Surface Rumpling Behavior of Hf/Zr Single-Doped and Co-Doped beta-NiAl Coatings during High-Temperature Cyclic Oxidation

文献类型： 外文期刊

第一作者： Wang, Shixing

作者： Wang, Shixing;He, Jian;Song, Honghai;Liang, Sijia;Peng, Hui;Guo, Hongbo;Wang, Shixing;He, Jian;Song, Honghai;Liang, Sijia;Peng, Hui;Guo, Hongbo;Wang, Shixing

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关键词： NiAl coating; reactive elements; co-doping; rumpling; cyclic oxidation

期刊名称：COATINGS （ 影响因子：2.881； 五年影响因子：3.038 ）

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年卷期： 2020 年 10 卷 9 期

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收录情况： SCI

摘要： Reactive elements like Hf- and Zr-doped beta-NiAl are considered to be promising candidate materials for protective coatings used at ultra-high temperatures. However, the role of reactive element co-doping on cyclic oxidation behavior and the surface rumpling of beta-NiAl coatings remains unclear. Thus, in this paper, Hf and Zr single-doped and co-doped beta-NiAl coatings were deposited on a single crystal superalloy by electron beam physical vapor deposition and the cyclic oxidation at 1150 degrees C was investigated. The coatings yielded a similar oxidation rate during cyclic oxidation. Obvious surface rumpling appeared in the single-doped coatings, whereas it was effectively alleviated in the co-doped coating. Related mechanisms were discussed, including thermal expansion mismatch, martensitic transformation and phase transformation from beta-NiAl to gamma '-Ni3Al. The non-uniform phase transformation from beta to gamma ' was finally believed to be responsible for the discrepancy in the rumpling extents between the single-doped and co-doped coatings.

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