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Combined influence of Be and Ca on improving the high-temperature oxidation resistance of the magnesium alloy Mg-9Al-1Zn

The present work showed that the oxidation resistance of Mg-9Al-1Zn at elevated temperatures was improved by combined alloying with Be and Ca. AZ91 alloyed with 20ppm (wt) Be and 0.5wt.% Ca had higher oxidization resistance than that of AZ91 containing 60ppm (wt) Be. The improved oxidation resistance was attributed to (a) the formation of a Be-reinforced compact CaO-MgO composite layer on the alloy surface, and (b) suppressing the grain boundary evaporation of Mg by (i) the elimination of Mg-Al eutectic micro-constituent, and (ii) the increase in thermal stability of the ?-Mg17Al12 due to the Ca alloying.

» Author: Qiyang Tan, Ning Mo, Bin Jiang, Fusheng Pan, Andrej Atrens, Ming-Xing Zhang

» Reference: Corrosion Science

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