Abstract To clarify the influence of manganese on the oxidation behavior of Ni–Cr alloys, high resolution transmission electron microscopy was used to examine the microstructure and chemistry of oxide scales forming at 1050 °C on Ni–25Cr–xMn (x = 0.5, 1 and 1.5% wt) in 200 Pa O2. The scales consisted of two layers of chromia and one layer of spinel Mn1+xCr2-xO4. The internal layer exhibited an equiaxed grain structure, whereas columnar grains developed in the outer layer. The results demonstrated that the spinel composition at the chromia-spinel interface was similar regardless of the manganese concentration.

中文翻译：

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Ni-25Cr-xMn（x = 0.5、1 和 1.5% wt）在 200 Pa O2 环境中在 1050 °C 上形成的保护性氧化皮的微观结构表征

摘要 为了阐明锰对 Ni-Cr 合金氧化行为的影响，使用高分辨率透射电子显微镜检查在 1050 °C 下在 Ni-25Cr-xMn (x = 0.5, 1和 1.5% wt) 在 200 Pa O2 中。鳞片由两层氧化铬和一层尖晶石Mn1+xCr2-xO4 组成。内层为等轴晶结构，外层为柱状晶。结果表明，无论锰浓度如何，氧化铬-尖晶石界面处的尖晶石成分都相似。