Zeyu Chen, Yiling Huang, Fan Peng, Chucheng Lin, Wei Zheng, Xuemei Song, Yaran Niu, Yi Zeng
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Unveiling the Corrosion Mechanisms of High-Entropy RETaO4 Through In Situ Observation
The ambiguous understanding of calcium-magnesium aluminosilicate (CMAS) corrosion mechanisms in RETaO4 has hindered performance optimization through rare-earth compositional engineering. This study systematically investigates the corrosion behavior of 3–10 component RETaO4 systems. In situ X-ray diffraction/Transmission electron microscope coupled with Electron backscatter diffraction analysis unveils dynamic reaction pathways during the pre-corrosion heating stage, identifying the crystallization and growth patterns of dominant corrosion product pyrochlore-structured (Ca2-a-bREaAlb)(Ta2-c-dMgcSid)O7. A reaction-diffusion mechanism of CMAS corrosion for RETaO4 is proposed, highlighting the different behaviors of various rare earth elements in the corrosion process. Among eight types of RETaO4, La1/6Nd1/6Sm1/6Eu1/6Gd1/6Dy1/6TaO4 exhibits the best corrosion resistance, with a relatively thin corrosion layer and the ability to avoid element segregation and localized infiltration. These findings establish composition-property relationships for designing next-generation corrosion-resistant thermal barrier coatings.
期刊介绍：
Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.
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