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 |
Tensile and Fracture Toughness Behavior of Refractory High-entropy Alloys at Temperatures from Ambient to 1200°C |
Author(s) |
Punit Kumar, David H. Cook, Madelyn Payne, Wenqing Wang, Pedro Borges, Mingwei Zhang, Eun Soo Park, Yi Li, Andrew M. Minor, Mark Asta, Robert Ritchie |
On-Site Speaker (Planned) |
Punit Kumar |
Abstract Scope |
The refractory high-entropy alloys (RHEAs) show remarkable compressive strength up to temperatures exceeding 1200 °C. However, their fracture behavior under tension remains largely unexplored. We examine RHEAs tensile and fracture behavior at ambient (RT) to 1200 °C temperatures. For this study, two single-phase bcc RHEAs, NbMoTaW and a group IV enriched alloy, brittle and ductile at RT, respectively, were selected along with a precipitation-hardened RHEA analogous to superalloy (Al0.5Nb1.25Ta1.25TiZr). NbMoTaW exhibits a transition from transgranular fracture at room temperature to an intergranular fracture at 1200 °C. However, fracture toughness remains invariant to temperature. In comparison, the ductile single-phase RHEA shows remarkable fracture resistance at all temperatures. The Al0.5Nb1.25Ta1.25TiZr shows an intergranular fracture behavior at all temperatures with a fracture toughness of ⁓15 MPam at RT and <10 MPam at all temperatures above 800 °C. In this presentation, the microstructural origin of these mechanical properties will be discussed in detail. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |