|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Magnesium Technology 2018
||Effect of Calcium on Resistance to Oxidation of Magnesium Alloys (AZ91)
||Hassan Saghafianlarijani, Shima Paridari, Ghasem Isaabadi B.
|On-Site Speaker (Planned)
Magnesium due to its very low density is always attractive in aerospace and transportation industries.However,due to its high reactivity with environment,it’s melting,alloy making and casting is always faced with problems about melt quality.So these alloys have low resistance to oxidation and combustion.Recent studies show that addition of alkali earth metals reduces the oxidation tendency of magnesium alloys melt. The purpose of this paper is study effect of calcium on oxidation resistance of magnesium alloys melt through microstructure studies, XRD test and melt oxidation test. Results show that addition of calcium causes to formation of intermetallic compounds like AL2Ca or Mg2Ca.The formation of these type of compounds in grain boundaries with surface oxide film CaO, prevents the melt oxidation. The most important advantage of these alloys is not applying shielding gases like SF6 which is considered a greenhouse gas and causes many environmental problems.
Keywords: magnesium alloys, Oxidation. Calcium, AL2Ca phase