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This paper studies the effect of the existing state of Y element on the high temperature oxidation resistance of magnesium alloys. Different levels of Al element were added into Mg–2.5Y alloy to obtain different existing state of Y. The oxidation rate of Mg–2.5Y–2.5Al alloy is the highest among Mg–2.5Y, Mg–2.5Y–2.5Al and Mg–2.5Y–4.2Al alloys at 500°C. An effective and protective Y2O3/MgO composite...
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