Crystallization of amorphous Fe81B13.5Si3.5C2

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Abstract
Crystallization of 25-mm wide ribbon of metallic glass Fe81 B13.5Si3.5 C2 (Metglas 2605SC) has been studied by differential scanning calorimetry, measurement of magnetic coercivity, x-ray diffraction, and transmission electron microscopy. Samples were annealed isothermally for 5–180 min between 345 and 450 °C. Dendritic precipitates of alpha iron are detected after anneals ?375 °C and cause the first exothermic peak. A second exothermic peak corresponds to crystallization of the balance of the matrix primarily into body-centered-tetragonal (bct) grains. The results are collated in a time-temperature-coercivity diagram. The minimum coercivity after field annealing is 0.03 Oe.