Abstract In this study, we report a type of ultra oxidation and spallation resistant Y/Hf-doped AlCoCrFeNi high-entropy alloy (HEA). The alloy exhibits a significantly lower oxidation rate at 1100 °C with a kp value of about 1.9 × 10−13 g2 cm-4s-1, which is one magnitude lower than those of the conventional NiCoCrAlY alloys. Additionally, the alloy shows a strong resistance to the oxide scale spallation. The superior oxidation performance for the Y/Hf-doped HEA can be attributed to the fast establishment of exclusive α-Al2O3 scale, the beneficial reactive element effect and the large columnar grain size (width) in the oxide scale.

中文翻译：

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Y/Hf掺杂AlCoCrFeNi高熵合金，具有超强抗氧化和抗散裂性

摘要 在本研究中，我们报道了一种超抗氧化和抗散裂的 Y/Hf 掺杂 AlCoCrFeNi 高熵合金 (HEA)。该合金在 1100 °C 时表现出明显较低的氧化速率，kp 值约为 1.9 × 10−13 g2 cm-4s-1，比传统的 NiCoCrAlY 合金低一个数量级。此外，该合金对氧化皮剥落具有很强的抵抗力。Y/Hf 掺杂 HEA 的优异氧化性能可归因于快速建立专属的 α-Al2O3 氧化皮、有益的反应元素效应和氧化皮中大的柱状晶粒尺寸（宽度）。