Abstract
Abstract Fe81−xGaxB15Nb3Cu1 (x = 0, 3, 6, 9, 12 at%) ribbons were fabricated by using melt-spun method and their crystallization kinetics, magnetic properties and microstructure were investigated. We found that the small quenched-in Fe–Ga clusters were formed in the as-spun ribbons with Ga addition. Besides, proper Ga addition could suppress the precipitation of Fe2B phase. During annealing, addition of Ga could provide Fe–Ga clusters to be nucleation sites for the α-Fe(Ga) phase, and could inhibit the initial grain growth. With the increase of annealing temperature above 475 °C, the crystallization was controlled by both Fe–Ga and Cu clusters, which effectively refined the grain size by facilitating the nucleation and increased the crystallization volume fraction. Consequently, in the ribbon with 6 at% Ga, the grains turned out to be the minimum in the mean size of 8 nm, and the optimal soft magnetic properties with coercivity at 6.8 A/m and saturation magnetization at 167 emu/g were obtained at annealing temperature of 490 °C for 3 min.
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