Amorphous alloy ribbons with nominal compositions of Fe80.5-xCoxSi3.5B13.5Cu1Nb1.5(x=0,3,5,7,9)were prepared by melt spinning technique,which is used to investigate the effects of Co content and annea-ling temperature on the soft magnetic properties and organization of amorphous nanocrystalline alloys.The Fe75.5Co5Si3.5B13.5Cu1Nb1.5 quenched amorphous alloy under annealing temperature of 510 ℃ form an amor-phous/nanocrystalline composite structure consisting of an amorphous matrix and nanograins and have excellent comprehensive soft magnetic properties,which contain the grain size D=13.5 nm,low coercivity Hc=2.5 A/m and high saturation magnetic induction intensity Bs=1.59 T.The magnetic domain structures on the surface of the ribbons at different annealing temperatures were observed by magnetic-optical kerr(MOKE)microscope.When the annealing temperature is 510 ℃ and the Co content x is 5,the internal stress release relative com-pletely,which leads to the uniform nanocrystalline microstructure and straight clearly striped domains,and the change of the magnetic domains corresponded to the change of Hc.
关键词
非晶纳米晶软磁合金/Co元素/矫顽力/磁畴/退火温度
Key words
amorphous nanocrystalline soft magnetic alloy/Co element/coercivity/magnetic domain/annealing temperature
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