On the origin of radiation growth of hcp crystals

Golubov, Stanislav I. ; Barashev, Aleksandr ; Stoller, Roger E.

Oak Ridge National Laboratory

关键词: Origin;    Alloys;    Irradiation;    75 Condensed Matter Physics, Superconductivity And Superfluidity;    Strain Rate;   

DOI  :  10.2172/1037031
RP-ID  :  ORNL/TM-2011/473
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  1037031

美国|英语

来源: UNT Digital Library

【 摘 要 】

The aim of the present work is to study theoretically the radiation growth (RG) of hcp-type materials with a particular focus on the effect of one-dimensionally (1-D) migrating clusters of self-interstitial atoms (SIAs), which are steadily produced in displacement cascades under neutron or heavy-ion irradiation. A reaction-diffusion model is developed for the description of RG in single hcp-type metallic crystals. The model reproduces all RG stages observed in neutron-irradiated annealed samples of pure Zr and Zr alloys, such as high strain rate at low, strain saturation at intermediate and breakaway growth at relatively high irradiation doses. In addition, it accounts for the striking observations of negative strains in prismatic directions and coexistence of vacancy- and SIA-type prismatic loops. The role of cold work in RG behavior and alignment of the vacancy-type loops along basal planes are revealed and the maximum strain rate is estimated.