Channeling measurements of the trapping efficiencies of solute atoms for self-interstitial atoms in metals

Channeling techniques were used to measure the concentration of mixed dumbbells as a function of irradiation fluence in crystals of Al-0.10 at.% Ag, Cu-0.25 at.% Be and Mg-0.18 at.% Ag. From the experimentally observed production rates of mixed dumbbells from alpha or deuteron irradiations at temperatures where self-interstitials were mobile, it was concluded that the dominant trapping configuration was the mixed dumbbell. In the case of the AI-0.10 at.% Ag alloy, mixed dumbbell trapping dominated at irradiation temperatures of both 70 and 150 K. The ratio of trapping efficiency ev , of vacancies for interstitials to the trapping efficiency ed of solute atoms for interstitials was ev/ed = 5 ± 2 in all cases.