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采用单辊快淬法制备Fe78Co2Zr8Nb2B9M1(M=Ta、Cu)非晶合金薄带,在不同温度下对合金进行等温热处理。利用DTA、XRD、TEM、VSM和阻抗分析仪研究合金的热行为、微观结构、磁性能及巨磁阻抗效应。结果表明,晶化初期,Fe78Co2Zr8Nb2B9Ta1非晶合金析出α-Mn亚稳相和α-Fe(Co)相,Fe78Co2Zr8Nb2B9Cu1非晶合金仅析出α-Fe(Co)相。600℃退火后的Fe78Co2Zr8Nb2B9Cu1合金中晶化相的平均晶粒尺寸小于Fe78Co2Zr8Nb2B9Ta1合金。合金的M s均随退火温度的升高而逐渐增大。Fe78Co2Zr8Nb2B9Ta1合金的H c在600℃退火后明显增大,这与α-Mn型相的析出有关;而Fe78Co2Zr8Nb2B9Cu1合金的H c在600℃退火后达到极小值。合金的GMI max值随退火温度增加先上升后下降。Fe78Co2Zr8Nb2B9Cu1合金具有比Fe78Co2Zr8Nb2B9Ta1合金更显著的GMI效应。
The Fe78Co2Zr8Nb2B9M1 (M = Ta, Cu) amorphous alloy ribbon was prepared by single roll rapid quenching method, and the alloy was isothermally heat treated at different temperatures. The thermal behavior, microstructure, magnetic properties and Giant Magneto-Impedance effect of the alloy were investigated by DTA, XRD, TEM, VSM and impedance analyzer. The results show that α-Fe metastable phase and α-Fe (Co) phase are precipitated in Fe78Co2Zr8Nb2B9Ta1 amorphous alloy and α-Fe (Co) phase is precipitated in Fe78Co2Zr8Nb2B9Cu1 amorphous alloy. The average grain size of the crystallized phase in Fe78Co2Zr8Nb2B9Cu1 alloy annealed at 600 ℃ is smaller than that of Fe78Co2Zr8Nb2B9Ta1 alloy. The M s of the alloys gradually increased with the increase of annealing temperature. The H c of Fe78Co2Zr8Nb2B9Ta1 alloy increases obviously after annealing at 600 ℃, which is related to the precipitation of α-Mn phase. The H c of Fe78Co2Zr8Nb2B9Cu1 alloy reaches the minimum after annealing at 600 ℃. The GMI max value of alloy increases first and then decreases with the increase of annealing temperature. Fe78Co2Zr8Nb2B9Cu1 alloy has more significant GMI effect than Fe78Co2Zr8Nb2B9Ta1 alloy.