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Ms均随退火温度的升高而逐渐增大.Fe78Co2Zr8Nb2B9Ta1合金的Hc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Hc在600℃退火后达到极小值.合金的GMImax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.
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