Abstract
Fe81Ga19−xAlx (x = 0.2, 0.5, 3, 6, 9) alloy thin strips are obtained by melt spinning in a non-consumable arc furnace to investigate the effect of Al addition on the microstructure and magnetostriction properties of melt-spun Fe81Ga19 alloy thin strips. The results indicate that the addition of Al can refine the grains of Fe81Ga19−xAlx alloys. The melt-spun Fe81Ga19−xAlx alloy thin strips were composed of A2 phases and many amorphous phases, while modified D03 phase was also produced. The saturation magnetostrictive strain coefficient of the Fe81Ga18.8Al0.2 alloy was 343 ppm, which was significantly improved compared to the as-cast alloy. The analysis of the experimental data indicated that rapid quenching and Al addition led to relaxation of the crystal structure.Specifically, the coupling strength between the atoms of the Fe81Ga19−xAlx alloy thin strips decreased slightly, which was the main reason for the increase in the saturation magnetostrictive strain of the alloy thin strips.
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