The effect of Ta addition on the microstructure and magnetic properties of (Nd_0.4Pr_0.6)₉Fe_85-xTa_xB₆ nanocomposite magnets prepared by melt spinning was studied. Microstructure studies reveal that Ta addition is effective in refining the microstructure of nanocomposite magnets. The temperature coefficient of coercivity (β) is improved from −0.350%/°C for x = 0 to −0.329%/°C for x = 2 in the temperature range 27 °C-175 °C. With the increase in x from 0 to 2, the coercivity of the alloys is improved remarkably from 6.1 kOe to 10.4 kOe at the expense of remanence. As a result, the optimal magnetic properties with H_ci = 7.5 kOe and (BH)_max = 23.4 MGOe have been achieved at x = 1. Minor hysteresis loops were analyzed to determine the coercivity of (Nd_0.4Pr_0.6)₉Fe_85-xTa_xB₆ nanocomposite magnets by inhomogeneous domain wall pinning mechanism. The significant enhancement of magnetic properties mainly results from grain refinement achieved by introducing Ta.

研究了Ta的添加对熔纺制备的(Nd _0.4 Pr _0.6 ) ₉ Fe _85-x Ta _x B ₆纳米复合磁体的微观结构和磁性能的影响。微观结构研究表明，添加 Ta 可有效改善纳米复合磁体的微观结构。在 27 °C-175 °C 的温度范围内，矫顽力的温度系数 (β) 从 x = 0 的 -0.350%/°C 提高到 x = 2 的 -0.329%/°C。随着 x 从 0 增加到 2，合金的矫顽力从 6.1 kOe 显着提高到 10.4 kOe，但以剩磁为代价。因此，当H _ci  = 7.5 kOe 和 ( BH) _max  = 23.4 MGOe 在 x = 1 时已实现。通过非均匀畴壁钉扎机制，分析了较小的磁滞回线以确定 (Nd _0.4 Pr _0.6 ) ₉ Fe _85-x Ta _x B ₆纳米复合磁体的矫顽力。磁性能的显着增强主要是由于通过引入 Ta 实现的晶粒细化。