About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Electron Microscopy-based Assessment of the Role of Short Range Order on Deformation Behavior of High and Medium Entropy Alloys |
Author(s) |
Daniel L. Foley, James Hart, Elaf Anber, Robert O. Ritchie, Andrew Minor, Mark Asta, Flynn Walsh, Douglas Spearot, Mitra Taheri |
On-Site Speaker (Planned) |
Daniel L. Foley |
Abstract Scope |
Despite their nominal chemical disorder, several studies have reported short range order (SRO) in high entropy alloys (HEAs) – i.e. preferential bonding, local elemental enrichment and/or clustering – such SRO may have broad implications for HEA performance. In an FCC metal or alloy the mode of deformation, such as slip or twinning, is dependent on that alloy’s stacking fault energy (SFE) and the energetic landscape encountered by dislocations. The assumed chemical disorder in HEAs is thought to lead to locally variable SFE, but it remains unclear how SRO modulates this energetic landscape. To tackle this problem, a suite of spatially resolved electron imaging, diffraction, and spectroscopy techniques is leveraged to correlate local order with deformation induced microstructural evolution in high and medium entropy alloys. The techniques presented enable the direct observation of the interplay between chemistry and microstructure, establishing local order as a key tuning knob for future HEA development. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Characterization, Other |