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In this study, we investigated the oxidation of the Mg-11Y-1Al alloy at500{\deg}C in an Ar-20%O2 environment. Multiscale analysis showed thenetwork-like long-period stacking ordered (LPSO) phase transformed intoneedle-like LPSO and polygonal Mg24Y5 phases, leading to the formation of ahigh-dense network of needle-like oxides at the oxidation front. These oxidesgrew laterally along the oxide/matrix interfaces, forming a thicker, continuousscale that effectively blocked elemental diffusion. Hence, the preferentialoxidation along the needle-like LPSO is believed to accelerate the formation ofa thicker and continuous oxide scale, further improving the oxidationresistance of the Mg-11Y-1Al alloy.

The effect of LPSO phase on the high-temperature oxidation of a stainless Mg-Y-Al alloy