| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-51: Metastability Engineering of Partially Recrystallized C-doped Non-equiatomic CoCrFeNiMo Medium-entropy Alloy |
| Author(s) |
Hyeonseok Kwon, Alireza Zargaran, Peyman Asghari-Rad, Eun Seong Kim, Gang Hee Gu, Jungwan Lee, Jongun Moon, Jae Wung Bae, Hyoung Seop Kim |
| On-Site Speaker (Planned) |
Hyeonseok Kwon |
| Abstract Scope |
Ferrous medium-entropy alloys (FeMEAs) are coming into attention these days for their excellent cost-effectiveness and mechanical properties owing to FCC-to-BCC deformation-induced martensitic transformation (DIMT). However, the FeMEAs usually possess low yield strength compared with high tensile strength and ductility. In this study, partially recrystallized microstructure consisting of coarse non-recrystallized grains with profuse mechanical twins and ultrafine recrystallized grains is presented as a solution to the problem. Nanosized M23C6-type and M6C-type carbides were also precipitated. Dislocation strengthening, precipitation strengthening, grain boundary strengthening, and twin boundary strengthening significantly improved strength of the partially recrystallized FeMEA. In addition, transformation-induced plasticity effect from the FCC-to-BCC DIMT activated by BCC nucleation at defects within the non-recrystallized grains effectively enhanced the work hardenability, leading to excellent strength and ductility. This study provides an insight to optimize the microstructure and corresponding mechanical properties of metastable metallic materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |