Structural transformations of Fe75Ni2Si8B13C2 amorphous alloy induced by thermal treatment

The structural transformations of the Fe75Ni2Si8B13C2 amorphous alloy under non-isothermal as well as under isothermal conditions were studied. The amorphous alloy was stable up to a temperature of 723 K when the multi-step structural transformation began. The primary crystallization starts already at 723 K by forming FexSi phase in amorphous matrix. At higher temperatures (between 780 and 800 K) beside the FexSi phase, the presence of the boron-iron-silicon phase (B2Fe15Si3) as well as the iron-boron (Fe2B) phase was detected. At higher temperatures the presence of only two phases, FexSi and Fe2B, was confirmed. The Fe content in the formed FexSi phase was determined as 81% (at 1273 K) and 86 % (at 780 K). The kinetic parameters of crystallization processes were determined by Kissinger and Ozawa methods.