Abstract
AZ61 magnesium alloys containing 0, 0.5, and 1 wt% CaO were cast, hot extruded, and oxidized between 450 and 550 °C in atmospheric air. The initial CaO particles changed to Al2Ca along the grain boundaries and Ca that dissolved in the α-Mg matrix. The oxidation resistance of AZ61 increased with the addition of CaO and extrusion. AZ61 + 1 wt% CaO cast and extruded alloys did not ignite up to 700 °C through the formation of a superficial CaO barrier layer on the MgO-rich scale. Extrusion fragmented the Al2Ca particles, and refined the matrix grains to enhance the formation of the CaO barrier layer.
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