Diffusion fluxes and creep of polycrystalline compounds: Application to alumina

Journal Article · Sat May 15 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90455-2· OSTI ID:6786723

Dominguez-Rodriquez, A ^[1]; Castaing, J ^[2]

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1. ICMSE-CSIC, Sevilla (Spain)
2. Univ. d'Evry val d'Essonne, Bellevue (France)

The high temperature deformation of materials is the consequence of the transport of matter depending on the diffusion of the elements constituting the compounds. This is valid for a number of mechanisms such as pure diffusional creep, grain switching and dislocation deformation, which have been described by many models. Many workers have reviewed the creep and diffusion behavior of ceramic oxides. They all believed that the compounds did not undergo any change in composition during deformation. This was pointed out in the work of Jimenez-Melendo et al. who examined the creep of NiO polycrystals and showed that the lattice and grain-boundary (GB) diffusion could be combined in two ways, one avoiding any variation of composition and the other one permitting fluctuations within the specimens. In this paper, the authors show that in the case of alumina, the widely accepted assumption should not be used and that by taking the flux coupling avoiding local composition variations, they can best fit the creep model with the experimental data.

• OSTI ID: 6786723
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 28:10; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CREEP
CRYSTAL STRUCTURE
CRYSTALS
DEFORMATION
DIFFUSION
GRAIN BOUNDARIES
IMPURITIES
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
STOICHIOMETRY