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Creep of Beryllia Single Crystals
Author(s) -
Corman Gregory S.
Publication year - 1992
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.1151-2916.1992.tb05444.x
Subject(s) - creep , materials science , anisotropy , slip (aerodynamics) , composite material , crystallography , thermodynamics , chemistry , optics , physics
The compressive creep behavior of single‐crystal BeO was studied under inert atmosphere. The steady‐state creep behavior was highly anisotropic because of easily activated basal slip. Crystals compressed along a [1101] axis deformed at temperatures as low as 650°C, whereas [1100]‐aligned crystals showed comparable strain rates at temperatures 1650°C. The measured activation energies and stress exponents for creep were 371 kJ/mol and 4.65 for the [1101] alignment and 496 kJ/mol and 3.39 for the [1100] alignment, respectively. The precise mechanisms controlling creep behavior were not determined. Only one semiquantitative data point was obtained for the [0001] alignment, which indicates that the creep rate at 100 MPa and 1750°C is less than that for c ‐axis sapphire.