|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P11: Fracture and Fatigue Resistance of High Entropy Alloys
||John J. Lewandowski, Mohsen Seifi, Peter K Liaw
|On-Site Speaker (Planned)
||John J. Lewandowski
Fracture toughness and fatigue crack growth of various high entropy alloys were determined. Two multi-phase alloys, in addition to single phase FCC Al0.3CoCrFeNi HEA were prepared and tested. Notched/fatigue precracked toughness values were significantly higher for the FCC single phase HEA compared to the multi-phase HEA and higher than those reported in the literature. Fatigue experiments exhibited high thresholds that decreased significantly with an increase in load ratio, with low Paris regime exponents. Fatigue thresholds at all R were much higher than most conventional alloys. Fatigue fracture surfaces of the multi-phase samples revealed ductile and brittle features at various regions of the fatigue curve, with some evidence of fatigue striations in the Paris regime. The FCC single-phase samples only exhibited ductile features, also with some evidence of fatigue striations in the Paris regime. The results will be compared to data obtained on other HEA’s.