Atomic Transport in Metallic Glasses.
HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES
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The viscosity of glassy Pd77.5Cu6Si16.5 near Tg has bimolecular relaxation kinetics. A new determination of the equilibrium is reported, which is an order of magnitude higher than literature values. The iso-configurational temperature dependence is found to depend on thermal history. Diffusion measurements in compositionally modulated films have been made. Reported here are iso-configurational diffusivities, relaxation kinetics, and modulation wavelength dependence. The existence of a gradient energy coefficient in metallic glasses has been established. The diffusivity is about two orders of magnitude higher than the predictions of the Stokes-Einstein relation from the viscosity.
- Ceramics, Refractories and Glass
- Metallurgy and Metallography
- Atomic and Molecular Physics and Spectroscopy