Abstract
A ternary (Fe0.82Ga0.18)85B15 alloy was vitrified by melt spinning at wheel velocities of over 28.5 m/s. Two exothermic peaks were observed at onset temperatures of 692 K and 787 K. The melt-spun amorphous alloy ribbon exhibits saturation magnetostriction of +30 × 10−6 at the field of 80 kA/m. The magnetostriction increased by crystallization, i.e. precipitation of the bcc-Fe(Ga) phase, and reached a maximum value of +62 × 10−6 in conjunction with good response which is same as that for the as-spun amorphous sample. The maximum value is equivalent to that of the random orientated polycrystalline Fe82Ga18 alloy. In addition, the crystallized Fe-Ga-B alloy had better response as compared with the polycrystalline Fe82Ga18 alloy. The reason why the Fe-Ga-B alloy exhibits the high magnetostriction even in the coexistent state with C16-Fe2B and L12-Fe3Ga phases, seems to result from the precipitation of the supersaturated bcc-Fe(Ga) solid solution with high Ga concentrations as the crystallization -included phase.
