Abstract
The isothermal oxidation of liquid binary aluminum alloys with 1–9 wt-% magnesium was studied thermogravimetrically for temperatures in ranges extending from their solidus temperatures to 725°C. For all of these compositions, the most stable chemcal species is MgO and this was the only oxide component detected by X-ray, EDX and electron diffraction techniques. The initial oxide film formed on the clean liquid metal substrate was amorphous and highly protective, restricting the oxidation rate. After an incubation period of 1–2 hr. , depending on the magnesium content of the metal, the oxidation accelerated abruptly, an event associated with the onset of crystallisation. The effects are attributed to (i) structural characteristics of amorphous MgO and (ii) disruption of the original protective oxide film by stresses induced by the growth of crystalline MgO nucleated within the amorphous layer. Within the solidus/liquidus temperature range, the oxide film was crystalline throughout the oxidation period and oxidation was rapid ab initio.
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© 2016 The Minerals, Metals & Materials Society
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Silva, M.P., Talbot, D.E.J. (2016). Oxidation of Liquid Aluminum — Magnesium Alloys. In: Grandfield, J.F., Eskin, D.G. (eds) Essential Readings in Light Metals. Springer, Cham. https://doi.org/10.1007/978-3-319-48228-6_17
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DOI: https://doi.org/10.1007/978-3-319-48228-6_17
Publisher Name: Springer, Cham
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