@article{Zhou2026, 
author = {Cui Zhou and Zhilin Tian and Liya Zheng and Sikai Wang and Tiefeng Du and Jiemin Wang and Bin Yang and Min Guo and Luchao Sun and Jingyang Wang},
title = {Comparative study of water vapor corrosion resistance in directionally solidified RE3Al5O12/Al2O3 eutectic ceramics at 1500℃: Effect of eutectic structure and rare earth elements},
year = {2026},
journal = {Extreme Materials},
volume = {2},
number = {1},
pages = {58-68},
keywords = {Water vapor corrosion, Directional solidification, RE3Al5O12/Al2O3, Eutectic ceramic},
url = {https://www.sciopen.com/article/10.1016/j.exm.2026.100021},
doi = {10.1016/j.exm.2026.100021},
abstract = {Al2O3-based directionally solidified eutectic (DSE) ceramics are recognized as promising candidates for high-temperature structural materials in advanced aeroengines. Nevertheless, their corrosion resistance at elevated temperatures continues to pose a critical challenge, limiting broader application in hot-section components. This study investigates corrosion behavior of RE3Al5O12 (REAG)/Al2O3 (RE = rare earth) DSE ceramics in water vapor atmosphere (90 H2O(g) + 10 vol% air(g)) at 1500℃ for durations up to 200 h, with focus on the influence of eutectic structure and RE elements in garnet phases via examining three samples (high-entropy (Y0.2Gd0.2Ho0.2Er0.2Yb0.2)3Al5O12 DSEs fabricated at 10 and 300 mm/h and YAG/Al2O3 DSE grown at 10 mm/h). The results indicate that REAG/Al2O3 DSE ceramics exhibit excellent water vapor corrosion resistance at 1500℃ for up to 200 h, with mass loss values ranging from −0.00757 to −0.00708 mg·cm−2·mg−1. During corrosion, Al2O3 phase acts as corrosion-susceptible component compared to REAG phase, with corrosion depth showing a nearly linear relationship with the average Al2O3 lamellar width. In addition, garnet phases experience slight grain growth, reducing the contact area between water vapor and Al2O3 phase; Gd demonstrates the slowest diffusion rate when compared to other RE elements. Despite these changes, all samples maintain their preferred crystallographic orientations, confirming the structural stability of REAG/Al2O3 DSEs under water vapor atmosphere at 1500℃.}
}