Amorphous ribbons of (Ni0.75Fe0.25)78-xNbxSi10B12 (x = 0, 5) were prepared by a single roller melt-spinning technique in air atmosphere. The crystallization kinetics of the alloys were investigated by means of continuous heating, and the activation energies of the alloys were calculated using Kissinger plot method and Ozawa plot method on the basis of differential thermal analysis data. The crystallization products were analyzed by X-ray diffraction. After the (Ni0.75Fe0.25)78Si10B 12amorphous alloy was annealed at the temperatures 715 and 745 K, a single phase of γ-(Fe, Ni) solid solution with grain sizes of about 10.3 and 18.5 nm, respectively, precipitates in the amorphous matrix. The crystallized phases are γ-(Fe, Ni) solid solution, Fe2Si, Ni2Si, and Fe3B after annealing at 765 K. The (Ni0.75Fe0.25)73Nb5Si10 B12 amorphous alloy was annealed at 720, 750, and 800 K; and the crystallization phases, γ-(Fe, Ni) solid solution, (Fe, Ni)23B6, Ni31Si12 and Nb2NiB0.16 form simultaneously.
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