晶化对CoFeBSiNb非晶合金组织及磁性能的影响

Effect of Crystallization on Microstructure and Magnetic Properties of CoFeBSiNb Amorphous Alloy

采用铜模吸铸法制备直径为2 mm的Co_(47.6)Fe_(20.4)B_(21.9)Si_(5.1)Nb_5非晶合金。利用X射线衍射仪(XRD)、差示扫描量热仪(DSC)、振动样品磁强计(VSM)和显微硬度计研究了晶化对合金相结构、磁性能及显微硬度的影响。结果表明:Co_(47.6)Fe_(20.4)B_(21.9)Si_(5.1)Nb_5非晶合金退火后的晶化过程为非晶相→非晶相+Fe_(23)B_6相→Fe_2B+Fe_3Si+Co_7Fe_3+未知相。该合金的饱和磁化强度随退火温度的升高先降后升,在1123 K退火后最高达到93.14 A·m^2·kg^(-1)。合金晶化后具有极高的显微硬度,在1073 K退火后显微硬度高达1721 HV。

Co_（47.6）Fe_（20.4）B_（21.9）Si_（5.1）Nb_5 amorphous alloy with the diameter of 2 mm was prepared by copper mold suction casting method. The effects of crystallization on the microstructure, magnetic properties and microhardness of the alloy were investigated by X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, vibrating sample magnetometer （VSM） and microhardness tester. The results indicate the crystallization process of Co_（47.6）Fe_（20.4）B_（21.9）Si_（5.1）Nb_5 amorphous alloy after annealing is：amourphous→amourphous ＋Fe_（23）B_6→Fe_2B＋Fe_3Si＋Co_7Fe_3＋unknown. The saturation magnetization of the alloy decreases firstly and increases subsequently with the increase of annealing temperature. The highest saturation magnetization of the alloy annealed at 1123 K is 93.14 A·m^2·kg^（-1）. Especially, the alloy exhibits super high microhardness after crystallization, The microhardness of the alloy annealed at 1073 K can reach 1721 HV.