A grain-boundary diffusion model of dynamic grain growth during superplastic deformation

Dynamic grain growth during superplastic deformation is modelled on the basis of a grain-boundary diffusion mechanism. On the grain boundary where a static and a dynamic potential difference coexist, matter transport along the boundary is assumed to contribute to dynamic grain growth through deposit...

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Bibliographic Details
Published in:Acta materialia 1999-09, Vol.47 (12), p.3433-3439
Main Authors: Kim, Byung-Nam, Hiraga, Keijiro, Sakka, Yoshio, Ahn, Byung-Wook
Format: Article
Language:English
Subjects:
ALUMINIUM OXIDES
Ceramics (structural)
Condensed matter: structure, mechanical and thermal properties
DEFORMATION
Deformation and plasticity (including yield, ductility, and superplasticity)
DIFFUSION
Diffusion (interface)
Exact sciences and technology
GRAIN BOUNDARIES
GRAIN GROWTH
MATERIALS SCIENCE
MATHEMATICAL MODELS
Mechanical and acoustical properties of condensed matter
Mechanical properties (plastic)
Mechanical properties of solids
Physics
STRAIN RATE
TEMPERATURE DEPENDENCE
ZIRCONIUM OXIDES
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Summary:Dynamic grain growth during superplastic deformation is modelled on the basis of a grain-boundary diffusion mechanism. On the grain boundary where a static and a dynamic potential difference coexist, matter transport along the boundary is assumed to contribute to dynamic grain growth through depositing the matter on the grain surface located opposite to the direction of grain-boundary migration. The amount of the diffusive matter during deformation is calculated for an aggregate of spherical grains and is converted to the increment of mean boundary migration velocity. The obtained relationship between the strain rate and the dynamic grain growth rate is shown to be independent of deformation mechanisms, provided that the grain growth is controlled by grain-boundary diffusion. The strain dependence, strain-rate dependence and temperature dependence of grain growth predicted from this model are consistent with those observed in superplastic ZrO 2-dispersed Al 2O 3.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(99)00201-3