In-situ transmission electron microscopy investigation of the influence of hydrogen on the oxidation mechanisms of fine grained magnesium - Normandie Université Access content directly
Journal Articles Materials Chemistry and Physics Year : 2020

In-situ transmission electron microscopy investigation of the influence of hydrogen on the oxidation mechanisms of fine grained magnesium

Abstract

Magnesium oxide is of critical importance for the properties of magnesium alloys designed for solid state storage of hydrogen. The oxidation of Mg was investigated by in-situ transmission electron microscopy under vacuum conditions and 105 Pa of H2 with a special emphasis on the influence of grain boundaries. In agreement with thermodynamic predictions, nucleation and growth of MgO was observed in both conditions, but the mechanisms and the corresponding kinetic are very different. Under vacuum it is assisted by Mg sublimation and relatively fast, while under H2 the oxidation proceeds slowly along grain boundaries that act as nucleation sites.
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Dates and versions

hal-02521105 , version 1 (06-05-2020)

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Xavier Sauvage, Simona Moldovan, Fabien Cuvilly, M. Bahri, T. Grosdidier. In-situ transmission electron microscopy investigation of the influence of hydrogen on the oxidation mechanisms of fine grained magnesium. Materials Chemistry and Physics, 2020, 248, pp.122928. ⟨10.1016/j.matchemphys.2020.122928⟩. ⟨hal-02521105⟩
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