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Compressive Creep of Beryllium Oxide‐Uranium Dioxide Mixtures
Author(s) -
VANDERVOORT RICHARD R.,
BARMORE WILLIS L.
Publication year - 1965
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.1151-2916.1965.tb14678.x
Subject(s) - uranium dioxide , beryllium , creep , beryllium oxide , materials science , compressive strength , metallurgy , oxide , composite material , uranium oxide , uranium , chemistry , organic chemistry
Beryllium oxide‐uranium dioxide mixtures were deformed in compression in the region 1375° to 1540°C. The average apparent activation energy for creep of the oxide mixtures containing up to 10 wt% uranium dioxide is 95.1 kcal/mole. The activation energy is not sensitive to the applied stress and does not vary with urania additions. Creep rate is linearly dependent on the applied stress to 6000 psi. At constant stress and temperature, creep rate dependence on grain size for BeO‐10 wt% UO 2 specimens can be described by the relation ɛ∼ 1/2 2 . The creep rate dependence on the applied stress and grain size is consistent with the Nabarro‐Herring mechanism. Creep behavior of the oxide mixtures is ascribed to the deformation of the beryllium oxide matrix.