| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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| Presentation Title |
Fatigue Properties Versus Tunable Partially Recrystallized Heterostructures – The Case of Ultra-High Strength and Exceptional Fracture Toughness CrCoNi MPEA |
| Author(s) |
Milan Heczko, Connor E Slone, Veronika Mazánová, Punit Kumar, Qin Yu, Bryan Crossman, Jaroslav Polák, Easo P George, Robert O Ritchie, Michael J Mills |
| On-Site Speaker (Planned) |
Milan Heczko |
| Abstract Scope |
The effect of tunable partially recrystallized (PRX) heterostructures on the cyclic plasticity and overall fatigue performance of equiatomic CrCoNi multi-principal element alloy was investigated. After specific steps of thermo-mechanical processing the alloy was subjected to strain-controlled low cycle fatigue tests at room temperature in a wide interval of strain amplitudes. Fatigue hardening/softening curves, cyclic stress-strain curves and fatigue life curves were evaluated. Multi-scale electron microscopy-based characterization was used to identify critical changes in deformation substructure (including local TWIP and TRIP effects) and correlated with the cyclic response. EBSD and SEM-FIB were used to identify mechanisms leading to fatigue crack initiation and growth. It is revealed that due to the composite nature of the microstructure with non-recrystallized grains providing strength and recrystallized grains enabling plasticity, the PRX CrCoNi alloy exhibits ultra-high monotonic and cyclic strength and extraordinary fracture toughness while preserving good ductility and resistance to cyclic plastic deformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Mechanical Properties |