About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Hydrogen Diffusion and Twin-Assisted Embrittlement in CoCrFeMnNi High-Entropy Alloy at Cryogenic Conditions |
| Author(s) |
Junghoon Lee, Namhyun Kang |
| On-Site Speaker (Planned) |
Junghoon Lee |
| Abstract Scope |
The hydrogen embrittlement (HE) behavior of CoCrFeMnNi high-entropy alloy (HEA) was investigated through electrochemical hydrogen permeation and tensile testing at cryogenic temperatures. Hydrogen diffusion was found to occur primarily along grain boundaries at 298 K. HE-induced intergranular fracture appeared at 298 K and 177 K, while negligible embrittlement was observed at 77 K. Fracture surfaces indicated crack propagation along twin and grain boundaries, which acted as hydrogen diffusion paths and stress concentrators. Extensive twin formation at 77 K is believed to suppress localized hydrogen accumulation, enhancing HE resistance. These findings emphasize the critical role of microstructural features in HEA performance under hydrogen exposure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Environmental Effects, Other |