Effect of hydrogen on the magnetoelastic behavior of amorphous transitional metal-metalloid alloys

Abstract

Internal friction and ΔE‐effect measurements have been made on Metglass 2826 and other ferromagnetic metallic glasses, electrolytically charged with hydrogen. Initially, the ΔE‐effect and magnetoelastic damping are strongly suppressed. The internal friction is dominated by a peak attributed to the stress‐induced reorientation of interstitial hydrogen atoms, with a mean activation energy of 0.5 eV. Various aging effects occur after charging. Recovery of charge‐induced bending is followed by a slower decline of the reorientation peak, a recovery of the ΔE‐effect, and an accompanying transient appearance of a magnetoelastic internal friction peak. The observed behavior indicates a strong interaction of hydrogen with domain walls, and leads to the prediction, confirmed experimentally, that hydrogen degrades the soft magnetic behavior of these alloys.