Optimizing grain refinement, mechanical properties, and oxidation resistance of Ni3Al intermetallic through Fe doping
The Ni3Al bond-coat in thermal barrier coatings has attracted significant attention due to its phase equilibrium effect with the γ/γ’ Ni-base substrate, which effectively mitigates interdiffusion between the coating and substrate. However, its oxidation resistance and mechanical properties still req...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525003880 |
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| Summary: | The Ni3Al bond-coat in thermal barrier coatings has attracted significant attention due to its phase equilibrium effect with the γ/γ’ Ni-base substrate, which effectively mitigates interdiffusion between the coating and substrate. However, its oxidation resistance and mechanical properties still require improvement. In this study, Fe was doped into Ni3Al at varying concentrations (0.1–1 wt%), and its effects were systematically investigated using both in-situ and ex-situ characterization techniques, complemented by density functional theory calculations. The results indicate that Fe doping effectively suppresses oxide scale spallation and enhances the oxidation resistance of Ni3Al, with the optimal performance observed at 0.5 wt% Fe. The oxidation mechanism of Ni3Al is further elucidated. Additionally, Fe doping refines the grains, increases the density of twin boundaries and stacking faults, and reduces the hardness of Ni3Al. First-principles calculations confirm that Fe doping lowers the stacking fault energy of Ni3Al by modulating atomic bond energies. In conclusion, the grain size, mechanical properties, and oxidation resistance of Ni3Al can be optimized by Fe doping. |
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| ISSN: | 0264-1275 |