Self-interstitial diffusion in alpha-iron was investigated using an embedded-atom-method potential and molecular dynamics simulations. A curved Arrhenius plot was obtained for the temperature dependence of diffusion coefficients, which was well explained by the superposition of two transition processes among the two allotropie states of self-interstitial defects, the reformation of <110> dumb-bell into another <110> configuration and one-dimensional solitonic propagation of a crowdion on <111> axis.

Molecular-Dynamics Study of Self-Interstitial Diffusion in BCC-Iron. Kusunoki, K., Tabuchi, M.: Journal of the Japan Institute of Metals, 2008, 72[1], 39-42