Co含量对FeCoPB非晶合金软磁性能和弯曲韧性的影响

Effect of Co Content on the Soft Magnetic Properties and Bending Ductility of FeCoPB Amorphous Alloys

采用熔体旋淬的方法制备了FeCo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。

Fe-Co-P-B amorphous alloys with high FeCo contents(up to 87at%)were synthesized by melt spinning method.The effects of the metallic element Co on glass formation ability(GFA),thermal stability,and magnetic properties of Fe-Co-P-B amorphous alloys 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(T_(c))of the present Fe-Co-P-B alloys obviously increases with the substitution of Fe by Co,and the coercivity(Hc)increases.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 an important way to obtain Fe-based amorphous with both excellent soft-magnetic properties and good bending ductility,which can avoid annealing-induced embrittlement.