Abstract
The effect of Cu addition on the glass forming ability, nanocrystallization process and soft magnetic properties of the Fe76.5C6.0Si3.3B5.5P8.7 bulk metallic glass has been studied. In spite of relatively high C contents of the alloy, with only 0.5% Cu addition, the primary phase was successfully changed from metastable carbide Fe23C6 phase to stable alpha-Fe phase and the nucleation rate at the early stage of crystallization was significantly increased. Nanocrystallization of the Fe76.0C6.0Si3.3B5.5P8.7Cu0.5 (at.%) bulk metallic glass was studied through isothermal annealing treatments at temperature below the crystallization temperature of the alloy. With annealing at Tx−50°C for 30min, a large number of very fine regions (<3nm) with ordered atomic arrangements embedded in the amorphous matrix were observed. Upon further annealing, nanocrystals of alpha-Fe phase were formed improving soft magnetic properties of the sample, which confirms the soft magnetic nanocrystallization phenomenon in Fe76.0C6.0Si3.3B5.5P8.7Cu0.5 (at.%) bulk metallic glass. By controlling the annealing parameters as well as minor Cu contents, magnetic properties of the Fe76.5C6.0Si3.3B5.5P8.7 (at.%) bulk metallic glass were effectively optimized for practical applications.
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