Abstract
Yttrium-coated Ni3Al with post heat treatment has shown good high-temperature oxidation resistance. To understand the effect of the Y-coating and post heat treatment on the oxidation resistance of Ni3Al, the specimens were coated with Y by an ion-plating method, and heat treatment was performed at low oxygen level before or after the Y-coating was applied. Performance of the Y-coated Ni3Al was evaluated by isothermal and cyclic oxidation tests. A simple deposition of Y on Ni3Al did not change the oxidation kinetics, but the post heat treatment after Y-ion plating significantly decreased the oxidation rate of Ni3Al. The scale formed on Y-coated Ni3Al with post heat treatment after Y-ion plating showed a fine and dense structure which was grain refined by the presence of a (Y, Al) O-type oxide in the scale. The coated Y layer becomes a Y-Al compound during heat treatment. The presence of the (Y, Al)O-type oxide in grain boundaries or the lattice of Al2O3 modify the diffusion rate of Al and oxygen, and the oxide microstructure during oxidation. Improvement of cyclic-oxidation resistance of Ni3Al by the Y-coating occurs because the presence of (Y, Al)O-type oxide develops fine-grain oxides which can easily relieve the growth stress.
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Jung, H.G., Kim, K.Y. Effect of yttrium coating on the oxidation behavior of Ni3Al. Oxid Met 46, 147–167 (1996). https://doi.org/10.1007/BF01046888
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DOI: https://doi.org/10.1007/BF01046888