In order to study the microstructure of the damaged test pieces of aviation aluminum alloys repaired by cold spraying and the damage characteristics of the repaired test pieces in the re-life extension fatigue test,the cold sprayed repaired damaged test pieces were prepared by cold spraying technology,and the fatigue tests were carried out.The microstructure and fracture of the cold spraying were observed by light microscope scanning electron microscope,and the fatigue damage of cold spraying repair test parts was tested by non-destructive testing.The results show that the cold spraying structure is compact and the porosity is low.The cold sprayed coating is brittle fracture during fatigue.During the fatigue test,the cold spray repair damage test piece shows three kinds of damage successively,the delamination between the substrate and the cold spray layer,the expansion of the substrate crack,and the crack of the cold spray layer.The research work provides certain technical support for the further engineering application of aerospace aluminum alloy cold spray repair technology.
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