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(55)Cu(30)AI(10)Ni(5) (numbers indicate at.%) (MG), a-Zr54CU30Al10Ni5Sil (MMG) and a-Zr40Cu49Al10Si1 (MMG) were studied. It is found that the T-p versus Q(p)(-1) data and the Q(P)(-1) versus C-H data are well explained by the relationships of T-p = Delta T-p exp(-C-H/tau(H)) + T-p,T-0 and Q(P)(-1) alpha(C-H/tau(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. (c) 2006 Elsevier B.V. All rights reserved.