Abstract
In this paper, Fe40Ni38Mo4B18 and Fe40Ni38GaxB22-x (x=4, 6, 8 and 10) ribbons have been fabricated using the melt spinning method, and the effects of annealing temperature on the microstructure and magnetic properties have been investigated. Unlike the coarse grains of γ-(Fe, Ni) phase in annealed Fe40Ni38Mo4B18 ribbon, extremely refined nanostructure was found in the annealed Fe40Ni38GaxB22-x (x=4, 6, 8 and 10) ribbons, owing to that the charge transfer between Fe, Ni and Ga raised the binding forces of the atoms and thus greatly inhibited atoms diffusion. The novel nanostructure was identified as a single γ-(Fe, Ni, Ga) phase, in which a medium-range order structure and the conventional nano-grains were formed together. The soft magnetic properties were improved due to the grain refinement. Besides, the formation of the medium-range order structure in the alloys could have the great potential to inhibit the influence of the aging process on the soft magnetic properties.
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