B对Fe94−xNb6Bx非晶合金热稳定性、软磁性能和电阻率的影响

摘要

采用单辊甩带法制备Fe94?xNb6Bx(x=13,15,17)(摩尔分数,x%)非晶合金,并用X射线衍射仪(XRD)、差示扫描量热分析仪(DSC)、振动样品磁强计(VSM)和四探针测试仪等研究B含量对其热稳定性、软磁性能和电阻率的影响规律.结果表明:Fe94?xNb6Bx非晶合金的晶化过程分两个阶段进行,Fe77B6Nb17合金具有高热稳定性和良好的非晶形成能力,其晶化起始温度Tx1为864 K,过冷液相区ΔTx、Trg和γ分别为48 K、0.524和0.359.Fe94?xNb6Bx非晶合金的饱和磁感应强度为80~108 A?m2/kg,电阻率为122~133μΩ?cm.合金的非晶形成能力和电阻率随B含量的增加而增加,软磁性能则随B含量的增加呈先增大后减小的趋势.Fe94?xNb6Bx非晶合金较高的非晶形成能力、优良的软磁性能和高电阻率使得其可以作为一种功能材料来使用.%Fe94?xNb6Bx (x=13, 15, 17) (mole fraction,x%) amorphous alloys were prepared by melt-spinning. The influence of B content on thermal stability, soft magnetic properties and electrical resistivity was investigated by X-ray diffractometry (XRD), differential scanning calorimetry (DSC), vibrating sample magnetometry (VSM) and four-point probe. DSC results indicate that the Fe94?xNb6Bx glassy alloys undergo two-stage crystallization events. The Fe77Nb6B17 glassy alloy exhibits high thermal stability and excellent glass forming ability, in which onset crystallization temperature (Tx1) is 864 K, and supercooled liquid region (ΔTx),Trg,γ are 48 K, 0.524, and 0.359, respectively. The saturation magnetization and electrical resistivity of the Fe94?xNb6Bxglassy alloys are 80?108A?m2/kgand 122?133 μΩ?cm, respectively. With increasing the B content in the Fe94?xNb6Bx glassy alloys, the glass forming ability and electrical resistivity increase, while the soft magnetic properties firstly increase and then decrease. These newly developed Fe-based glassy alloys can be used as a functional material due to their high glass forming ability, excellent soft magnetic properties and good electrical resistivity.