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Prismatic slip of A12O3 single crystals below 1000°C in compression under hydrostatic pressure

January 16, 1981

Alumina single crystals were compressed perpendicular to the [0001] axis at a constant strain rate between 20° and 950°C. At r>200°C, failure was suppressed by_hydrostatic pressures of 500 to 1500 MPa. Prismatic slip {1120}〈1100〉 was deduced from optical observations of the lateral surfaces and from stress‐optical features in thin sections cut from the specimens. The critical resolved shear stress (CRSS) decreased rapidly with increasing temperature, from a maximum of ∼3000 MPa at 200°C (strain rate 2±10‐−5 s−1). A simple linear law can be fitted with the logarithm of the CRSS as a function of temperature, up to 1800°C. The rate‐controlling mechanism for dislocation glide is likely to be either the Peierls barrier or barriers due to dissociation out of the glide plane.

Citation Information

Publication Year 1981
Title Prismatic slip of A12O3 single crystals below 1000°C in compression under hydrostatic pressure
DOI 10.1111/j.1151-2916.1981.tb10314.x
Authors J. Castaing, J. Cadoz, Stephen H. Kirby
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of the American Ceramic Society
Series Number
Index ID 70207868
Record Source USGS Publications Warehouse
USGS Organization Earthquake Science Center

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