铁基非晶复合材料的磁学性能研究

采用水冷铜坩埚磁悬浮熔炼和负压铜模吸铸法,制备了Fe-15Mn-5Si-xCr-0.2C(wt.%)非晶复合材料,由XRD表征试样的物相组成,采用VSM结合M-H曲线和B-H曲线分析Cr元素含量变化对非晶复合材料磁学性能的影响.结果表明:Fe-15Mn-5Si-xCr-0.2C(x=1、2、4、6、8、10、12、13、14)试样由α-Fe相、γ-Fe相和非晶相三部分组成.Cr元素含量的增加使得合金混合焓减小而混合熵增加,Fe-15Mn-5Si-14Cr-0.2C试样中非晶相和α-Fe相的协同作用,使得试样的软磁性能最优,其矫顽力和饱和磁感应强度分别达到为16.12 A/m、5.1 T.

Study on magnetic properties of Fe-based amorphous composites

The Fe-15Mn-5Si-xCr-0.2C(wt.%) amorphous composite material was prepared by using water-cooled copper crucible smelting and copper mold suction casting. XRD was used to characterize the phase composition of the sample. Vibrating Sample Magnetometercombined with M-H and B-H curves were used to analyze the effect of the change of the Cr element content on the magnetic properties for amorphous composite material. The results show that the Fe-15Mn-5Si-xCr-0.2C (x=1, 2, 4, 6, 8, 10, 12, 13, 14) samples are composed of α-Fe phase, γ-Fe phase and the amorphous phase. As thecontent of Cr element increases, the mixing enthalpy decrease while the mixing entropy increase. The synergistic effect of α-Fe phase and the amorphous phase made the Fe-15Mn-5Si-14Cr-0.2C exhibit the best soft magnetic properties, which the coercive force and saturation magnetization are 16.12A/m and 5.1T, respectively.