Abstract In this work, we present characterization of surface oxidation and crystallization behavior of Metal Amorphous Nanocomposite (MANC) (Fe70Ni30)80Nb4Si2B14 alloys via complementary x-ray diffraction, electron microscopy, and x-ray photoelectron spectroscopy techniques. An adherent amorphous oxide of roughly 15–20 nm in thickness is observed on the wheel side of the ribbon, enriched in Fe relative to Ni and with significant content of Si and Nb as would be expected based upon a comparison of the Gibbs free energy of formation of the stable oxide phases. The amorphous character of the oxide is likely to result from the significant Si-content coupled with the amorphous and nanocrystalline character of the underlying metallic layer. Higher density of FeNi-enriched nanocrystals is also observed within ∼100 nm of the wheel-side surface, presumably due to reduction in local glass former concentration. A rough, crystalline copper oxide layer is also present and forms through contact between the copper wheel and the solidifying melt during the rapid solidification process. On the air side of the ribbon, a crystalline oxide layer of ∼15–20 nm is formed as well as intergranular oxidation that penetrates along the grain boundaries between highly textured surface crystallites of ∼50–100 nm in size. The crystalline nature of the oxide on these surfaces is asserted to result from the lack of significant Si-content and the pre-existing surface crystallites that form during the rapid solidification process which promote a crystalline oxide surface layer. These results shed new insights into the details of surface oxidation and can help to inform processing and alloy composition adjustments which seek to tailor surface properties.

中文翻译：

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FeNi基软磁纳米晶和非晶纳米复合合金的表面氧化和结晶

摘要 在这项工作中，我们通过互补 X 射线衍射、电子显微镜和 X 射线光电子能谱技术对金属非晶纳米复合材料 (MANC) (Fe70Ni30)80Nb4Si2B14 合金的表面氧化和结晶行为进行了表征。在带的轮侧观察到厚度约为 15-20 nm 的粘附性无定形氧化物，相对于 Ni，Fe 含量较高，Si 和 Nb 含量较高，如基于 1 的吉布斯自由能的比较所预期的那样。形成稳定的氧化物相。氧化物的无定形特征很可能是由于显着的 Si 含量加上下面金属层的无定形和纳米晶特征造成的。在轮侧表面约 100 nm 内也观察到更高密度的 FeNi 富集纳米晶体，可能是由于局部玻璃形成剂浓度的降低。在快速凝固过程中，还存在粗糙的结晶氧化铜层，并通过铜轮和凝固熔体之间的接触形成。在带的空气侧，形成约 15-20 nm 的结晶氧化物层以及沿约 50-100 nm 尺寸的高度纹理化表面微晶之间的晶界渗透的晶间氧化层。断言这些表面上氧化物的结晶性质是由于缺乏显着的 Si 含量和在快速固化过程中形成的预先存在的表面微晶导致结晶氧化物表面层。