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- W377860995 abstract "In order to clarify spalling mechanism of oxide scale on NiAl, microstructures in the vicinity of NiAl–X(Hf, Zr)⁄oxide scale interfaces were observed by using TEM. The oxidation tests were done at 1373 K in air for up to 360 ks. In NiAl, many voids were formed at the substrate⁄Al2O3 interface, leading to spalling of the alumina scale. On the other hand, addition of Hf or Zr to NiAl led to suppression of the void formation, resulting in prevention of spalling of alumina scale. In addition, a Ni–AlO layer tended to be formed at the interface in NiAl. This demonstrates appreciable increase in oxygen partial pressure and nickel activity at the interface. In fact, GDS measurements indicated depression of the Al concentration in the substrate close to an alumina scale. Consequently, it was speculated that the addition of Hf or Zr led to increase in diffusivity of Al in the substrate and suppression of void formation at NiAl⁄alumina scale, resulting in prevention of spalling of an alumina scale." @default.
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- W377860995 date "2006-01-01" @default.
- W377860995 modified "2023-10-17" @default.
- W377860995 title "Effect of Alloying Element on Microstructure of NiAl-X ^|^frasl;Oxide Scale Interface" @default.
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- W377860995 doi "https://doi.org/10.7791/jhts.32.118" @default.
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