Accession Number:

ADA136363

Title:

Atomic Transport in Metallic Glasses.

Descriptive Note:

Interim rept.,

Corporate Author:

HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES

Report Date:

1983-11-01

Pagination or Media Count:

39.0

Abstract:

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.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Metallurgy and Metallography
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE