Nb添加量对FeBCu纳米晶合金组织结构、磁性能和退火脆性倾向的影响

Effect of Nb Addition on the Structure,Magnetic Properties and Annealing Embrittlement of A FeBCu Nanocrystalline Alloy

为改善FeBCu系纳米晶软磁合金的热处理工艺性,抑制其退火脆性倾向,利用X射线衍射仪、透射电子显微镜、差示扫描量热仪、振动样品磁强计和平板弯曲实验等测试手段,研究了Nb含量对Fe86-x B13Cu1Nbx(x=0~6)急冷合金条带的结构、热性能、结晶化组织、磁性能和退火脆性倾向的影响。结果表明:增加Nb量可有效提高非晶相的热稳定性、细化热处理后合金的α-Fe晶粒尺寸并改善其软磁性和退火脆性。其效果在Nb含量>2 at.%尤为显著,而当Nb含量≥5 at.%时趋于平缓。纳米晶合金退火脆性的改善主要源于其α-Fe晶粒尺寸和体积分数的降低。

To improve annealing process and decrease annealing embrittlement of Fe BCu nanocrystalline alloys, the effect of Nb content on the structure, thermal properties, crystallized structure, magnetic properties and brittleness of melt-spun Fe86-xB13Cu1Nbx(x = 0~6) alloy ribbons was investigated by using X-ray diffraction, transmission electron microscopy, differential scanning calorimeter, vibrating sample magnetometer, and bending test method. The results show that the increase of Nb content enhances the thermal stability of amorphous phase, and refines α-Fe grains, improves soft magnetic properties as well as reduces the annealing embrittlement of the annealed alloys. The addition effect on the structure and properties is significant when the Nb content exceeds 2 at.% and becomes moderate when Nb content ≥ 5 at.%. The decreased annealing embrittlement of the nanocrystalline alloys is mainly due to the reductions of both grain size and volume fraction of the α-Fe phase.