We have performed molecular dynamics simulations of self-interstitial atom diffusion in pure {α}-Fe and in a dilute Fe--1.0-at. % Cu alloy. We find that the presence of this oversized substitutional solute significantly alters the self-interstitial diffusion properties. We explain this through a mechanism directly based on the atomic strain field interactions between the Cu and the self-interstitial atom.
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Marian et al. (2001) studied this question.
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