The self-diffusion of Ni in bulk metallic glass samples was measured, at 538 to 720K, by using an ion-beam sputter-sectioning technique. It was found that the temperature dependence of the diffusivity in the supercooled liquid phase was very different to that in the amorphous phase below the glass transition temperature. The diffusivity in the supercooled liquid phase was much higher than that extrapolated from the amorphous-phase data (figure 26). This enhancement was attributed to an increase in the temperature-dependent configuration entropy in the supercooled liquid phase.

Ni Tracer Diffusion in Bulk Metallic Glass Zr55Al10Ni10Cu25. H.Nakajima, K.Nonaka, T.Kojima, T.Zhang, A.Inoue: Materials Science Forum, 1999, 304-306, 367-72

Figure 26

Diffusivity of Ni in Zr55Cu25Al10Ni10