Abstract
The influence of the holding time upon annealing on the temperature of the viscous–brittle transition (temperature of embrittlement) Tf in a cobalt-based amorphous alloy of the composition Co69Fe3.7Cr3.8Si12.5B11 with a very low saturation magnetostriction λs (<10–7) has been studied. It has been established that the dependence of the embrittlement temperature Tf on the of time of holding ta can be described by an Arrhenius equation and that the embrittlement at the annealing temperatures above and below 300°C is described by different kinetic parameters. In the alloy under study, irrespective of the holding time, embrittlement occurs in a very narrow range of annealing temperatures, which does not exceed 5 K. Based on the experimental data on the evolution of the hysteresis magnetic properties upon the isochronous annealings and upon the isothermal holding, the regime of heat treatment that ensures a very high (about 50000) magnitude of the permeability µ5 (H = 5 mOe, f = 1 kHz) without the transition of the alloy into a brittle state has been determined.
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