The effect of LPSO phase on the high-temperature oxidation of a stainless Mg-Y-Al alloy
Zhipeng Wang, Zhao Shen, Yang Liu, Yahuan Zhao, Qingchun Zhu, Yiwen Chen, Jingya Wang, Yangxin Li, Sergio Lozano‐Perez, Xiaoqin Zeng
Abstract
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.