On the Origin of Radiation Growth of HCP Crystals

Technical Report · Tue Nov 01 00:00:00 EDT 2011

DOI:https://doi.org/10.2172/1037031· OSTI ID:1037031

Golubov, Stanislav I. ^[1]; Barashev, Aleksandr V. ^[2]; Stoller, Roger E. ^[1]

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1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
2. Univ. of Liverpool (United Kingdom); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE), Nuclear Energy Advanced Modeling and Simulation (NEAMS)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1037031
• Report Number(s): ORNL/TM--2011/473; NT0304000; NEAF343
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALIGNMENT
ALLOYS
ATOMS
HCP LATTICES
IRRADIATION
NEUTRONS
ORIGIN
RADIATIONS
SATURATION
STRAIN RATE
STRAINS