Y取代对Pr-Nd-Fe-B合金微观结构和磁性能的影响

Effect of Y substitution on the microstructure and magnetic properties of Pr-Nd-Fe-B alloy

摘要: 基于熔体快淬技术，研究了不同Y取代量对（Pr_0.25Nd_0.75）_1-xY_x_13.9Fe_80.1B₆合金物相组成、磁性能、晶间磁相互作用和微观结构的影响.结果表明，适量Y替代Pr、Nd元素，可以抑制Fe₃B相的形成，且合金矫顽力温度稳定性增强.当Y取代Pr、Nd元素的量为30 %时，居里温度仅轻微从307 ℃下降至302 ℃. Y取代具有一定程度的晶粒细化作用，有助于改善合金的微观结构.此外，Y取代还可以增强主相晶粒间的交换耦合作用.

Abstract: The effects of Y substitution on the phase composition, magnetic properties, intergrain exchange coupling and microstructure of (Pr_0.25Nd_0.75)_1-xY_x_13.9Fe_80.1B₆ alloy fabricated by melt spinning were studied. It is found that a proper amount of Y substitution can inhibit the formation of Fe₃B phase and improve the thermal stability of coercivity. When 30 % of Pr and Nd is replaced by Y, the Curie temperature of the alloy only slightly decreases from 307 ℃ to 302 ℃. The substitution of Y can refine the grain size and help to improve the microstructure of the alloy. In addition, Y substitution can also enhance the exchange coupling interaction between main phase grains.