Indentation Creep in Zirconia Ceramics Between 290 K and 1073 K

  • J. L. Henshall
  • G. M. Carter
  • R. M. Hooper

Abstract

The results are reported of a study of the temperature and time response of yttria stabilised cubic zirconia, both in polycrystalline and single crystal form, to Knoop indentations in the ranges 290–1073 K and 10–10 000 s. The single crystal data lie consistently above the polycrystalline results. Indentation creep is observed at all temperatures with the rate of creep increasing at higher temperatures. The results are analysed and discussed in terms of the available models of indentation creep. A transition in deformation mechanism occurs at approximately 650 K for both materials. The activation energies and stress exponents were determined as 36 and 273 kJ/mol, and 40 and 20 for the single crystal, and 109 and 247 kJ/mol, and 53 and 29 for the polycrystalline below and above 600 K, respectively. At the higher temperatures, deformation is pipe diffusion dislocation climb controlled, whilst at the lower temperatures dislocation glide is the rate determining process.

Keywords

Stress Exponent Indentation Hardness Indentation Creep Zirconia Ceramic Knoop Hardness 
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Copyright information

© Elsevier Science Publishers Ltd 1989

Authors and Affiliations

  • J. L. Henshall
    • 1
  • G. M. Carter
    • 1
  • R. M. Hooper
    • 1
  1. 1.School of EngineeringUniversity of ExeterExeterUK

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