About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Environmental Degradation of Multiple Principal Component Materials
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Presentation Title |
Orientation Dependency of Hydrogen-induced Cracks in Single-crystalline CrCoNi Medium-entropy Alloy |
Author(s) |
Dae Cheol Yang, Alireza Zargaran, Sang Yoon Song, Ju-Hyun Baek, Jung Wan Lee, Hyoung Seop Kim, Jin-Yoo Suh, Young Sang Na, Seok Su Sohn |
On-Site Speaker (Planned) |
Dae Cheol Yang |
Abstract Scope |
The CrCoNi medium-entropy alloy is being actively studied as a next-generation structural material due to its excellent mechanical properties, which is attributed to deformation-induced twins (DTs) by low stacking fault energy. Despite various experimental findings on the role of DTs for hydrogen embrittlement (HE), a comprehensive investigation of this mechanism has yet to be undertaken. In this study, a single-crystalline CrCoNi alloy was selected as an appropriate model alloy to reveal the correlation between deformation structure and hydrogen under four different tensile directions, i.e., [001], [011], [111], and [112]. The resistance to HE for each tensile direction was evaluated through slow strain rate tensile test after electro-chemical hydrogen charging, and the complex interplay between the DT structure and HIC was unraveled based on the in-depth analysis via SEM, TEM, and EBSD. This work suggests improved strategies for enhancing the resistance to HE and mechanical properties of next generation structural materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Environmental Effects, |