Computer simulations were made of the molten alloy at temperatures down to the glass transition. Analysis of the atomic displacements revealed 2 processes. One was the hopping of atoms over nearest-neighbor distances. The other was a more flux-like motion which was very similar for both Cu and Zr atoms. The jumps became increasingly reversible with decreasing temperature, and their contribution to long-range diffusion decreased. It was noted that, whereas the jump-rates obeyed the Arrhenius law, the rapid drop in diffusion resulted from an increased reversibility.

Diffusion Mechanisms in Under-Cooled Binary Metal Liquids of Zr67Cu33 C.Gaukel, H.R.Schober: Solid State Communications, 1998, 107[1], 1-5