Microstructure Changes of Pure Copper after Irradiation under Periodic Temperature Variation

Abstract

  In order to investigate the effect of periodic temperature irradiation on pure copper, heavy ion irradiation under constant temperature and periodic temperature were performed. Specimens were irradiated up to 10 dpa in the temperature range of 373-673 K. The formation and growth of voids were suppressed by the periodic temperature irradiation. In comparison with the constant temperature irradiation at 673 K, number density of void decreased by the periodic temperature irradiation. This result was explained by the disappearance of small vacancy-type clusters (formed at 673 K) during successive irradiation at 473 K.