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Meeting TMS Specialty Congress 2026
Symposium 4th World Congress on High Entropy Alloys (HEA 2026)
Presentation Title High-Temperature Microstructural Stabilization and Oxidation Behavior of Al–Mg Alloys Modified with Zr, Er, and Yb
Author(s) Seong-Ho Ha, Young-Chul Shin, Tae-Yeong So
On-Site Speaker (Planned) Seong-Ho Ha
Abstract Scope This study examines the effects of Zr, Er, and Yb additions on the high-temperature microstructural stability and oxidation behavior of Al–Mg alloys. SEM-EDS and EBSD analyses were conducted to evaluate the formation and distribution of L12-structured intermetallic dispersoids such as Al3Zr, Al3Er, and Al3Yb, which were found to suppress grain boundary migration and recrystallization during thermal exposure. These nanoscale dispersoids contributed to microstructural refinement and reduced diffusion-driven coarsening at elevated temperatures. Cross-sectional examinations of the oxidation layers revealed decreased Mg outward diffusion and the development of a more continuous Al2O3-rich scale in the modified alloys. Thermodynamic calculations using FactSage were performed to predict oxide formation sequences and equilibrium phase constituents, and the calculated results were compared with experimentally observed oxide morphologies to clarify the oxidation mechanisms influenced by Zr, Er, and Yb additions.
Proceedings Inclusion? Undecided

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