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Effect of Si content on the surface high-temperature oxidation mechanism in Ni 5 Y-containing NiAIYSi alloys

Corrosion Science, ISSN: 0010-938X, Vol: 218, Page: 111173
2023
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Article Description

The influence of Si content on the oxidation behavior of the Y-related structure (Ni 5 Y) in NiAlYSi alloy was investigated. The higher Si content increases the diffusion energy barrier of Ni in the Ni 5 Y phase, preventing the growth of NiO in the outer layer. The inward diffusion of O is effectively impeded by the Y 2 SiO 5 +Y 2 Si 2 O 7 +Al 2 O 3 +Y 2 O 3 layer produced by the (Ni, Al, Si) 5 Y phase. The outward diffusion of Ni is also inhibited by this layer. Therefore, the oxidation mechanism of the Ni 5 Y phase is altered by Si, which has not been found before.

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