Solute segregation to voids during irradiation

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Abstract
Substitutional solute segregation to a void surface during irradiation has been calculated by means of a kinetic model previously used to study segregation to the surfaces of thin foils. The results are qualitatively similar to those for the foils with respect to temperature, defect-production rate, internal sink density, and defect-solute binding energy. However, the segregation effect varies in magnitude with void size and void number density. Solute enrichment at the void surface is negligible for quite small voids, increases to a maximum, and then decreases to the thin-foil limit for large voids, whereas solute depletion at the midpoint between voids monotonically rises to a saturation value as the void radius increases. The maximum enrichment can be many times greater than the foil value. The present calculations may not only be useful in understanding radiation-induced segregation behavior but may also be helpful in providing information with which to interpret several related phenomena such as void formation and radiation-induced precipitation.

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