The corrosion and oxidation resistance improvement of DZ4 Ni-based superalloy irradiated by high intensity pulsed ion beams

In this paper, the DZ4 Ni-based superalloy was irradiated by high intensity pulsed Cn+ + H+ ion beam. The parameters of ion beam were: accelerating voltage 250 kV, pulse duration 70 ns, ion current density 160 A/cm(2). Irradiation pulses were 2, 5, 10 and 15. The morphology of DZ4 before and after irradiation was observed by scanning electron microscope (SEM). The phase structure and stress state were analyzed by X-ray diffraction (XRD). The results show that there were some craters on the surface of the sample after irradiation, as the irradiation time increased, the crater boundary became blurred and even disappeared. The surface tensile stress produced by initial irradiation could be relieved after several irradiations pulses. The corrosion resistance of irradiated DZ4 alloy was improved greatly. The continuous and dense alpha-Al2O3 layer that formed on irradiated DZ4 surface at 1000 degrees C atmosphere increased the high temperature oxidation resistance.