Research on the oxidation sequence of Ni-Al-Pt alloy by combining experiments and thermodynamic calculations

Na Ta; Lijun Zhang; Qin Li; Na Ta; Lijun Zhang; Qin Li

doi:10.3934/matersci.2024052

AIMS Materials Science

2024, Volume 11, Issue 6: 1083-1095. doi: 10.3934/matersci.2024052

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Research article

Research on the oxidation sequence of Ni-Al-Pt alloy by combining experiments and thermodynamic calculations

Na Ta ^{1
,
,},
Lijun Zhang ²,
Qin Li ²

1.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received: 18 June 2024 Revised: 05 November 2024 Accepted: 11 November 2024 Published: 25 November 2024

In this paper, a comprehensive study on 1373 K high-temperature oxidation behaviors in a Ni-20 at.% Al-5 at.% Pt system was performed by coupling experimental investigations with CALPHAD (CALculation of PHAse Diagram) calculations. The discussion was expanded to include the effects of chemical concentrations on the degradation mechanism of thermally grown oxide layers during oxidation at 1373 K. A step-by-step oxidation procedure was established: first, aluminum oxide grows on the underside, followed by nickel oxide, which fully develops and penetrates the original aluminum oxide. The formation of NiO leads to aluminum enrichment and nickel depletion; once the concentration of Al achieves a threshold, θ-Al₂O₃ transforms into α-Al₂O₃, forming a tight structure. At this point, Al diffusion toward the exterior predominates, followed by the inward diffusion of O. The diffusion of Ni is gradually restricted by the establishment of the α-Al₂O₃ layer. When Al is not enough, Al₂O₃ combines with NiO to develop NiAl₂O₄. Nickel segregation may also occur during subsequent oxidation at the oxide layer/matrix alloy boundary. Small voids are likely to form due to the merging of the vacancies caused by the unbalanced diffusion of Al toward the Al₂O₃ layer and the opposite diffusion of Ni, resulting in significant peeling failure. Additionally, Pt has a beneficial effect by forming a thinner oxide scale that is more resistant to spallation.
- Ni-Al-Pt,
- high-temperature oxidation,
- CALPHAD,
- NiO,
- Al₂O₃
Citation: Na Ta, Lijun Zhang, Qin Li. Research on the oxidation sequence of Ni-Al-Pt alloy by combining experiments and thermodynamic calculations[J]. AIMS Materials Science, 2024, 11(6): 1083-1095. doi: 10.3934/matersci.2024052

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Abstract

In this paper, a comprehensive study on 1373 K high-temperature oxidation behaviors in a Ni-20 at.% Al-5 at.% Pt system was performed by coupling experimental investigations with CALPHAD (CALculation of PHAse Diagram) calculations. The discussion was expanded to include the effects of chemical concentrations on the degradation mechanism of thermally grown oxide layers during oxidation at 1373 K. A step-by-step oxidation procedure was established: first, aluminum oxide grows on the underside, followed by nickel oxide, which fully develops and penetrates the original aluminum oxide. The formation of NiO leads to aluminum enrichment and nickel depletion; once the concentration of Al achieves a threshold, θ-Al₂O₃ transforms into α-Al₂O₃, forming a tight structure. At this point, Al diffusion toward the exterior predominates, followed by the inward diffusion of O. The diffusion of Ni is gradually restricted by the establishment of the α-Al₂O₃ layer. When Al is not enough, Al₂O₃ combines with NiO to develop NiAl₂O₄. Nickel segregation may also occur during subsequent oxidation at the oxide layer/matrix alloy boundary. Small voids are likely to form due to the merging of the vacancies caused by the unbalanced diffusion of Al toward the Al₂O₃ layer and the opposite diffusion of Ni, resulting in significant peeling failure. Additionally, Pt has a beneficial effect by forming a thinner oxide scale that is more resistant to spallation.

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