Abstract
For the purpose of the partial strengthening of the substrate, the aluminum alloy coating with dispersed nanoscale quasicrystalline particles produced by cold spray was developed. In this research, the thermo-mechanical fatigue behavior of the coating was evaluated. The cold spray was carried out on condition of the gas temperature 673K and gas pressure 3MPa. Out-of-phase type thermo-mechanical fatigue (TMF) tests were performed for the AC2B-T6 substrate samples and the coating samples with the temperature range of 323-523K. According to evaluation of the coating, there is no void at internal coating and the interface between coating and substrate. It was clear that there is the tendency of improvement of the thermo-mechanical fatigue lives by the cold spray coating compared with the substrate samples. It was suggested that the improvement of the TMF lives was due to the suppression of the initiation or the propagation of the surface cracks of the substrate by the coating.
