“…For annealed materials irradiated at temperatures above 150 C, certainly above 200 C, no dislocation-type radiation damage microstructure or voids are produced; coarse Si particles are seen. In cold rolled pure Al, some large cavities remained 58 after irradiation at 220 C. During postirradiation annealing 59 removal of damage microstructure was slowed by impurity content and by higher doses. For 1 h anneals of 1100Al, void swelling began recovery at 200 C and was almost complete at 300 C where gas bubble swelling intervened.…”