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

*この研究の対応する著者

研究成果: Article査読

14 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1102-1109
ページ数8
ジャーナルJournal of the American Ceramic Society
87
6
DOI
出版ステータスPublished - 2004 6
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 材料化学

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