About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
Deformation and Failure of TiZrNbHfTa Refractory High-Entropy Alloys |
| Author(s) |
Bernd Gludovatz, William Carpenter, Moses J. Paul, Jamie J. Kruzic, Easo P. George |
| On-Site Speaker (Planned) |
Bernd Gludovatz |
| Abstract Scope |
The BCC-structured TiZrNbHfTa high-entropy alloy (HEA) combines strength and corrosion-resistance, making it a candidate material for use in a nuclear reactor or high-temperature applications. While reported fracture toughness values above 200 MPa.m0.5 place this HEA among the most damage-tolerant materials to date, a drop to ~38 MPa.m0.5 for material with a nano-crystalline microstructure, and values of ~70-90 MPa.m0.5 for equiatomic NbTaTiHf at cryogenic and at elevated temperatures, bring to question how factors such as grain size and chemical composition impact mechanical performance. Here, we present our work on evaluating the damage-tolerance of the equiamotic TiZrNbHfTa HEA compared to non-equiatomic derivates with different ratios of HCP to BCC elements. We assess both the alloys’ strength and resistance to the initiation and propagation of a crack at room temperature and discuss how test configurations and failure mechanisms correlate with the obtained fracture toughness values that range between ~100-200 MPa.m0.5. |
| Proceedings Inclusion? |
Undecided |