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- W4309333417 abstract "The NiAlHf and NiAlHfY coatings were deposited on a nickel-based single crystal superalloy using arc ion plating technology. The microstructural evolution and element interdiffusion behavior of the NiAlHf and NiAlHfY coatings were investigated under a 1200 °C thermal exposure process. The results showed that the NiAlHfY coating had a higher residual Al content and fewer topologically close-packed (TCP) phases, which implied that Y effectively retarded the diffusion rate of related elements. Besides, the inward diffusion of Al and outward diffusion of Ni lead to a γ → γ´ phase change and the formation of different TCP phases, resulting from the main precipitating elements (Cr, Mo, Re, W, and Ta) having a lower solubility in γ´. Moreover, it is found that the σ and Laves phase precipitate in the interdiffusion zone, which is described by an intergrowth relationship, where the σ phase is a metastable phase and plays a key role in forming the Laves phase. Finally, the interdiffusion mechanism of the elements is proposed. • The residual content of Al in NiAlHfY coating (about 30 at. %) is higher than than of NiAlHf coating (about 20 at. %) after oxidation 200 h. • The number of TCP phases in NiAlHfY coating is lesser than that of NiAlHf coating, suggesting that Y can effectively slow down the diffusion rate of Al and Ni. • The rod-like and blocky σ and Laves phases are precipitated in IDZ, and needle-like σ phase is precipitated in SRZ. • σ phase and Laves phase have an intergrowth relationship, σ phase serves as the nucleation site for Laves phase." @default.
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- W4309333417 date "2022-12-01" @default.
- W4309333417 modified "2023-10-14" @default.
- W4309333417 title "Microstructural evolution and element interdiffusion of NiAlHf and NiAlHfY coatings deposited on a Ni-based superalloy" @default.
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- W4309333417 doi "https://doi.org/10.1016/j.surfcoat.2022.129075" @default.
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