| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Cyclic Plasticity and Fatigue Properties of Ultra-high Strength CrCoNi Medium-entropy Alloy with Heterogeneous Partially Recrystallized Microstructure |
| Author(s) |
Milan Heczko, Veronika Mazánová, Connor E Slone, Ivo Kuběna, Jiří Tobiáš, Tomáš Kruml, Easo P George, Maryam Ghazisaeidi, Jaroslav Polák, 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 was investigated. After specific processing steps of cold-rolling and heat-treatment 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. The evolution of the internal critical stresses and the effective saturated stress during cyclic loading was analyzed using a generalized statistical theory of the hysteresis loop. The deformation substructure was studied by atomic resolution electron microscopy 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 CrCoNi alloy with PRX microstructure 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, Mechanical Properties, Other |