Abstract
The crystallization of amorphous Fe 73.5Si 13.5B 9Cu 1Nb 1X 2 (X = Zr, Nb, Mo, V) was investigated by combined use of differential scanning calorimetry, X-ray diffraction and electron microscopy techniques. The addition of refractory elements raises thermal stability of the amorphous alloys in the order V < Mo < Nb < Zr. The nanocrystallization reaction exhibits a low rate kinetic, as denotes the value close to 1 of the Avrami index. The volume fraction of the nanophase for the same annealing conditions decreases in the order V > Mo > Nb > Zr but a maximum value of about 65% is found for all cases. Refractory element alloying controls the mean grain size of the Fe,Si nanocrystals, growing up to a value in the range 10–18 nm for the alloys in the sequence V > Mo > Nb > Zr.
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