| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Friction Stir Welding and Processing XI
|
| Presentation Title |
Heterogeneous Structure-induced Strength-ductility Synergy by Partial Recrystallization during Friction Stir Welding of a High-entropy Alloy |
| Author(s) |
Po-Ting Lin, Hung-Chi Liu, Po-Ying Hsieh, Cheng-Yu Wei, Che-Wei Tsai, Yutaka Sato, Shih-Che Chen, Hung-Wei Yen, Nian-Hu Lu, Chih-Hsuan Chen |
| On-Site Speaker (Planned) |
Hung-Chi Liu |
| Abstract Scope |
To apply high-entropy alloys (HEAs) for extensive advanced structural uses, their welding properties should be well understood. In this study, Al0.3CoCrCu0.3FeNi HEA was butt welded by friction stir welding (FSW). The partially recrystallized fine-grained microstructure in the stir zone gave rise to a high tensile yield strength of 920 MPa with an elongation of 37%. By microstructural observation, the excellent mechanical properties of the stir zone material were attributed to the partially recrystallized heterogeneous structure, with which the synergetic strengthening improved the strength of the HEA with considerably less trade-off in its ductility. This unique phenomenon was unprecedented in any other FSWed conventional alloys and was credited to the low stacking-fault energy and the high grain growth activation energy of the HEA. This work suggests that FSW can not only produce good HEA welds but serve as a special processing technique to enhance mechanical properties of HEAs. |
| Proceedings Inclusion? |
Planned: |