Abstract
The devitrification of FeSiB–XNb (X=Pd,Pt) amorphous alloys has been investigated by the combined use of calorimetric, thermomagnetic, X-ray diffraction and electron microscopy techniques. Substitution of Cu by Pd or Pt modifies the crystallization properties. In the first stage, beginning around 840 K, α-Fe(Si) and t-Fe 3B phases are formed. Precipitation of the bcc Fe(Si) phase does not show the kinetics found in Finemet-type alloys. The Fe 2B phase is formed during a second stage but Fe 3B subsists over a range of annealing temperatures.
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