Abstract
Ceramic and composite coatings have been extensively studied as candidates for hydromechanical cavitation protection. However, fast crack propagation in hard coatings may lead to catastrophic destruction because of their poor fracture toughness. Here, NiCrAlTi nanocrystalline coating was prepared by magnetron sputtering. After introducing O2 in sputtering gas, moderate amount of oxygen was successfully doped in the coating. Subsequent annealing treatment drove oxygen to react with alloying elements to form in situ nanoprecipitates at the interface, these chemically bonded interfaces enhanced energy dissipation at the crack tip and deflected propagation of cracks in the coatings. Compared with the conventional NiCrAlTi coating, the NiCrAlTi(O) coating exhibited a high H3/E2 ratio of 0.037 GPa and a low cavitation erosion rate of 0.043 mg/h.
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