| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
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Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales IV
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| Presentation Title |
Multi-scale Characterization of Monotonic and Cyclic Properties of Ultra-high Strength CrCoNi Medium-entropy Alloy with Heterogeneous Partially Recrystallized Microstructure |
| Author(s) |
Milan Heczko, Veronika Mazanova, Connor E Slone, Mulaine Shih, Tomas Kruml, Maryam Ghazisaeidi, Easo P. George, Jaroslav Polak, Michael J Mills |
| On-Site Speaker (Planned) |
Milan Heczko |
| Abstract Scope |
The effect of tunable partially recrystallized (PRX) heterostructures on the monotonic and cyclic plasticity and overall performance of equiatomic CrCoNi was investigated. After specific processing steps of cold-rolling and heat-treatment the alloy was subjected to monotonic and strain-controlled cyclic tests at room temperature. 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 mechanisms and substructure evolution was studied by multi-scale electron microscopy based characterization supported by atomistic modeling and correlated with the mechanical properties. Key performance aspects associated with the gradient heterogeneous microstructure were identified. 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. |