Superplasticity in multi-phase alumina-based composites

A. Foucault, Y. Takigawa, Y. Ikuhara, T. Sakuma

Research output: Contribution to journalArticlepeer-review

Abstract

High-temperature superplasticity in Al2O3-20vol%spinel (MgAl2O4) containing 5,10, 20 and 30vol% of ZrO2 was examined at temperatures between 1400 and 1500°C. The dispersion of ZrO2 significantly reduces the flow stress during tensile tests in comparison with pure Al2O3-20vol%spinel. Flow stress around 10 MPa arc obtained at 1450°C for 20vol% and 30vol%ZrO2 materials and at a strain rate of 1.3×10-4s-1. The flow stress reduction is explained by a decrease in grain growth due to ZrO2 dispersion and by a high increase in diffusion through Do parameter.

Original languageEnglish
Pages (from-to)537-542
Number of pages6
JournalMaterials Science Forum
Volume304-306
DOIs
Publication statusPublished - 1999
Externally publishedYes

Keywords

  • Alumina
  • Ceramics
  • Magnesia spinel
  • Superplasticity
  • Zirconia

ASJC Scopus subject areas

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

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