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Fundamental Study to Evaluate Mechanical Property Change Associated to Dislocation Behavior in Irradiated Austenitic Stainless Steels by Incorporating Thermal Fluctuations

[+] Author Affiliations
Keisuke Asari, Satoshi Miyashiro

The University of Tokyo, Tokyo, Japan

Mitsuhiro Itakura

Japan Atomic Energy Agency, Kashiwa, Chiba, Japan

Taira Okita

The University of Tokyo, Kashiwa, Chiba, Japan

Paper No. ICONE21-16428, pp. V006T16A040; 4 pages
doi:10.1115/ICONE21-16428
From:
  • 2013 21st International Conference on Nuclear Engineering
  • Volume 6: Beyond Design Basis Events; Student Paper Competition
  • Chengdu, China, July 29–August 2, 2013
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5583-6
  • Copyright © 2013 by ASME

abstract

Molecular dynamics simulations were conducted with three interatomic potentials for face-centered cubic (FCC) metals with different stacking fault energies (SFEs), and the effect of the SFE on the dislocation behaviors was evaluated by incorporating thermal fluctuation. The separation distance between two partial dislocations fluctuated and was changed locally by thermal vibration, and the fluctuation increased with temperature. For a low-SFE metal, thermal vibration can hardly induce reversions into a perfect dislocation. This causes a characteristic morphology for interactions between a line dislocation and irradiation-induced defects for austenitic stainless steels.

Copyright © 2013 by ASME

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