Abstract
Recent and current work has shown that self- and substitutional diffusion in α-Zr is enhanced by the presence of the ultra-fast, interstitially-diffusing solute, Fe. The bulk of the data indicates that the diffusion coefficients scale directly with the Fe concentration. This work considers the nature of the Fe-enhancement mechanism in terms of vacancies strongly bound to either substitutional or interstitial Fe atoms. Experimental evidence from diffusion experiments, as well as from electron microscopy and positron annihilation spectroscopy investigations, is considered. It is concluded that the experimentally observed substitutional diffusion enhancements are most readily interpreted in terms of transport via an interstitial Fe/vacancy pair.
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