In this research, an attempt was made to investigate the short-time oxidation of Al–Mg melt using oxide/metal/oxide sandwich method. Samples were produced by controlled blowing of bubbles with the pressure of 0.2 atm through the aluminum melt containing 1, 3 and 5.5 weight percent of Mg at 670 °C. Various characteristics of dynamically formed oxide films such as wrinkles, folds, holes, cracks and re-oxidation patterns were studied through microscopic analysis. It appeared that re-oxidation patterns are the main features of the dynamically formed oxide films. Also, separation of oxide films in the oxide/oxide interface and loose connections with the paired metal were other important phenomena. Thickness of the oxide films was measured to be 19, 31 and 51 nm for Al–1 Mg, Al–3 Mg, and Al–5.5 Mg samples, respectively. Thermodynamic-based considerations revealed the formation of MgO, MgAl2O4 and Al2O3 as possible product of the oxidation within the range of this study. However, MgAl2O4 was only detected in Al–1 Mg and Al–3 Mg samples based on XRD analysis while there was no evidence of Al2O3 formation at all. Furthermore, MgO was the main oxide in both Al–3 Mg and Al–5.5 Mg sandwich samples. High concentration and activity of magnesium at the surface of the melt along with the turbulent situation and short time duration of the oxidation process can be considered as the main discrepancy cause between thermodynamics and experimental results.

中文翻译：

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动态条件下 Al-Mg 的短时氧化

在这项研究中，尝试使用氧化物/金属/氧化物夹层法研究 Al-Mg 熔体的短时氧化。通过在 670°C 下以 0.2 个大气压的压力将气泡受控吹过含有 1、3 和 5.5 重量% Mg 的铝熔体来生产样品。通过显微分析研究了动态形成的氧化膜的各种特性，例如皱纹、褶皱、孔洞、裂纹和再氧化模式。看来再氧化模式是动态形成的氧化膜的主要特征。此外，氧化物/氧化物界面中氧化物膜的分离以及与配对金属的松散连接是其他重要现象。对于 Al-1 Mg、Al-3 Mg 和 Al-5.5 Mg 样品，氧化膜的厚度分别测量为 19、31 和 51 nm。基于热力学的考虑表明 MgO、MgAl2O4 和 Al2O3 的形成可能是本研究范围内氧化的产物。然而，基于 XRD 分析仅在 Al-1 Mg 和 Al-3 Mg 样品中检测到 MgAl2O4，而根本没有形成 Al2O3 的证据。此外，MgO 是 Al-3 Mg 和 Al-5.5 Mg 夹层样品中的主要氧化物。熔体表面镁的高浓度和活性以及湍流情况和氧化过程持续时间短可以被认为是热力学和实验结果之间存在差异的主要原因。基于 XRD 分析仅在 Al-1 Mg 和 Al-3 Mg 样品中检测到 MgAl2O4，而根本没有形成 Al2O3 的证据。此外，MgO 是 Al-3 Mg 和 Al-5.5 Mg 夹层样品中的主要氧化物。熔体表面镁的高浓度和活性以及湍流情况和氧化过程持续时间短可以被认为是热力学和实验结果之间存在差异的主要原因。基于 XRD 分析，仅在 Al-1 Mg 和 Al-3 Mg 样品中检测到 MgAl2O4，而根本没有形成 Al2O3 的证据。此外，MgO 是 Al-3 Mg 和 Al-5.5 Mg 夹层样品中的主要氧化物。熔体表面镁的高浓度和活性以及湍流情况和氧化过程持续时间短可以被认为是热力学和实验结果之间存在差异的主要原因。