The temperature dependence of tracer diffusivity in the 3-component system was measured. In the case of Ni23Zr62Al15, it was possible to measure diffusion coefficients below and above the glass transition temperature. As in the binary metallic glass, NiZr, the diffusion coefficient was strongly dependent upon the atomic size of the tracer, and varied by 2 orders of magnitude. The results suggested a collective diffusion mechanism in bulk metallic glasses. Radiation-enhanced diffusion was also measured in this alloy and was compared with measurements of radiation-induced viscous flow in similar alloys.

Thermal and Radiation-Enhanced Diffusion in the Bulk Metallic Glass Ni23Zr62Al15. S.Flege, H.Hahn, R.S.Averback: Physical Review B, 2004, 69[1], 014303 (7pp)