Short range order transformation and magnetostriction of Fe₈₃Ga₁₇ ribbons

The relationship between magnetostriction and structure of melt-spun Fe₈₃Ga₁₇ ribbons are investigated by XRD and M?ssbauer spectrum technique (MS). As the heat-treatment temperature increases from 650oC to 800℃, the magnetostriction coefficient of Fe₈₃Ga₁₇ ribbon first increases and then decreases. The largest magnetostriction coefficient (-578.4 ppm) is achieved in those specimens quenched at 750℃. According to the XRD and M?ssbauer spectrum analysis, a small quantity of DO₃ phase is precipitated in Fe₈₃Ga₁₇ ribbons when quenched from 650℃ and the DO₃ phase is gradually transformed into B2-like phase if quenched at higher temperature. However, both DO₃ and B2-like phases disappear when the temperature increases up to 800℃. From this point of view, B2-like phase might be beneficial to the enhancement of magnetostrictive properties of melt-spun ribbons.