中文摘要：

对Nd60-xPrxFe30Al10（x=0,9,15,at%）大块非晶合金的磁粘滞行为进行了研究,进而分析了该类合金的矫顽力产生机理。结果表明：Nd60-xPrxFe30Al10（x=0,9,15）合金在室温均表现为硬磁性,随着Pr元素含量的增加,合金的内禀矫顽力iHc逐渐减小。在合金的不可逆磁化率χirr随外磁场变化的曲线中,均在各自的内禀矫顽力附近出现了明显的峰。Pr元素部分替换Nd元素后,基本不影响合金的磁粘滞变化趋势。当Pr元素含量从0at%增加到15at%时,合金的热涨落场Hf略有减小,从11.1mT减小到9.9mT;激活体积Va由2.6×10-18cm3增加到2.9×10-18cm3;激活直径Da由17.1nm增加到17.7nm。激活直径Da的值与Nd基大块非晶里的纳米晶团簇（cluster）的尺寸相当,这可能是该类合金具有明显硬磁性的原因之一。

英文摘要：

The magnetic viscosity of the bulk amorphous Nd60-xPrxFe30Al10 （x=0, 9, 15） alloys were investigated, and the coercivity mechanism was discussed. The results show that the bulk amorphous Nd60-xPrxFe30Al10 （x=0, 9, 15） alloys present hard magnetic behavior at room temperature. The intrinsic coercivity of the bulk amorphous decreases with increasing of the Pr addition from 0at% to 15at%. A single sharp and narrow peak close to the coercivity appears in the irreversible susceptibility （Xirr） curve for each alloy. The addition of Pr has little influence on the magnetic viscosity of the alloys. With the substitution of Pr for Nd, the fluctuation field Hf decreases from 11.1 mT to 9.9 mT, and the activation volume V, increases from 2.6 ×10^18 cm3 to 2.9 × 10^18 cm3, which leads to an increase of the activation diameter Da from 17.1 nm to 17.7 nm. The value of Da deduced from the magnetic viscosity measurements is similar to the size of clusters of Nd-based bulk amorphous alloys, which may be responsible for the hard magnetic property exhibited at room temperature.