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Competing influence of vacancies and interstitial atoms on temperature dependence of creep under irradiation
Author(s) -
Selyshchev P.,
Sugakov V.
Publication year - 2013
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12083
Subject(s) - climb , creep , materials science , irradiation , thermal , condensed matter physics , thermodynamics , composite material , nuclear physics , physics
In the framework of the Orowan model, a theoretical approach is developed to explain the appearance of a break (local minimum and maximum) on a curve of creep rate dependence on temperature of materials under irradiation. The break is explained by competition of radiation and thermal defect fluxes to dislocations. At some temperature, the fluxes of interstitial atoms and vacancies become equal and compensate each other. Thus, the dislocations do not climb. Climb–glide mechanism does not contribute to the creep and the creep decreases. It is shown that the presence of sinks with different preference coefficients is necessary for the appearance of the break. Theoretical and experimental results are in good agreement.