[en] The relation between the recrystallization of metals and background internal friction is established. Internal friction as a function of temperature was measured, after annealing at 720 K for 2 h, for 4 N pure aluminium samples with cerium content of 0.0-3.0 wt% (six in number) in Ke's vacuum torsion pendulum. From the changes of the background internal friction with cerium content, it has been shown that when cerium content (Ce%) is less than 0.5%, cerium has an insignificant effect on the recrystallization of aluminium; when Ce% is more than 0.5%, the opposite is true: cerium increases the recrystallization temperature of aluminium significantly. (author). Letter-to-the-editor