Migration of Cr-vacancy clusters and interstitial Cr in alpha-Fe using the dimer method

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Authors

  • D. Chen
  • F. Gao
  • W.Y. Hu
  • S. Y. Hu
  • Dmitry Terentyev
  • X. Sun
  • H.L. Heinish
  • C.H. Henager
  • M.A. Khaleel

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Abstract

The migration mechanisms and the corresponding activation energies of Cr-vacancy (Cr-V) clusters and Cr interstitials in alpha-Fe have been investigated using the dimer and the nudged elastic-band methods. Dimer searches are employed to find the possible transition states of these defects and the lowest-energy paths are used to determine the energy barriers for migration. A substitutional Cr atom can migrate to a nearest-neighbor vacancy through an energy barrier of 0.56 eV but this simple mechanism alone is unlikely to lead to the long-distance migration of Cr unless there is a supersaturated concentration of vacancies in the system. The Cr-vacancy clusters can lead to long-distance migration of a Cr atom that is accomplished by Fe and Cr atoms successively jumping to nearest-neighbor vacancy positions, defined as a self-vacancy-assisted migration mechanism, with the migration energies ranging from 0.64 to 0.89 eV.

Details

Original languageEnglish
Pages (from-to)064101-064101
JournalPhysical Review B
Volume81
Issue number6
DOIs
Publication statusPublished - 30 Jan 2010

Keywords

  • Fe-Cr, dimer method, point defects, radiation

ID: 258597