About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Characterization of Fatigue Crack Growth Behavior in CrCoFeNi High Entropy Alloy |
Author(s) |
Wm Matthew Williams, Mitra Shabani, Garrett Pataky, Paul Jablonski |
On-Site Speaker (Planned) |
Garrett Pataky |
Abstract Scope |
Fatigue crack growth experiments were performed at room temperature on single edge notch samples of CoCrFeNi, a single phase high entropy alloy with an FCC structure. The experiments consisted of cyclic loading at load ratios of 0.05 and 0.2 and a naturally increasing stress intensity factor. Images taken during the experiment were used for DIC and to identify the crack growth rates. Displacement fields were calculated using digital image correlation and used to quantify the stress intensity factor ranges and mode II displacements. Post-mortem fractography revealed significant surface roughness and microstructural features indicating high levels of roughness-induced crack closure for low load ratios R. Fractography showed "fin-like" features and surface cracking and TEM analysis was performed for further investigation of the features. The material exhibited good fatigue crack growth resistance. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |