About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
Unraveling Mechanistic Competition during Deformation of CoCrNi Medium Entropy Alloys |
Author(s) |
Ankit Gupta, Wu-Rong Jian, Shuozhi Xu, Irene Beyerlein, Garritt J. Tucker |
On-Site Speaker (Planned) |
Ankit Gupta |
Abstract Scope |
CoCrNi medium entropy alloys (MEA) have been the subject of numerous investigations due to their unique mechanical properties such as an exceptionally high strength-ductility combination. The resulting superior toughness of CoCrNi MEAs is attributed to an interplay of multiple deformation mechanisms. However, the current understanding of MEA deformation mostly stems from an indirect analysis of the defect evolution in deformed microstructures. In this study, the mechanical response of nanocrystalline CoCrNi MEA under uniaxial tension is probed using atomistic simulations. The contributions of deformations mechanisms are resolved directly from the amount of strain accommodation by leveraging continuum based kinematic metrics. Their variations are presented as a function of grain size and local chemical ordering. The mechanistic insights obtained via tensile simulations are further explained from generalized planar fault energies. It is found that deformation occurs initially by partial dislocation slip, followed by twinning and perfect dislocation slip. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, High-Entropy Alloys |