Abstract
Mg–Al–Ca alloy is relatively cost effective and has excellent creep resistance. Aluminum is one of the most important elements in this alloy system. In this study, effect of the amount of aluminum on mechanical properties and microstructures is investigated by using semi-solid injection molded Mg–Al–Ca alloy. The mechanical properties are hardly influenced by the amount of aluminum. This is different from the behavior of common Mg–Al alloys. In the case of Mg–3Al–3Ca, intermetallic compound on grain boundary is (Mg, Al)2Ca that some magnesium sites of Mg2Ca occupied by aluminum atoms. As the amount of aluminum increases, (Mg, Al)2Ca changes to (Mg, Al)2 (Ca, Al) that some calcium sites of Mg2Ca occupied by aluminum, too. Mg2Ca structure of the intermetallic compound on grain boundary is stable and crystallization of Al2Ca or Al4Ca does not occur even if the amount of Al in the compound increases to 50 at%. This may be the reason why the amount of aluminum does not affect the mechanical properties.
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