Abstract
An Al+Y codeposition by a single EB–PVD process has been developed to improve the high-temperature oxidation resistance of a TiAl alloy. The Al+Y codeposited TiAl alloy with various ratios of Al and Y evaporation sources was evaluated by isothermal and cyclic-oxidation tests. The coating layer has a composition gradient because of the difference in vapor pressure between Y and Al. The oxidation resistance can be extensively improved by the formation of an Al+Y codeposition layer and it depends on the ratio of the source material of Al and Y. The best oxidation resistance was obtained from the Al+Y codeposited TiAl alloy with a ratio of Al:2Y. With the proper ratio of Al:Y, the Al+Y codeposition coating forms two layers of the oxides during high-temperature oxidation+the outer (Y, Al)O layer and the inner Al2O3 layer, containing small amounts of Y oxide. These oxide layers, which have a fine grain size, act as a diffusion barrier, thus suppressing the rate of inward diffusion of O and may readily relieve thermal stresses.
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Jung, H.G., Wee, D.M., Oh, M.H. et al. An Al+Y Coating Process for Improvement of the High-Temperature Oxidation Resistance of a TiAl Alloy. Oxidation of Metals 55, 189–208 (2001). https://doi.org/10.1023/A:1010399825117
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DOI: https://doi.org/10.1023/A:1010399825117