Abstract
Experimental results are presented which show that ordered void arrays are formed in Nb or in Nb-1 at.% Zr alloy during 3.2-MeV Ni + or V + irradiation only if the oxygen-impurity concentration exceeds a threshold amount. Empirical and theoretical equations are presented that define the relationship between the ordered void lattice constant, void dimension, irradiation temperature and oxygen-impurity concentration. These results suggest that the void spacing in ordered arrays is basically due to interstitial solute segregation to void surfaces.
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