Abstract
In the present paper the influence of 1-h annealing (temperature range from 300 to 800 K) on magnetic, plastic and electrical properties of the Fe 75.75Ag 0.25Nb 2Si 13B 9, Fe 75.75Ag 0.25Nb 2B 22, Fe 74.75Ag 0.25Co 5Nb 2B 18 amorphous alloys were carefully examined. For all the tested alloys the enhancement of magnetic permeability effect was observed—i.e. initial magnetic permeability measured at room temperature for annealed samples shows a sharp maximum. A possible mechanism explaining this effect is discussed in detail. Moreover it was found that at room temperature plastic deformation of the annealed samples depends on the progress of structural relaxation (free volume content). Activation energies and preexponential factors of the first stage of crystallization process were determined from the isochronal resistivity curves measured with different heating rates (Kissinger method). The Curie temperatures from the magnetization curves versus temperature were also determined.
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