Abstract
Oxidation behavior of the Mg-X (X = Ca/Gd/Y) alloys at 500 ℃ was studied and had been clarified using thermodynamics and kinetics. The improved high-temperature oxidation resistance by reactive elements was attributed to the formation of compact reactive-element-rich oxide film. The oxides formation priority is determined by the critical concentration of reactive elements based on thermodynamics. A four-layered structure film was formed on Mg-Ca alloys, which was proposed to be caused by alternating enrichment of Ca and Mg atoms at metal/oxide interface. Hydrides was formed in the matrix during oxidation process, resulting from the decomposition of H2O and continues inward diffusion of H.
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