| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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| Presentation Title |
High-Density Nanoprecipitates and Phase Reversion via Maraging Enable Ultrastrong Yet Strain-Hardenable Medium-Entropy Alloy |
| Author(s) |
Hyeonseok Kwon, Praveen Sathiyamoorthi, Manogna Karthik Gangaraju, Alireza Zargaran, Jaemin Wang, Yoon-Uk Heo, Stefanus Harjo, Wu Gong, Byeong-Joo Lee, Hyoung Seop Kim |
| On-Site Speaker (Planned) |
Hyeonseok Kwon |
| Abstract Scope |
Maraging steels derive their superior mechanical properties from lath martensite structure and high-density nanoprecipitates. In this work, we designed a novel medium-entropy alloy with a chemical composition of Fe60Co25Ni10Mo5 (at%) by combining the characteristics of the maraging steels and the design principles of high-entropy alloys. A single-step aging of only 10 min at 650 ℃ led to a microstructure consisting of a very high number density of µ phase nanoprecipitates in the lath martensite and reverted FCC phase, which resulted in an ultrahigh yield strength of ~2 GPa. Moreover, the alloy exhibited an excellent strain hardenenability by harnessing deformation-induced martensitic transformation from the reverted FCC to BCC martensite, which has hardly been explored in conventional maraging steels. Our work demonstrates a pathway to produce strong and ductile materials by expanding the horizons of material design and overcoming the limits of conventional materials with the aid of high-entropy alloy design concept. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Entropy Alloys, Phase Transformations |