The NiCoCrAlYSiHf coatings were modified via high-current pulsed electron beam (HCPEB) in this contribution. The surface state (surface roughness and macro morphology) and microstructures (phase composition

crystal defects

and reactive element distribution) of the original and irradiated coatings were comparatively characterized. Thermal cycling tests at 1100 ℃ were also performed. Microstructural characterization results show that preparation defects of the original coating are eliminated

and the irradiated coating surface becomes smooth and dense. In addition

abundant plastic deformation structures and uniformly distributed reactive element precipitates (nano-sized) can be observed. These irradiated effects can ensure the chemical stability of the thermally grown oxide (TGO) during the cycling process and significantly delay the cracking and spallation of TGO. The thermal cycling resistance of the irradiated coatings is improved significantly.