Irradiation Damage in GH3535 Alloy under He Ion Irradiation at High Temperature

The GH3535 alloy was irradiated with 500 keV He ion at 750 ℃ and subsequently characterized using grazing incidence Xray diffraction (GIXRD), transmission electron microscopy (TEM) and nanoindentation measurement. The evolution of radiation defects such as bubbles and dislocation loops was investigated and the nanohardness variations of irradiated samples were surveyed. The results show that a slight distortion is in lattice of irradiated GH3535 alloy. A large number of bubbles and dislocation loops are observed in the irradiated samples with size of 25 nm. Irradiation defects such as bubbles and dislocation loops limit the dislocation mobility to improve the hardness value. The hardness of irradiated samples increases with dose. Up to a dose of 2×1016 cm-2, the irradiated samples show significant hardening saturation, and the hardening degree is 64% calculated by the NixGao model.