| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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| Presentation Title |
Development of γ'-Strengthened Medium-Entropy Alloys with Mitigated Mechanical Instability at Extremely Low Temperatures |
| Author(s) |
Jun Seok Lee, Tae Hyeong Kim, Jungwan Lee, Young-Kyun Kim, Young-Sang Na, Jae Wung Bae |
| On-Site Speaker (Planned) |
Jun Seok Lee |
| Abstract Scope |
High-entropy alloys (HEAs) with a face-centered cubic (FCC) structure exhibit an excellent synergistic effect of fracture toughness and damage tolerance at cryogenic temperatures, suggesting their potential application in extreme environments such as cryogenic conditions. However, these alloys display discontinuous plastic flow (DPF) below a certain critical temperature, which may deteriorate the mechanical properties and reliability of the materials. Therefore, it is crucial to develop alloys that exhibit mitigated mechanical instability at cryogenic temperatures. In the present study, non-equiatomic AlCrFeNiMo medium-entropy alloys (MEAs), composed of an FCC matrix with nano-sized Ni3Al (γ′) precipitates and Mo-rich body-centered cubic phases, were introduced to demonstrate high strength and remarkably mitigated plastic instability at 4.2 K. Notably, these alloys exhibited alleviated mechanical instability (stress drop of about 40 MPa) compared to STS304L, which exhibits a higher stress drop of about 350 MPa at 4.2 K. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Other |