About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Advances in Multi-Principal Element Alloys V: Mechanical Behavior
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| Presentation Title |
Bi-continuous W-rich Refractory High Entropy Alloy-Cu Composite: Toward material innovation of nuclear reactor coolant system |
| Author(s) |
Kook Noh Yoon , Il Hwan Kim , Ji Young Kim , Peter Hosemann , Eun Soo Park |
| On-Site Speaker (Planned) |
Eun Soo Park |
| Abstract Scope |
Refractory high-entropy alloys(RHEAs) are considered promising candidate materials for next-generation nuclear reactors. However, the significant positive heat of mixing between refractory elements and Cu, commonly used in cooling systems, poses challenges in forming composite structures. This study addresses the issue using a liquid metal dealloying(LMD) process. A precursor alloy(WTaVTi) with a directional dendrite-interdendrite structure was fabricated and reacted with molten Cu. This approach produced a RHEA-Cu composite with a stable interface, featuring a spontaneously formed W-rich interlayer that enhances interfacial bonding. The composite showed excellent irradiation resistance, with 30% less swelling under α-ion irradiation than pure W. It also exhibited low thermal conductivity at room temperature, but reached ~120 W/m·K at ~650°C, surpassing pure W. The large-scale reaction and stable microstructure achieved through LMD process highlight its industrial potential. This work offers a strategy for developing high-performance materials by combining RHEA's radiation resistance with Cu's thermal conductivity for extreme environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Composites, Phase Transformations |