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采用铜模吸铸法制备了Fe64-xCoxNd7B25Nb4(x=0～40)块体合金,利用X射线衍射仪(XRD)、差示扫描量热仪(DSC)和振动样品磁强计(VSM)研究了该体系合金的非晶形成能力、晶化过程和磁性能。结果表明:Fe64-xCoxNd7B25Nb4(x=0～40)块体合金具有良好的非晶形成能力。在Co含量为0at%～40at%范围内,合金基本为非晶态。该系合金铸态时为软磁性,晶化处理后则表现为硬磁性。随着Co含量的不同,合金的晶化行为和晶化后的产物及对应的磁性能均有明显的变化。不含Co元素时,合金发生两级晶化反应;晶化过程中出现了亚稳相Fe23B6,随着退火温度的升高,Fe23B6分解为Fe3B和α-Fe相。添加Co元素后,合金只发生一级晶化反应。Co含量为20at%的合金在1 003 K退火后,内禀矫顽力高达1 164 kA/m。
The Fe64-xCoxNd7B25Nb4 (x = 0 ~ 40) bulk alloys were prepared by copper die-casting method and characterized by X-ray diffractometry (XRD), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM) The system of amorphous alloy formation, crystallization and magnetic properties. The results show that the Fe64-xCoxNd7B25Nb4 (x = 0 ~ 40) bulk alloy has good amorphous formation ability. In the Co content of 0at% ~ 40at% range, the alloy is essentially amorphous. The alloy is soft-cast as-cast and hard-magnetic after crystallization. With the different content of Co, the crystallization behavior of the alloy and the product after crystallization and the corresponding magnetic properties have obvious changes. In the absence of Co, the alloy undergoes two-stage crystallization reaction, and the metastable phase Fe23B6 appears during crystallization. As the annealing temperature increases, Fe23B6 decomposes to Fe3B and α-Fe phases. After addition of Co element, the alloy only undergoes first-order crystallization reaction. After annealing at 1 003 K, the alloy with Co content of 20 at% has an intrinsic coercivity of 1 164 kA / m.