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 ( C H) dependence of the peak temperature ( T p) and the peak height ( Q p − 1 ) of the hydrogen internal friction peak (HIFP) in a-Zr 55Cu 30Al 10Ni 5 (numbers indicate at.%) (BMG), a-Zr 54Cu 30Al 10Ni 5Si 1 (MMG) and a-Zr 40Cu 49Al 10Si 1 (MMG) were studied. It is found that the T p versus C H data and the Q p − 1 versus C H data are well explained by the relationships of T p = Δ T p exp(− C H/ τ H) + T p,0 and Q p − 1 ∝ ln ( C H / τ H ) , respectively, not only for all the present metallic glasses but also for various Zr-base BMG and MMG reported. The characteristic C H dependence of T p and Q p − 1 was attributed to effects of the HISR. The detailed features of the C H dependence of T p and Q p − 1 were discussed in the light of material parameters and HISR.