Diffusive growth of grain-boundary cavities
A simple theoretical approach to the general problem of diffusive growth of grain boundary cavities of both equilibrium and non-equilibrium shape in the presence of power law creep is devloped. It is shown that the modified rigid-grain solution which incorporates a creep-coupled diffusion distance can satisfactorily prescribe the volumetric growth of cavities under creep conditions. The corresponding surface flux at the cavity walls compatible with the volumetric growth in turn determines the degree of non-equilibrium in the shape of the cavity. Two modes of growth, the quasi-equilibrium one and the crack-like one, are predicted, so is a minimum in the normalized growth rate. The combined effect of the creep and the non-equilibrium shape is likely to cause rupture at a strain which slowly decreases with the decreasing strain rate. 7 figures.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge
- OSTI ID:
- 6340199
- Journal Information:
- Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 29; ISSN AMETA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
CAVITATION
CREEP
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
FRACTURE MECHANICS
GRAIN BOUNDARIES
IRON
IRON-ALPHA
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
METALLOGRAPHY
METALS
MICROSTRUCTURE
STRAINS
TIME DEPENDENCE
TRANSITION ELEMENTS