About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Observing hydrogen trapping in a L12-precipitate-strengthened CoCrNi(TiAl) alloy |
| Author(s) |
Eason Yi-Sheng Chen |
| On-Site Speaker (Planned) |
Eason Yi-Sheng Chen |
| Abstract Scope |
Hydrogen embrittlement (HE) poses a significant challenge to the safe operation of metallic components in hydrogen-rich environments. Coherent nanoprecipitation offers a promising strategy to mitigate HE while enhancing strength and ductility. This study examines hydrogen trapping in L12-Ni3(Al, Ti) coherent nanoprecipitates within CoCrNi multi-principal-element alloys using deuterium pre-charged cryogenic atom probe tomography, aberration-corrected transmission electron microscopy, and density functional theory calculations. Our results reveal that hydrogen predominantly accumulates within the octahedral interstitial sites of L12 (γʹ-type) precipitates, driven by their highly negative hydrogen solution energy. This trapping mechanism, distinct from precipitate interface or matrix accumulation, offers simultaneous alloy strengthening and low HE susceptibility, overcoming the traditional strength-HE resistance trade-off. These insights guide the design of high-strength, HE-resistant alloys for hydrogen-rich environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Characterization, Sustainability |