Superplasticity in ceramic materials - I. The observation of a "superplastic partition" in ceramics

T. J. Davies, A. A. Ogwu, N. Ridley, Z. C. Wang

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Recent developments in the understanding of the mechanical behaviour of ceramics assessed for superplastic deformation indicate that stoichiometric changes at interfaces and an associated "metallic" behaviour can account for the superplastic behaviour in the absence of a grain boundary glassy phase. Based on the experimental work carried out in Manchester and elsewhere, a "superplastic partition" is observed in ceramics which corresponds to a direct relationship with stoichiometric changes and a related "metallic" behaviour in ceramics. These changes in stoichiometry and the associated "metallic" behaviour can provide mechanisms for resistance to cavity nucleation and propagation, respectively. When this observation is linked with the Gifkins core-mantle concept and the findings of Mott, Cottrell and Gilman on insulator-metal transitions, this yields an improved appreciation of the superplastic partition in ceramics.

Original languageEnglish
Pages (from-to)2373-2382
Number of pages10
JournalActa Materialia
Volume44
Issue number6
DOIs
Publication statusPublished - Jun 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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