Plastic Deformation of Fine-Grained Alumina (Al2O3): I, Interface-Controlled Diffusional Creep

Autor:	Arthur H. Heuer, W. H. Rhodes, Rowland M. Cannon
Rok vydání:	1980
Předmět:	Dislocation creep Materials science Diffusion creep Slip (materials science) Grain size Physics::Geophysics Crystallography Deformation mechanism Creep Materials Chemistry Ceramics and Composites Grain boundary Composite material Deformation (engineering)
Zdroj:	Journal of the American Ceramic Society. 63:46-53
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1980.tb10648.x
Popis:	Plastic deformation in fine-grained alumina polycrystals (grain size 1 to 15 μm) was studied. At least three distinct deformation mechanisms are important: diffusional creep, basal slip, and unaccommodated grain-boundary sliding. The first and most important of these processes is addressed in this paper. Analysis of the deformation dynamics suggests that both lattice and grain-boundary diffusion are important in the diffusional creep. Aluminum, rather than oxygen, lattice and grain-boundary diffusion are rate-controlling because oxygen diffusion is very slow in the lattice but very rapid in grain boundaries. Significantly, the diffusional creep can become interfacecontrolled at low stresses, causing the often-reported non-Newtonian creep behavior of fine-grained alumina.
Databáze:	OpenAIRE
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