Magnetostriction and microstructure of the melt-spun Fe83Ga17 alloy ribbons

Fe₈₃Ga₁₇ alloy ribbons with four thicknesses were prepared by the melt-spun method. The measured results show that magnetostriction is related to the thickness of the ribbons, and its maximum value, −2100 ppm, has been obtained in the ribbon with a thickness of 75 μm. The results of the X-ray diffraction (XRD) and the differential scanning caloric (DSC) show that a phase with DO₃ structure emerges in those ribbons with the thicknesses of 45, 55 and 75 μm, and a phase transition of A2 + DO₃ → A2 occurred at 669°C for the ribbon with the thickness of 75 μm. The increase in the cooling rate can restrain the precipitation of the Ga-rich phase in the ribbon. It is considered that the giant magnetostriction of ribbons originates from the A2 + special DO₃ structure and shape magnetic anisotropy. Translated from Acta Metallurgica Sinica, 2006, 42(2): 177–180 [译自: 金属学报]