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 |
Improved Low-Cycle Fatigue Resistance and Competing Deformation Mechanisms of Chemically Optimized FCC Multi-Principal Element Alloys |
| Author(s) |
Joydeep Kundu, Wenle Xu, Daniel Salas, Bao Tran, Bibhu Prasad Sahu, Brady Butler, Raymundo Arroyave, Ibrahim Karaman |
| On-Site Speaker (Planned) |
Joydeep Kundu |
| Abstract Scope |
The present work investigates the Low-Cycle Fatigue (LCF) behavior and underlying deformation mechanisms of two novel non-equiatomic Multi-Principal Element Alloys (MPEAs) in the Al-Co-Cr-Fe-Mn-Ni-V system, computationally filtered from ~ 53,000 alloys using multi-objective, multi-constraint optimizations. Alloys were thermo-mechanically processed to exhibit recrystallized microstructures with mean equiaxed grain sizes of ~ 61-64 μm. Room temperature LCF tests under distinct strain amplitudes revealed the overall fatigue performance and cyclic plastic behavior. Fatigue-life evolution, hysteresis response, hardening/softening behavior, and monotonic tensile properties are systematically investigated. These solid-solution strengthened alloys demonstrated superior fatigue lives compared to fine-grained and precipitation-strengthened MPEAs, and higher stress responses than coarse-grained and similar grain-sized MPEAs. Multi-scale characterizations identified mechanisms, involving planar dislocation slip, martensitic transformation, deformation nanotwinning, and cluster stacking faults, collectively contributing to high UTS, strain hardening, improved cyclic strength, and fatigue lifetimes. These findings offer insights for designing next-generation structural materials with improved cyclic damage resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |