Abstract
The effect of heat treatment in the temperature region from room temperature to 470 °C on the elastic modulus, internal friction and ΔE-effect in amorphous and nanocrystalline Fe-Cu-Nb-Si-B alloy was studied. The irreversible changes of Young's modulus and internal friction were observed for as-cast amorphous and as-quench rapidly nanocrystalized specimens. For both types of specimens these changes had a similar two-stage dependence on annealing temperature. The behaviour of elastic modulus and internal friction at the first stage are very similar to their behaviour in nano- and submicrocrystalline materials exibiting the so-called effect of the anomalous elastic modulus reduction. The phenomena observed are considered to be caused by nonequilibrium interfaces formed at the quenching process. The crystallization process is supposed to be responsible for the second stage.
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