Nonbasal Slip in Alumina at High Temperatures and Pressures

  • A. H. Heuer
  • R. F. Firestone
  • J. D. Snow
  • J. Tullis
Part of the Materials Science Research book series (MSR, volume 5)


Czochralski (0°) sapphire has been deformed in tensile creep at 1600–1800°C., and fine-grained alumina polycrystals have been deformed under hydrostatic confining pressure at 1000–1200°C., in order to activate nonbasal deformation modes. The tensile creep data is in agreement with Nabarro-climb, although evidence for pyramidal slip on the {1102} planes was also observed. Either of these deformation modes, in conjunction with basal and prismatic plane slip, permit general deformation of polycrystalline specimens. In addition, “water weakening” was observed to occur in the deformation of polycrystalline alumina under hydrostatic confining pressures.


Slip System Critical Resolve Shear Stress Basal Slip Pyramidal Slip Tensile Creep 
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Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • A. H. Heuer
    • 1
  • R. F. Firestone
    • 1
  • J. D. Snow
    • 2
  • J. Tullis
    • 3
  1. 1.Case Western Reserve UniversityClevelandUSA
  2. 2.Ferro CorporationClevelandUSA
  3. 3.University of California at Los AngelesLos AngelesUSA

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