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

作者：Zhipeng Wang, Zhao Shen, Yang Liu, Yahuan Zhao, Qingchun Zhu, Yiwen Chen, Jingya Wang, Yangxin Li, Sergio Lozano‐Perez, Xiaoqin Zeng · 发表于：Journal of Magnesium and Alloys · 年份：2024 · DOI：10.1016/j.jma.2024.07.009 · 被引用次数：83 · 研究领域：Magnesium Alloys: Properties and Applications、Hydrogen Storage and Materials、Corrosion Behavior and Inhibition

In this study, we investigated the oxidation of the Mg-11Y-1Al alloy at 500°C in an Ar-20%O2 environment. Multiscale analysis showed the network-like long-period stacking ordered (LPSO) phase transformed into needle-like LPSO and polygonal Mg24Y5 phases, leading to the formation of a high-dense network of needle-like oxides at the oxidation front. These oxides grew laterally along the oxide/matrix interfaces, forming a thicker, continuous scale that effectively blocked elemental diffusion. Hence, the preferential oxidation along the needle-like LPSO is believed to accelerate the formation of a thicker and continuous oxide scale, further improving the oxidation resistance of the Mg-11Y-1Al alloy.