Deal–Grove model revisited for a new insight into the oxidation of molten aluminum alloy: The A356 alloy, as a model system,AIChE Journal

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Deal–Grove model revisited for a new insight into the oxidation of molten aluminum alloy: The A356 alloy, as a model system
AIChE Journal ( IF 3.5 ) Pub Date : 2021-02-06 , DOI: 10.1002/aic.17230
Kévin Patouillet _{1,

2} , Laurent Davoust ₃ , Olivier Doche ₃

Affiliation

Oxidation of A356 aluminum alloy at molten state is investigated from thermogravimetric analyses. Linear kinetics followed by unexpected logarithmic kinetics is observed during the oxidation process. Scanning electron microscopy imaging coupled with wavelength-dispersive X-ray spectroscopy analyses reveal a heterogeneous oxide layer composed of spinel (MgAl₂O₄) embedded in a nonoxidized alloy matrix. Nonlinear diffusion of magnesium through the heterogeneous oxide layer is the key mechanism proposed to explain the logarithmic kinetics. The growth of spinel phase causes a growing complexification of the aluminum network through which magnesium is diffusing. To model the magnesium transport through the oxide layer, an effective diffusion coefficient, build from the pioneering approach developed by Davies et al. (Davies, D., Evans, U. & Agar, J. (1954) Proc. Roy. Soc. London. A., 225, 443), is introduced in the Deal–Grove model.

中文翻译：

重新审视 Deal-Grove 模型以获得对熔融铝合金氧化的新见解：A356 合金，作为模型系统

通过热重分析研究了 A356 铝合金在熔融状态下的氧化。在氧化过程中观察到线性动力学和意想不到的对数动力学。扫描电子显微镜成像结合波长色散 X 射线光谱分析揭示了由尖晶石 (MgAl ₂ O ₄) 嵌入非氧化合金基体中。镁通过异质氧化物层的非线性扩散是解释对数动力学的关键机制。尖晶石相的生长导致镁扩散通过的铝网络的日益复杂化。为了模拟镁通过氧化物层的传输，一个有效的扩散系数，由 Davies 等人开发的开创性方法构建。(Davies, D., Evans, U. & Agar, J. (1954) Proc. Roy. Soc. London. A., 225, 443)，在 Deal–Grove 模型中被引入。

更新日期：2021-02-06

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