About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Flipping Weld Performance in Multi-Principal Element Alloys at Cryogenic Temperatures via Multi-Scale Heterogeneity |
| Author(s) |
Yoona Lee, Jeong Min Park, Dongwon Shin, Wei Xiong, Marcia Myung Hye Ahn, Namhyun Kang |
| On-Site Speaker (Planned) |
Namhyun Kang |
| Abstract Scope |
Welds with face-centered cubic (FCC) structure in multi-principal element alloys are inherently weaker than base metal (BM), presenting a challenge in designing reliable structural components. Despite extensive efforts to develop cryogenic structural alloys, overcoming the intrinsic weakness of the weld metal (WM) has remained elusive. Here, we introduce a new approach to achieve strong and ductile welds that surpass BMs in cryogenic conditions by manipulating multi-scale heterogeneity. We counterintuitively exploit compositional inhomogeneity and spatial microstructural heterogeneity-often regards as detrimental in welding-to control the metastability of the FCC phase in ferrous alloy weld. Accordingly, our welds exhibit exceptional cryogenic strength (104%) and ductility (140%) compared to BM, outperforming state-of-the-art alloys. Our study establishes a new pathway for developing strong and ductile welds for cryogenic structural materials where welding is indispensable across various industries such as energy, aerospace, and marine engineering. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Joining, Phase Transformations, Other |