Creep and Relaxation behavior of Vapor-Deposited Amorphous Selenium Films: Flow behavior of Glassy Metals.
Abstract
It has been shown that a-Se films deposited from the vapor onto low temperature substrates, when annealed at or just below their glass temperatures, become indistinguishable, in flow and transformation behavior, from melt-quenched specimens. Photoillumination, in the visible range, of these films (a) sharply increases their rate of approach to configurational equilibrium while not affecting the flow rate of equilibrium, (b) greatly increases the number density of crystals heterogeneously nucleated while not producing measurable homogeneous nucleation, (c) generally increases the rates of growth of crystals within the films. It has been shown that the plastic deformation behavior of glassy metals can be represented satisfactorily by a deformation map of the type presented by Ashby and Frost for various crystalline materials. The available evidence indicates that the temperature dependence of the isoconfigurational creep rate below the glass temperature is relatively much smaller for metallic alloy than for non-metallic glasses. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 06, 1976
- Accession Number
- ADA041111
Entities
People
- David Turnbull
Organizations
- Harvard University