Plastic deformation of ductile ceramics in the Al2TiO5-MgTi2O5 system

T. Shimazu, M. Miura, N. Isu, T. Ogawa, K. Ota, H. Maeda, Hideki Ishida

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Ceramics are typically rigid and brittle. If this brittleness could be overcome, their application can be widely expanded. Itacolumite is known as a highly flexible unique rock in the sandstone group. The microstructure of itacolumite has many narrow gaps at the grain boundaries; these gaps allow a slight displacement of the particles, and the rock can plastically bend when stressed. The authors tried to develop highly ductile ceramics by mimicking itacolumite, which resulted in the Al2TiO5-MgTi2O5 solid solution ceramics. These ceramics have a high ductility and good stress relaxation properties against flexure stress because there are many thin gaps along the grain boundaries formed by discontinuous grain growth during the sintering process and anisotropic thermal expansion during the cooling process. The ductility is caused by the integration of a slight displacement of the grains. This phenomenon was observed as a high-internal friction, reflecting the total friction of a high-grain boundary area.

Original languageEnglish
Pages (from-to)340-346
Number of pages7
JournalMaterials Science and Engineering A
Volume487
Issue number1-2
DOIs
Publication statusPublished - 2008 Jul 25

Keywords

  • Bending strain
  • Discontinuous grain growth
  • Grain boundary
  • Internal friction
  • Microcrack
  • Plastic deformation
  • Porous ceramics

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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