About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Behavior at the Nanoscale VII
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Presentation Title |
Deviations in Hall-Petch Behavior in a CrCoNi Medium Entropy Alloy |
Author(s) |
Novin Rasouli, Farid Fattahpour, Sara Kadkhodaei, Matthew Daly |
On-Site Speaker (Planned) |
Novin Rasouli |
Abstract Scope |
The CrCoNi medium entropy alloy (MEA) is a single-phase face-centered cubic solid solution that shows exceptional strength, ductility and toughness at room and cryogenic temperatures. This mechanical behavior is underpinned by a competition between deformation twinning and dislocation slip-based deformation mechanisms, which can be tuned by exploiting size effects. Based on an analysis of the available experimental data, we hypothesize that deformation twinning becomes more significant at smaller crystal sizes, leading to deviations in the Hall-Petch behavior. To test this hypothesis, we conduct nano and microhardness measurements coupled with electron backscatter diffraction analysis to correlate the deformation twinning stress with crystal size. Furthermore, we utilize CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) to parametrically study the contributions of competing plasticity mechanisms to the crystal size-dependent flow behavior. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, High-Entropy Alloys, Characterization |