Structure transformation and elements redistribution at heating of Fe73.5Nb3Cu1Si13.5B9 amorphous alloy

Abstract The evolution of structure and elements redistribution in rapidly quenched Finemet-type Fe 73.5 Nb 3 Cu 1 Si 13.5 B 9 alloy at heat treatments were investigated by differential scanning calorimetry (DSC), thermomagnetic analysis, Mossbauer spectroscopy (MS), and X-ray diffraction methods. The effect of the structural relaxation on the Curie point of amorphous phase ( T c A ) has been studied using DSC and magnetic measurements. Using both heating and isothermal DSC scanning modes, we found that T c A value increases with the treatment temperature, as well as with the increase of the treatment duration. MS analysis shows that the pre-crystallization process results in the changes of fine structure of amorphous phase spectra, which are caused by the components redistribution during the relaxation process, resulting in the Cu-rich clusters formation and subsequence appearance of nanocrystals.