An MD simulation of interactions between self-interstitial atoms and edge dislocation in bcc transition metals

H. Kamiyama, H. Rafii-Tabar, Yoshiyuki Kawazoe, H. Matsui

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

According to our model on the mechanism of dislocation bias reduction based on the interaction of dumbbell self-interstitial atoms (SIAs) with dislocation, the bias is significantly different depending on the dumbbell configuration in the dislocation strain field. A large-scale molecular dynamics (MD) simulation is performed to reveal the stability and the mechanism of diffusion of dumbbell SIAs near the edge dislocation core in bcc iron. Most SIAs take the crowdion configuration parallel to the Burgers vector in the expansion side of the dislocation. Such crowdions are stable in the temperature range of this simulation, i.e. between 373 and 473 K, making one-dimensional random to-and-fro motion parallel to the dislocation Burgers vector staying at several atomic layers "below" the dislocation core. This means that the SIA does not approach the dislocation core. These results suggest that the stable configuration of SIAs is seriously affected by the dislocation resulting in a reduction of bias factor.

Original languageEnglish
Pages (from-to)231-235
Number of pages5
JournalJournal of Nuclear Materials
Volume212-215
Issue numberPART 1
DOIs
Publication statusPublished - 1994 Jan 1

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'An MD simulation of interactions between self-interstitial atoms and edge dislocation in bcc transition metals'. Together they form a unique fingerprint.

  • Cite this