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 Al-0.10 at. % Ag alloy, mixed dumbbell trapping dominated at irradiation temperatures of both 70 and 150 K. The ratio of trapping efficiency esub(v) of vacancies for interstitials to the trapping efficiency esub(d) of solute atoms for interstitials was esub(v)/esub(d) = 5 +- 2 in all cases. (author)