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Polycrystalline nickel was irradiated using 50 keV He ions at room temperature. The irradiated fluences were 5× 1013 He cm−2, 5× 1014 He cm−2, and 5× 1015 He cm−2, respectively. Positron annihilation Doppler broadening spectroscopy (DBS) was used to characterize the irradiation-induced defect evolution. The DBS results show that a large amount of vacancy defects were introduced in the specimens after helium irradiation. In addition, the DBS data could be also interpreted as the formation of helium-vacancy (HenVm) clusters due to combination between vacancies and helium atoms.

Effect of helium irradiation fluence on HenVm cluster evolution in nickel studied by positron annihilation spectroscopy