Hydrogen-induced structural relaxation in bulk metallic glasses

In order to clarify the hydrogen-induced structural relaxation (HISR) of hydrogenated bulk and marginal metallic glasses (BMG and MMG), the hydrogen concentration (CH) dependence of the peak temperature (Tp) and the peak height (Qp−1) of the hydrogen internal friction peak (HIFP) in a-Zr55Cu30Al10Ni5 (numbers indicate at.%) (BMG), a-Zr54Cu30Al10Ni5Si1 (MMG) and a-Zr40Cu49Al10Si1 (MMG) were studied. It is found that the Tp versus CH data and the Qp−1 versus CH data are well explained by the relationships of Tp = ΔTp exp(−CH/τH) + Tp,0 and Qp−1∝ln(CH/τH), respectively, not only for all the present metallic glasses but also for various Zr-base BMG and MMG reported. The characteristic CH dependence of Tp and Qp−1 was attributed to effects of the HISR. The detailed features of the CH dependence of Tp and Qp−1 were discussed in the light of material parameters and HISR.