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

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

    Research outputpeer-review


    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.
    Original languageEnglish
    Pages (from-to)064101-064101
    JournalPhysical Review B
    Issue number6
    StatePublished - 30 Jan 2010

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