Ribbons of the metallic glass were cold-rolled to a reduction of about 25%. As-quenched and cold-rolled samples were then cathodically charged in 1N H2SO4. It was observed that the H embrittlement susceptibility was enhanced by cold-rolling. The ductility recovery kinetics were then used to estimate the H diffusivity (figure 23). The results indicated an increase in H diffusivity due to deformation.

R.D.K.Misra, D.Akhtar: Materials Research Bulletin, 1986, 21[12], 1473-9

Figure 23

Diffusivity of H in Ni60Nb40

(open squares: cold-rolled, filled squares: as-quenched)