Enhanced mass transport in titanium carbide at large departures from stoichiometry

M. P. Dariel, O. Klein, N. Frage

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Significantly enhanced mass-transport related effects such as sintering and grain growth have been reported at large departures from stoichiometry in titanium carbide. The diffusivities of both C and Ti in this compound are coupled and the rate of mass transport is determined by the lower mobility of Ti. Quantitative grain-growth measurements of samples with different C/Ti ratios confirmed the large mass transport effects at low carbon content. A model based on the statistical distribution of vacant carbon sites in the immediate environment of the Ti atoms was put forward in order to account for the greatly enhanced diffusivity of Ti at low values of the C/Ti ratio. The dominant determining factor at that ratio is the reduced enthalpy of formation of Ti vacancies in the absence of nearest neighbor carbon atoms. The composition dependence of the observed grain growth is in reasonable agreement with the predictions of the model.

Original languageEnglish
Pages (from-to)460-467
Number of pages8
JournalPowder Metallurgy and Metal Ceramics
Volume42
Issue number9-10
DOIs
StatePublished - 1 Sep 2003

Keywords

  • Diffusion
  • Grain growth
  • TiC carbides

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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