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Microstructural examination in high-strain-rate superplastically deformed tetragonal ZrO2 dispersed with 30 vol% MgAl2O4 spinel

Published online by Cambridge University Press:  03 March 2011

Koji Morita ,
Keijiro Hiraga ,
Byung-Nam Kim  and
Yoshio Sakka
Koji Morita*
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Keijiro Hiraga
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Byung-Nam Kim
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
Yoshio Sakka
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
*
a)Address all correspondence to this author. e-mail: MORITA.Koji@nims.go.jp
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Abstract

The role of MgAl2O4 spinel particle dispersion for attaining high-strain-rate superplasticity (HSRS) was examined in tetragonal ZrO2. Microstructural examination shows that the dispersed spinel particles provide the following positive factors to ZrO2 simultaneously: (i) stable fine grain size by retarding grain growth due to pinning effect; and (ii) enhanced accommodation due to accelerated lattice diffusivity caused by the dissolution of aluminum and magnesium into ZrO2 from the spinel particles, and accelerated relaxation of stress concentrations exerted by grain boundary sliding through dislocation motion. These positive factors make it possible to attain HSRS in ZrO2.

Keywords

CeramicMicrostructureSuperplasticity
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 3 , March 2007 , pp. 801 - 813
Copyright
Copyright © Materials Research Society 2007

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