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