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Abstract

The surfaces and bulk of splat quenched Mg–10Al and Mg–16Al (wt-%) alloys were investigated. The surfaces were studied using X-ray photoelectron spectroscopy (XPS), X-ray excited Auger electron spectroscopy (X-AES), Rutherford backscattering spectrometry (RBS), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA) and the bulk using X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The solid solubility of Al in Mg was extended to at least 16 wt-%. The quantity of Al ions present on the surfaces of the alloys increased with Al content. Contrary to the suggested layered MgO/Mg–Al–oxide/alloy structure, the surfaces of the alloys consisted of an admixture of magnesium spinel (MgAl₂O₄) in periclase (MgO) and brucite (Mg(OH)₂) of non-uniform thickness varying between 10 and 50 nm, determined via RBS, X-AES, and depth profiling using XPS.

MST/1714a

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Development of corrosion resistant magnesium alloys Part 1 Characterisation of splat quenched Mg–10Al and Mg–16Al alloys

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