Ribbons of the metallic glass were embrittled by cathodic charging with H to 2 different concentrations. The recovery of the ductility of the embrittled glass was monitored by H de-gassing at various temperatures. The data obtained were used to estimate the H diffusion coefficient (figure 24). It was shown that the diffusivity depended upon the initial concentration. However, no concentration effect upon the diffusion activation energy was detected.

R.D.K.Misra, D.Akhtar: Materials Research Bulletin, 1986, 21[5], 593-9

Figure 24

Diffusivity of H in Ni60Nb35Cr5

(open squares: 3at%H, filled squares: 1.6at%H)