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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Thermodynamics and Kinetics of Alloys IV
Presentation Title Optimization of Electron Backscatter Diffraction Techniques for High-Resolution Phase Identification in Aluminum Alloys
Author(s) XiaoXiang Yu, Sivaji Karna, Zachary Haddock, Paul Nolan, John E Carsley
On-Site Speaker (Planned) XiaoXiang Yu
Abstract Scope Accurate phase identification in multi-phase aluminum alloys is critical for understanding microstructure-property relationships and guiding alloy design. This study presents a robust methodology for phase discrimination in AA5182 aluminum alloy using high-resolution electron backscatter diffraction (EBSD) in conjunction with energy-dispersive X-ray spectroscopy (EDS). Emphasis is placed on optimizing sample preparation, where ion milling combined with a low-voltage cleaning step effectively eliminates surface deformation and redeposition artifacts. The approach enhances EBSD indexing accuracy, particularly for Mg₂Si particles, which are crystallographically similar to the aluminum matrix. Subtle differences in Kikuchi band width are leveraged to distinguish structurally similar intermetallics, while simultaneous EBSD-EDS mapping enables cross-validation of crystallographic and compositional data. The findings demonstrate the limitations of composition-based phase identification and highlight the advantages of structure-based methods. This work establishes a comprehensive framework for microstructural characterization in complex aluminum alloys and offers practical guidance for EBSD-based analysis in both research and industrial settings.
Proceedings Inclusion? Planned:
Keywords Aluminum, Characterization, Sustainability

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