Crystallization behavior of co-containing FINEMET amorphous alloy melt-spun ribbon

The glass forming ability (GFA) of Fe68.5Si13.5B9Cu1Nb3Co5 was investigated, and the crystallization kinetics of amorphous Fe68.5Si13.5B9Cu1Nb3Co5 melt-spun ribbons was studied by the Differential Scanning Calorimeter (DSC) method in the mode of continuous heating. The apparent activation energy Ex, Ep1 and Ep2 (356.19±37.11, 288.12±9.63 and 407.82±20.10 kJ/mol, respectively) derived from the Kissinger plots were calculated by the onset and peak temperatures Tx, Tp1, Tp2, which display a strong dependence on the heating rates. The crystallization behavior during continuous heating at 10 K/min to 823 K, 923 K and 1023 K were investigated using X-ray diffractometry (XRD) and transmission electron microscopy (TEM). As a result, the nanocrystalline α-Fe(Si) could be obtained when the temperature was up to 823 K, and no new phase was found due to adding component Co to FINEMET (Fe73.5Si13.5B9Cu1Nb3).