[en] Specimens of Al, Al--Mg, and Pt were irradiated using the Davis d-Be neutron source which has a spectrum peaking at approx. 15 MeV. Lifetime and Doppler-broadening measurements have been made on these specimens for three fluences in the as-irradiated state and for subsequent anneals to 500⁰C. Saturation of positron trapping at the higher fluences was observed in the Pt specimen, with the average trap size increasing after annealing through stage III (vacancy migration). Surviving traps after 500⁰C are presumed to be voids. The Al and Al--Mg showed some trapping introduced by the room-temperature irradiaion, but complete recovery is seen at 500⁰C. These trapping sites are assumed to be small vacancy clusters or small dislocation loops. Some loops of very low concentration were observed near grain boundaries in the as-irradiated specimen of Al by TEM