Abstract
An Fe 73.5Si 15.5B 7Nb 3Cu 1 alloy with a crystalline grain structure is a soft magnetic material since it has good values of permeability while maintaining a saturation magnetization. Thermal annealing of an amorphous melt spun alloy in the temperature range 480–510°C produces a crystalline dispersion of Fe(Si) particles with diameter of the order of 14 nm embedded in a residual amorphous matrix with a higher crystallization temperature. In this work we correlate experimental measurements of grain size and crystallized fraction of an annealed amorphous Fe 73.5Si 15.5B 7Nb 3Cu 1 alloy, obtained, respectively, by X-ray diffraction and differential scanning calorimetry, with the particle size observed by transmission electron microscopy. The structural development is explained by considering the rejection of insoluble alloy atoms during crystallization with the formation of diffusion layers around the crystals. Growth rates are diminished by the accumulation of the slower diffusing atoms at the growing Fe(Si) interfaces; faster diffusing atoms by alloy enrichment of the residual amorphous matrix can cause a decrease in the nucleation frequency.
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