Abstract The cyclic oxidation behavior of two high-Mo containing Ni-based single crystal superalloys with different Al contents at 1100 °C has been investigated. The higher formation tendency of the continuous and dense α-Al 2 O 3 scales in the alloy with higher Al content can prevent the volatilization of MoO 3 through decreasing the diffusion of Mo. Besides the spallation of oxide scales, the volatilization of refractory metal oxides can also result in the mass loss of the samples in the cyclic oxidation tests, especially in the Ni-based single crystal superalloys with high contents of refractory elements and weak formation tendency of continuous α-Al 2 O 3 scales.

中文翻译：

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高钼镍基单晶高温合金循环氧化过程中钼氧化物挥发的作用

摘要 研究了两种不同Al含量的高钼Ni基单晶高温合金在1100℃下的循环氧化行为。Al含量较高的合金中连续致密的α-Al 2 O 3 氧化皮形成趋势较高，可以通过减少Mo的扩散来阻止MoO 3 的挥发。除了氧化皮的散裂，难熔金属氧化物的挥发在循环氧化试验中，尤其是耐火元素含量高、连续α-Al 2 O 3 鳞屑形成趋势较弱的Ni基单晶高温合金，也会导致样品的质量损失。