Hydrogen in magnetic metallic glasses

Stress relief when hydrogen is introduced into magnetic glasses has been investigated by⁵⁷Fe Mössbauer spectrocopy and by scanning-electron microscopy. Mössbauer spectra of amorphous Fe82B12si6and Fe40Ni38Mo4B18were obtained under non-equilibrium conditions by electrolytically cahrging with hydrogen from an acid solution; hence the solubility limit of hydrogen was extened. A broad six-line pattern with a large positive shift of the spectrum center was observed, and associated with a decrease of the s-electron contact density at iron nuclei as a result of hydrogenation. Changes in the asymmetry of the lines suggest that quadrupole interactions are important. For the glass Fe5Ni73Si12B10, a paramagnet at room temperature, changes in the asymmetry of the lines were also observed. SEM photographs reveal that surface disintegration and surface separation from the bulk occur during hydrogenation.