| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-27: Dynamic Precipitate Transformation in Ultrastrong and Ductile Maraging Medium-entropy Alloy |
| Author(s) |
Hyun Chung, Won Seok Choi, Hosun Jun, Pyuck-Pa Choi, Heung Nam Han, Won-Seok Ko, Seok Su Sohn |
| On-Site Speaker (Planned) |
Hyun Chung |
| Abstract Scope |
High strength and ductility are structural materials’ basic and indispensable features under extreme conditions. Over the past two decades, numerous investigations for high-/medium-entropy alloys have been made due to their outstanding mechanical properties and rapidly increased. However, design strategies for precipitate-strengthened or martensitic MEA/HEA are not well established. Here, we investigated FeCo-based precipitate-strengthened martensitic MEA with ultrahigh strength with sufficient ductility overcoming the strength-ductility trade-off relationship based on designing metastable precipitates. The so-called maraging process introduces two types of ordered-structure precipitate with narrow stability gap; one within the matrix as an efficient dislocation barrier and a dislocation glide media; another along the grain boundary, which goes through dynamic phase transformation under load. These effects result in doubled strength and ductility, thus suggesting an alloy design strategy for further development of ultra-high strength materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, |