Accession Number : ADA136363

Title :   Atomic Transport in Metallic Glasses.

Descriptive Note : Interim rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES

Personal Author(s) : Cammarata,R C ; Greer,A L ; Spaepen,F ; Tsao,S S

PDF Url : ADA136363

Report Date : Nov 1983

Pagination or Media Count : 39

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.

Descriptors :   *Palladium alloys, *Amorphous materials, *Glass, *Kinetics, Copper alloys, Silicon alloys, Viscosity, Transition temperature, Atomic energy levels, Relaxation, Diffusion, Gradients, Molecular structure

Subject Categories : Ceramics, Refractories and Glass
      Metallurgy and Metallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE