About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
Presentation Title |
Influence of Hydrogen on the Low Cycle Fatigue Behavior of the Equiatomic CrMnFeCoNi High Entropy Alloy |
Author(s) |
Dayane Marques Oliveira, Christopher W. San Marchi, Easo P. George, Jeffery C. Gibeling |
On-Site Speaker (Planned) |
Dayane Marques Oliveira |
Abstract Scope |
True plastic strain-controlled low cycle fatigue (LCF) tests were performed on the CrMnFeCoNi high-entropy alloy in the non-charged and hydrogen-precharged (H-precharged) conditions. Internal hydrogen increases the cyclic strength of this alloy at all plastic strain amplitudes by enhancing the effective component of the flow stresses. These effective stresses are greater than back stresses for all tested conditions. Furthermore, the evolution of back stresses during LCF testing at different strain amplitudes is not influenced by the presence of hydrogen, suggesting that the dislocation structures are similar in non-charged and H-precharged conditions. Primary fatigue crack(s) initiate earlier in the H-precharged than in the non-charged condition, and the presence of hydrogen severely reduces the LCF lifetime of this alloy. Fracture surface observations reveal that, although plastic deformation processes are active in the H-precharged condition, hydrogen leads to intergranular failure in the CrMnFeCoNi alloy. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Environmental Effects |