About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
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| Presentation Title |
Frustrated Martensitic Transformation in FCC Chemically Complex Alloys |
| Author(s) |
Annie Barnett, Daniel Foley, Emily Hopkins Mang, Wei-Ying Chen, Michael Falk, Mitra L. Taheri |
| On-Site Speaker (Planned) |
Annie Barnett |
| Abstract Scope |
Ferritic–martensitic (FM) steels are valued for their economic alloying strategies, oxidation resistance, and creep strength, however their performance envelope is increasingly constrained under more extreme service conditions. In contrast, FCC CCAs maintain improved strength and ductility to higher operating temperatures, in part due to the spatially varying energetic landscape which adds nuance to classic martensitic transformations routes. Using CoCrNi as a model system, we leverage in-situ ion irradiation to accelerate the nucleation of nanoscale epsilon-martensite domains within the FCC matrix. Bulk characterization of this microstructure is completed via DMA and MPMS measurements, and the resulting structural signatures are interpreted within the context of prior diffuse scattering studies. We find that the accumulation of stacking faults serve as favorable nucleation sites for epsilon-martensite embryos, producing satellite reflections and enhancing diffuse electron scattering. While these processes mirror transformations in conventional TRIP alloys, chemical fluctuations frustrate long-range martensitic transformation, confining it to nanoscale domains. |
| Proceedings Inclusion? |
Planned: |