Diffusion and conversion of interstitial dumbbells in segregated ternary alloys under irradiation

Oleksandr Shepelyev, Naoto Sekimura, Hiroaki Abe

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

A radiation-induced segregation model for concentrated alloys based on the inverse Kirkendall effect is successfully used to predict element segregation in model alloys under irradiation conditions. In this model the segregation is the result of preferential atom-vacancy jumps. But under conditions of high irradiation flux or wide temperature range, a description of interstitial migration must be included in the model. In the present work the rate theory was used to simulate radiation-induced segregation near the grain boundary in Fe-Cr-Ni alloys. A model of diffusion and conversion of a mixed interstitial dumbbell was applied to describe the flux of interstitial. Six types of interstitial dumbbells and their conversion by a jump of one of its constituent atoms to a neighbouring site to form a dumbbell of different orientation, were considered. The vacancy flux was described similarly to the Wiedersich-Okamoto- Lam model, considering its migration through position exchange with a lattice atom.

Original languageEnglish
Pages (from-to)1204-1207
Number of pages4
JournalJournal of Nuclear Materials
Volume329-333
Issue number1-3 PART B
DOIs
Publication statusPublished - 2004 Aug 1
EventProceedings of the 11th Conference on Fusion Research - Kyoto, Japan
Duration: 2003 Dec 72003 Dec 12

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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