Effective and back stresses evolution upon cycling a high-entropy alloy

Materials Research Letters

Ankur Chauhan¹  Fabian Knöpfle¹  Jarir Aktaa¹  Kaiju Lu¹ 

[1]Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany

关键词: High-entropy alloy;    fatigue;    effective stress;    back stress;   

DOI  :  10.1080/21663831.2022.2054667

来源: DOAJ

【 摘 要 】

We report on the effective and back stresses evolution of a CoCrFeMnNi high-entropy alloy (HEA) by partitioning its cyclic hysteresis loops. It was found that the cyclic stress response of the HEA predominantly originates from the back stress evolution. Back stress also increases significantly with increasing strain amplitude and reducing grain size. However, the change of effective stress is rather insignificant with altering cycle number, strain amplitude and grain size. This indicates that the effective stress is determined mainly by the lattice friction. Further comparisons to an austenitic steel and a medium-entropy alloy identified the origins of their peculiar cyclic strength.

【 授权许可】

Unknown