Abstract
Abstract The activation energies of amorphous Fe 78 Si 11 B 9 and nanocrystalline Fe 73.5 Cu 1 B 7 Si 15.5 Nb 3 alloys were tested by a high-sensitivity differential scanning calorimeter with different heating rates. Kissinger equation was adopted to calculate the activation energies of the primary phase of Fe 73.5 Cu 1 B 7 Si 15.5 Nb 3 alloy (295±5) kJ and the crystal phase of Fe 78 Si 11 B 9 alloy (370±3) kJ. The low activation energy of the primary phase for Fe 73.5 Cu 1 B 7 Si 15.5 Nb 3 alloy is related to the precipitation of Cu clusters. The precipitation kinetics of Cu clusters was analyzed. The calculated result of the mean radius R m of Cu cluster is 3 nm after aging for 3600 s at 773 K in Fe 73.5 Cu 1 B 7 Si 15.5 Nb 3 glass alloy and the maximum value of number density is 3.7 ×10 24 /m 3 after aging for 2.5 h at 773 K, which accords with K. Hono's observation (approximately 3 nm after annealing at 673 K or 3600 s). The density of Cu is in the order of 10 24 m −3 ).
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