| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 815100 | Rare Metal Materials and Engineering | 2013 | 4 Pages |
The activation energies of amorphous Fe78Si11B9 and nanocrystalline Fe73.5Cu1B7Si15.5Nb3 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 Fe73.5Cu1B7Si15.5Nb3 alloy (295±5) kJ and the crystal phase of Fe78Si11B9 alloy (370±3) kJ. The low activation energy of the primary phase for Fe73.5Cu1B7Si15.5Nb3 alloy is related to the precipitation of Cu clusters. The precipitation kinetics of Cu clusters was analyzed. The calculated result of the mean radius Rm of Cu cluster is 3 nm after aging for 3600 s at 773 K in Fe73.5Cu1B7Si15.5Nb3 glass alloy and the maximum value of number density is 3.7 ×1024 /m3 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 1024 m−3).
