resulting in improving the magnetic properties. More addition of B promotes the formation of non-magnetic phases which degrades the magnetic properties of the Nd 10 Fe 86−x B x Nb 4 (x = 6.5 - 22) alloys. When B = 10 at%, optimal magnetic properties can be obtained. That is, j H c =936.0 kA/m, B r = 0.91 T and (BH) max = 125.9 kJ/m³ for the Nd 10 Fe 76 B 10 Nb 4 alloy annealed at 690˚C for 4 minutes. It is due to the enhancement of exchange coupling effect between soft and hard magnetic phases.