|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Fatigue Crack Growth Behavior of CrCoFeNi
||Wm Matthew Williams, Martha Piness, Garrett Pataky, Paul D Jablonski
|On-Site Speaker (Planned)
Equiatomic CoCrFeNi is a single phase high entropy alloy with an fcc structure. Fatigue crack growth experiments were performed at room temperature on single edge notch samples. The experiments consisted of cyclic loading in tension with multiple R-ratios and a naturally increasing stress intensity factor. Images were taken of the samples under loading, and displacement fields were calculated using digital image correlation. The sample images and displacement fields were used to determine crack length, crack closure, and the presence of Mode II displacements. At low R-ratios, post-mortem fractography revealed significant surface roughness and microstructural features indicating high levels of roughness-induced crack closure. Of particular interest were "fin-like" features on the fracture surface, and TEM analysis was performed for further investigation. The material exhibited good fatigue crack growth resistance.