Creep of silver at C

Creep behaviour of polycrystalline silver at C depends primarily on the purity of the Ag. Specimens of 99.999% purity dynamically recrystallized during creep; the stress for recrystallization was MPa. Oxygen partial pressure had no effect on the creep response. For 99.9% Ag, no dynamic recrystallization occurred; instead, steady-state creep was observed, with the rate-controlling deformation occurring primarily by dislocation motion. Long-term annealing of 99.9% Ag in increased the steady-state stress by a factor of . Depending on test conditions, the 99.9% Ag was up to twice as strong as the 99.999% Ag.