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

Abstract

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{sub 2}-dispersed Al{sub 2}O{sub 3}.

Authors:
; ; ;
Publication Date:
Research Org.:
National Research Inst. for Metals, Tsukuba, Ibaraki (JP)
OSTI Identifier:
20000485
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 47; Journal Issue: 12; Other Information: PBD: 29 Sep 1999; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GRAIN GROWTH; DEFORMATION; ZIRCONIUM OXIDES; ALUMINIUM OXIDES; MATHEMATICAL MODELS; DIFFUSION; GRAIN BOUNDARIES; STRAIN RATE; TEMPERATURE DEPENDENCE

Citation Formats

Kim, Byung-Nam, Hiraga, Keijiro, Sakka, Yoshio, and Ahn, Byung-Wook. A grain-boundary diffusion model of dynamic grain growth during superplastic deformation. United States: N. p., 1999. Web. doi:10.1016/S1359-6454(99)00201-3.
Kim, Byung-Nam, Hiraga, Keijiro, Sakka, Yoshio, & Ahn, Byung-Wook. A grain-boundary diffusion model of dynamic grain growth during superplastic deformation. United States. https://doi.org/10.1016/S1359-6454(99)00201-3
Kim, Byung-Nam, Hiraga, Keijiro, Sakka, Yoshio, and Ahn, Byung-Wook. 1999. "A grain-boundary diffusion model of dynamic grain growth during superplastic deformation". United States. https://doi.org/10.1016/S1359-6454(99)00201-3.
@article{osti_20000485,
title = {A grain-boundary diffusion model of dynamic grain growth during superplastic deformation},
author = {Kim, Byung-Nam and Hiraga, Keijiro and Sakka, Yoshio and Ahn, Byung-Wook},
abstractNote = {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{sub 2}-dispersed Al{sub 2}O{sub 3}.},
doi = {10.1016/S1359-6454(99)00201-3},
url = {https://www.osti.gov/biblio/20000485}, journal = {Acta Materialia},
issn = {1359-6454},
number = 12,
volume = 47,
place = {United States},
year = {Wed Sep 29 00:00:00 EDT 1999},
month = {Wed Sep 29 00:00:00 EDT 1999}
}