Crystallization in Rapidly Quenched Fe-B-Si System with Additions of C and Cu

Glass formability and phase transformations in rapidly quenched ferromagnetic nano-structured (Fe₈₅B_15-xSi_x)_98-yC₂Cu_y (where x=0; 5 and y=0; 1) systems were investigated. The consecutive crystallization stages of bcc-Fe and borides were determined by resistometry, differential scanning calorimetry and by thermogravimetry, where the values of important transformation parameters were estimated and mutually correlated with the results from the structure analysis by TEM and XRD. Morphology of the nano-sized Fe grains in amorphous matrix and their transformation to borides matrix was observed by TEM in dependence on the chemical composition and thermal treatment. The effects of systematic alloying on the transformation process and on the resulting structure have been correlated with selected magnetic properties of the samples after suitable annealing.

Keywords:
metallic glasses; soft magnetic materials; nanocrystalline structure