Time Scales for Viscous Flow, Atomic Transport, and Crystallization in the Liquid and Supercooled Liquid States of Zr41.2 Ti13.8 Cu12.5 Ni10.0 Be22.5

The shear viscosity of liquid Zr41.2 Ti13.8 Cu12.5 Ni10.0 Be22.5 has been measured. At the liquidus temperature we find an extremely high viscosity of 2.5thinspthinspPathinsps, favoring glass formation. At deep supercooling the time scales for the diffusion of small and medium sized atoms as reported in the literature decouple from the internal relaxation time as probed by our viscosity measurements. Similarly, crystallization from the supercooled liquid state can be described with an effective diffusivity that scales with the viscosity at high temperatures and is Arrhenius-like at deep supercooling. copyright 1999 The American Physical Society