Strain softening and hardening during superplastic-like flow in a fine-grained MgAl2O4 spinel polycrystal

Koji Morita, Keijiro Hiraga, Byung Nam Kim, Tohru S. Suzuki, Yoshio Sakka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Superplastic-like flow in a fine-grained MgAl2O4 polycrystal exhibits strain softening and hardening, which cannot be ascribed to cavity damage and grain growth during deformation, respectively. The softening and hardening can be related to a change in the internal stress, which depends on a decrease and an increase in the density of the intragranular dislocations, respectively, whose motion contributes to the relaxation of stress concentrations exerted through the predominant deformation mechanism of grain-boundary sliding. In these two regions, the rate of deformation is controlled by the continuous recovery of the dislocations limited by lattice diffusion of the oxygen ions.

Original languageEnglish
Pages (from-to)1102-1109
Number of pages8
JournalJournal of the American Ceramic Society
Volume87
Issue number6
DOIs
Publication statusPublished - 2004 Jun

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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