Hyperfine structure changes in iron-base amorphous alloys produced by high current density electropulsing

The effects of high current density electropulsing on the hyperfine structure of amorphous alloys Fe₇₃Si_9.5B_17.5, Fe₇₅Si₁₀B₁₅, and Fe₇₉Si₇B₁₄ were investigated by Mössbauer spectroscopy. Electropulsing influenced the microstructure at a temperature well below the bulk crystallization temperature. In the alloy having least boron (or highest concentration of Fe), α-Fe particles ≃3 nm in size precipitated from the amorphous matrix, giving a change in internal magnetic field.