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Creep Deformation of 0° Sapphire
Author(s) -
FIRESTONE R. F.,
HEUER A. H.
Publication year - 1976
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1976.tb09379.x
Subject(s) - creep , climb , materials science , sapphire , slip (aerodynamics) , burgers vector , dislocation , dislocation creep , composite material , transmission electron microscopy , deformation mechanism , deformation (meteorology) , diffusion creep , stress (linguistics) , optics , microstructure , grain boundary , thermodynamics , nanotechnology , physics , laser , linguistics , philosophy
Creep deformation of 0° sapphire was studied between 1600°and 1800°C at stresses up to 114 MN/m 2 . Microscopical evidence (dislocation structures observed by transmission electron microscopy (TEM) and by etch pits) suggested that Nabarro climb was the predominant deformation mechanism. Both the experimental creep rates and stress exponents were in good agreement with those predicted by this model. Although non‐basal dislocations with a ½〈101〉 Burgers vector were present, the good creep resistance of 0° sapphire was attributed to the difficulty of activating pyramidal slip.