Interaction of slip with grain boundary and its role in cavity nucleation
Localized stress evolution resulting from interaction of slip with a grain boundary is characterized by a superposition of the internal loading of a subsystem by dynamic dislocation pile ups and the diffusional relaxation along the grain boundary. The probability of cavity nucleation per stress pulse is evaluated. The nominal efficiency of a grain boundary as a vacancy source and sink is related to the climb mobility of grain boundary dislocations. The critical stress for cavity nucleation (a Hall-Petch type relationship) is related to the effective slip length. The frequency of slip/grain-boundary interaction and continuous cavity nucleation during creep are discussed by comparing theoretical predictions with experimental data.
- Research Organization:
- Metals and Ceramics Div., Oak Ridge National Lab., Oak Ridge, TN (US)
- OSTI ID:
- 7171828
- Journal Information:
- Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 34:12; ISSN AMETA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602 -- Other Materials-- Structure & Phase Studies
360603* -- Materials-- Properties
CALCULATION METHODS
CAVITIES
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
DISLOCATIONS
DYNAMIC LOADS
GRAIN BOUNDARIES
LINE DEFECTS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUCLEATION
SLIP
STRESS ANALYSIS
STRUCTURAL CHEMICAL ANALYSIS