About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
Optimization of Conflicting Properties through Tailored Compositional Complexity in Refractory High Entropy Alloys |
Author(s) |
I.H. Kim, J.K. Kim, H. Oh, Eun Soo Park |
On-Site Speaker (Planned) |
Eun Soo Park |
Abstract Scope |
The strength-ductility (or thermal conductivity) trade-off is unavoidable in most conven-tional alloys due to the limited composition space. Herein, we propose a mechanism-based design strategy for the concurrent optimization of high temperature (HT) strength, room temperature (RT) ductility, and HT thermal conductivity by considering atomic size misfit for solid-solution hardening and lattice distortion, as well as valence electron concentration for shear instability. As a test case, we extend the composition space of binary W-Ta alloys to W-Ta-V-Ti-Cr refractory high entropy alloys (RHEAs). The present RHEAs (e.g., WTaVTiCr) exhibit superior HT strength (1210±43 MPa at 1073 K) and RT ductility (23.4±5.7%). Fur-thermore, we show that the thermal conductivities of the present RHEAs increase with in-creasing temperature and theoretically can reach ~40% of that of pure W at 2000 K. This work thus provides a general design rule for RHEAs that enables the effective utilization of compositional complexity for potential applications. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Phase Transformations, Mechanical Properties |