About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
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| Presentation Title |
STEM Analysis of Dislocation-Precipitate Interactions in BCC+B2 Fe75Al15Ni10 at Room and Elevated Temperatures |
| Author(s) |
Bryan Crossman, Junxin Wang, Loic Perriere, Jean-Philippe Couzinié, Maryam Ghazisaeidi, Michael Mills |
| On-Site Speaker (Planned) |
Bryan Crossman |
| Abstract Scope |
The high-temperature capabilities of multi-phase refractory complex concentrated alloys (RCCAs) make them promising candidates for improving efficiency in energy and transportation applications. However, BCC+B2 RCCAs often exhibit limited room-temperature ductility, high-temperature phase instability, and their deformation mechanisms remain underexplored. This work investigates dislocation-precipitate interactions, with an emphasis on slip transmission, in a model BCC+B2 Fe75Al15Ni10 alloy at room and elevated temperatures. The alloy’s microstructure consists of coherent NiAl B2 precipitates embedded in a FeAl-rich BCC matrix. Post-mortem analysis of compression specimens reveals deformation by ½<111> dislocations that interact strongly with B2 precipitates. STEM-based diffraction contrast imaging (DCI), including two-beam and weak-beam dark field (WBDF) techniques, is employed to characterize dislocation interactions. Findings from this study provide insight into the role of dislocation-precipitate interactions in BCC+B2 microstructures and may inform the design of RCCAs with enhanced mechanical performance across a wide temperature range. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, High-Temperature Materials |