Abstract The influences of alloyed Lu, Hf and Cr on the oxidation and spallation behavior of NiAl were investigated. Although Lu has a “block effect” of Al as Hf does, the oxidation rate of Lu-doped NiAl is significantly higher, due to: (1) inhibitation of θ- to α-Al2O3 transformation in early oxidation stage; (2) stronger scale grain refinement effect and enhanced oxygen transport rate. Segregation of S and C occurs not only at the alloy/scale interface, but also within the scale. Both Lu and Hf can significantly improve the scale adherence. However, This beneficial effect can be easily overcompensated by Cr.

中文翻译：

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Lu、Hf和Cr合金化对NiAl氧化和散裂行为的影响

摘要 研究了合金化Lu、Hf和Cr对NiAl氧化和剥落行为的影响。尽管 Lu 与 Hf 一样具有 Al 的“阻滞效应”，但 Lu 掺杂的 NiAl 的氧化速率明显更高，这是由于： (1) 在氧化早期抑制了 θ- 到 α-Al2O3 的转变；(2) 更强的鳞片晶粒细化作用和增强的氧传输速率。S 和 C 的偏析不仅发生在合金/氧化皮界面上，也发生在氧化皮内部。Lu 和 Hf 均能显着提高标尺附着力。然而，这种有益效果很容易被 Cr 过度补偿。