About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
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| Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
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| Presentation Title |
Strain Hardenable and Ultrastrong Maraging Medium-Entropy Alloy |
| Author(s) |
Hyoung Seop Kim, Hyeonseok Kwon |
| On-Site Speaker (Planned) |
Hyoung Seop Kim |
| Abstract Scope |
Maraging steels, known for their ultrahigh strength and excellent fracture toughness, typically feature a lath martensite structure enriched with dense nanoprecipitates. This study introduces an innovative Fe-based medium-entropy alloy, formulated as Fe60Co25Ni10Mo5 (at%). By undergoing a brief aging process of just 10 minutes at 650 °C, the alloy forms a microstructure that includes a high density of (Fe, Co, Ni)7Mo6-type nanoprecipitates within a lath martensite matrix and a reverted FCC phase. This unique structure delivers an ultrahigh yield strength exceeding 2 GPa and an ultimate tensile strength of about 2.2 GPa, along with a uniform ductility of approximately 6%. This alloy capitalizes on the deformation-induced martensitic transformation from reverted FCC to BCC martensite, a mechanism rarely exploited in conventional maraging steels. This study presents a novel direction in creating strong and ductile materials by merging the high-entropy concept with traditional material design.
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