Langdon, Terence G. (1971) Creep mechanisms in stoichiometric uranium dioxide. Journal of Nuclear Materials, 38 (1), 88-92. (doi:10.1016/0022-3115(71)90011-0).
Abstract
High temperature creep data for stoichiometric polycrystalline uranium dioxide suggest that a dislocation mechanism is probably rate-controlling at high stresses, but at low stress levels deformation occurs by the stress-directed diffusion of vacancies either through the lattice or along the grain boundaries. The creep rates calculated from theoretical models at the low stresses are in reasonable agreement with those observed experimentally, but the diffusion coefficients are not known with sufficient accuracy to determine the diffusional path. By considering the temperature dependence of the creep rate, it appears that diffusion via the grain boundaries may contribute more than ≈ 0.3 of the total creep rate for a material having a grain size of 10 μm tested at 1430 ° C.
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