Internal stress superplasticity in anisotropic polycrystalline zinc and uranium
Internal stress superplasticity is assessed in powder metallurgy and wrought polycrystalline Zn and in polycrystalline ..cap alpha..-U. These materials are anisotropic in their thermal expansion coefficients, and, as a result, internal stresses are generated during thermal cycling. A creep model is developed based on the contribution of internal stress to the enhancement and inhibition of normal plastic flow. This creep model, which has no disposable parameters, is shown to describe quantitatively the flow behavior of anisotropic materials under thermal cycling conditions, and correctly predicts the attainment of Newtonian flow characteristics at low stresses. It is predicted that certain polycrystalline ceramics can be made superplastic in tension when thermally cycled under small applied stress.
- Research Organization:
- Signetics Corp., 811 East Arques Avenue, Sunnyvale, CA (US)
- OSTI ID:
- 6977461
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 18A:3; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101 -- Metals & Alloys-- Preparation & Fabrication
360103* -- Metals & Alloys-- Mechanical Properties
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ACTINIDES
ANISOTROPY
CERAMICS
CREEP
CRYSTALS
ELEMENTS
EXPANSION
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
METALLURGY
METALS
PLASTICITY
POLYCRYSTALS
POWDER METALLURGY
STRESS ANALYSIS
STRESSES
THERMAL CYCLING
THERMAL EXPANSION
THERMAL STRESSES
URANIUM
ZINC