The effect of impurity level on ultrafine-grained microstructures and their stability in low stacking fault energy silver

► Effect of impurity content on microstructure in ECAP-processed silver was studied. ► There is a lower degree of twinning in the less pure material for high strains. ► The samples processed for 4-16 passes showed self-annealing during storage at RT. ► Small increase of impurity level resulted in a much better stability at RT.