Co含量对FeCoPB非晶合金软磁性能和弯曲韧性的影响

采用熔体旋淬的方法制备了Fe Co含量达到87 at%Fe-Co-P-B系非晶合金薄带，研究了金属元素Co对Fe-Co-P-B系非晶合金的形成能力、软磁性能和弯曲韧性的影响规律。该合金系具有高的饱和磁化强度1.75～1.84 T，且热处理后薄带仍具有良好的弯曲韧性。添加Co元素后，提高了合金的居里温度，矫顽力升高。对薄带样品施加12 MPa的拉应力，合金的矫顽力由12.8 A/m降低到6.5 A/m。因此，通过成分和应力的调控可以避免Fe基非晶合金热处理引起的弛豫脆性问题，为获得具有优异软磁性能和良好弯曲韧性的Fe基非晶合金提供重要途径。

Effect of Co content on the soft magnetic properties and bending ductility of FeCoPB amorphous alloys

Fe-Co-P-B amorphous alloys with high FeCo contents (up to 87 at%) were synthesized. The effects of the replacement of Fe by Co on glass formation ability (GFA), thermal stability, and magnetic properties were investigated in details. Fe87-xCoxP2B11 (x=5-7) amorphous alloys have high saturated magnetization (from 1.75 T to 1.84 T) and good bending ductility even after annealing. The Curie temperature (Tc) of the present Fe-Co-P-B alloys obviously increases with the substitution of Fe by Co, deteriorating the coercivity (Hc). The tensile stress applied to the Fe-based amorphous alloys can obviously reduce Hc from 12.8 A/m to 6.5 A/m with the tensile stress change from 0 to 12 MPa. The optimal adjustment of both the alloy composition and stress provides a important way to obtain Fe-based amorphous with both excellent soft-magnetic properties and good bending ductility, which can avoid annealing-induced embrittlement.