On the characterization of the plane stress fracture toughness of high-entropy alloys at room and cryogenic temperatures
(2024) EMMC19 - 19th European Mechanics of Materials Conference — Location: Madrid, Spain (29.May.2024)
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- Remarkable mechanical properties have been reported in recent literature [1] for CoCrFeMnNi-based high entropy alloys (HEAs), making these HEAs potentially attractive candidates for future cryogenic applications. However, the damage and fracture behavior of HEAs has not yet been fully explored, especially at low temperature. The present study evaluates the plane-stress fracture resistance of CrMnFeCoNi and CrCoNi alloys at room and cryogenic temperatures using the essential work of fracture (EWF) method. The EWF approach is a well-adapted method for simple and efficient characterization of the fracture resistance of thin sheets made of ductile materials Stainless steels are found to exhibit an outstanding low-temperature fracture energy, reaching up to 2500 kJ/m^2, surpassing the 700 kJ/m^2 determined for HEAs. A predictive model was developed and validated experimentally in order to connect the thin sheet fracture toughness to the strain hardening capacity through separating the necking and damage work spent in the fracture process zone [2]. The insights gained from this study offer valuable guidelines for refining and optimizing metallic alloys further. [1] Laplanche, G., et al. "Reasons for the superior mechanical properties of medium-entropy CrCoNi compared to high-entropy CrMnFeCoNi." Acta Materialia 128 (2017): 292-303. [2] Hilhorst, Antoine, Pascal J. Jacques, and Thomas Pardoen. "Towards the best strength, ductility, and toughness combination: High entropy alloys are excellent, stainless steels are exceptional." Acta Materialia 260 (2023): 119280.
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Hilhorst, A., Jacques, P., & Pardoen, T. (2024). On the characterization of the plane stress fracture toughness of high-entropy alloys at room and cryogenic temperatures. EMMC19 - 19th European Mechanics of Materials Conference, Madrid, Spain. https://hdl.handle.net/2078.5/238809