Abstract
A Y-coated Ni3Al with a postheattreatment shows much better oxidation resistance than aY-coated Ni3Al without a postheat treatment.In order to explain the effect of postheat treatment atlow oxygen pressure, postheat treatment after Y-ion plating wasperformed in flowing hydrogen as a function of time.During these treatments, the Y-coated layer was modifiedinto a (Y, Al)O-type oxide by reaction betweenY2O3 and Al2O3. The thicknessof the modified Y-layer was related to oxygen pressureand time. The Y-modified layer formed by postheattreatment acts as a barrier to the transport of oxygen.The fine (Y, Al)O-type oxide can easily relieve growth stress bypermitting easy plastic deformation, and the (Y,Al)O-type oxide layer can absorb the thermal stressdeveloped in the Al2O3 layer. Thetensile stress generated by the difference in thermal-expansioncoefficients of the (Y, Al)O-type oxide and theAl2O3 layer compensates the largecompressive stress generated by the difference inthermal-expansion coefficients of the Al2O3 layer andthe Ni3Al alloy.
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Jung, H.G., Kim, K.Y. Effect of a Yttrium Coating on the Oxidation Behavior of Ni3Al (II). Oxidation of Metals 49, 403–430 (1998). https://doi.org/10.1023/A:1018807214002
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DOI: https://doi.org/10.1023/A:1018807214002