Application of the model of delocalized atoms to metallic glasses

• Published in: Technical physics Vol. 62; no. 1; pp. 53 - 57
• Main Authors: Sanditov, D. S., Darmaev, M. V., Sanditov, B. D.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2017; Springer; Springer Nature B.V
• Subjects: Activation energy; Amorphous alloys; Amorphous materials; Classical and Continuum Physics; Glass transition; Ion diffusion; Metallic glasses; Physics; Physics and Astronomy; Solid State; Temperature dependence; Viscous flow
• ISSN: 1063-7842; 1090-6525
• DOI: 10.1134/S1063784217010200

The parameters of the model of delocalized atoms applied to metallic glasses have been calculated using the data on empirical constants of the Vogel–Fulcher–Tammann equation (for the temperature dependence of viscosity). It has been shown that these materials obey the same glass-formation criterion as amorphous organic polymers and inorganic glasses. This fact qualitatively confirms the universality of the main regularities of the liquid–glass transition process for all amorphous materials regardless of their origin. The energy of the delocalization of an atom in metallic glasses, Δε
e
≈ 20–25 kJ/mol, coincides with the results obtained for oxide inorganic glasses. It is substantially lower than the activation energies for a viscous flow and for ion diffusion. The delocalization of an atom (its displacement from the equilibrium position) for amorphous metallic alloys is a low-energy small-scale process similar to that for other glass-like systems.