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Title: Defect structures induced by high-energy displacement cascades in γ uranium

Displacement cascade simulations were conducted for the c uranium system based on molecular dynamics. A recently developed modified embedded atom method (MEAM) potential was employed to replicate the atomic interactions while an embedded atom method (EAM) potential was adopted to help characterize the defect structures induced by the displacement cascades. The atomic displacement process was studied by providing primary knock-on atoms (PKAs) with kinetic energies from 1 keV to 50 keV. The influence of the PKA incident direction was examined. The defect structures were analyzed after the systems were fully relaxed. The states of the self-interstitial atoms (SIAs) were categorized into various types of dumbbells, the crowdion, and the octahedral interstitial. The voids were determined to have a polyhedral shape with {110} facets. The size distribution of the voids was also obtained. The results of this study not only expand the knowledge of the microstructural evolution in irradiated c uranium, but also provide valuable references for the radiation-induced defects in uranium alloy fuels.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1]
  1. Univ. of Illinois, Urbana, IL (United States) Dept. of Nuclear and Radiological Engineering
  2. Univ. of Illinois, Urbana, IL (United States) Dept. of Mechanical and Aerospace Engineering
  3. Georgia Inst. of Technology, Atlanta, GA (United States) Dept. of Nuclear and Radiological Engineering
  4. Mississippi State Univ., Mississippi State, MS (United States) Dept. of Aerospace Engineering; Los Alamos National Lab. (LANL), Los Alamos (United States); Univ. of California, San Diego, CA (United States). Dept. of Mechanical and Aerospace Engineering
  5. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
1162226
Report Number(s):
INL/JOU--14-33541
Journal ID: ISSN 0022-3115; TRN: US1500181
DOE Contract Number:
AC07-05ID14517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 456; Journal Issue: C
Publisher:
Elsevier
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; NUCLEAR FUELS; IRRADIATION; KNOCK-ON; MICROSTRUCTURE; SHAPE; COMPUTERIZED SIMULATION; URANIUM-GAMMA; DEFECTS; ATOMS; URANIUM ALLOYS; MOLECULAR DYNAMICS METHOD; KEV RANGE 01-10; KEV RANGE 10-100; POTENTIALS; VOIDS; DISTRIBUTION; ATOMIC DISPLACEMENTS; INTERSTITIALS; SIZE; DISTRIBUTION