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 |
Ductile and Plastic HfTaTiNbZr Refractory High Entropy Alloys Studied with In Situ Neutron Diffraction |
Author(s) |
Lia Amalia, John Whitlow, Xuesong Fan, Nathan Grain, Eric Lass, Yanfei Gao, Ke An, Yan Chen, Dunji Yu, Peter Liaw |
On-Site Speaker (Planned) |
Lia Amalia |
Abstract Scope |
Previous study on refractory high entropy alloys (RHEAs) has revealed promissing high temperature strength among high entropy alloys (HEAs). However, some RHEAs are also found to be brittle at room temperature, hindering further mechanical processing. In this study, we chose seven different compositions of HfNbTaTiZr by calculating the gibbs free energy of transformation from body-centered-cubic (bcc) to hexagonal-close-packed (hcp) structure to obtain a ductility mechanism at room temperature. The seven compositions are HfNbTiZr, HfNbTaTiZr, HfTa0.5TiZr¸ HfNb0.5Ta0.5TiZr, HfNbTa0.5TiZr, Hf0.5NbTa0.5TiZr, and NbTa0.5TiZr. Single-peak fitting was conducted to obtain the real-time lattice strain evolution. Full profile fitting was conducted to determine the phase of the specimens. All seven compositions showed excellent compression plasticity and four compositions showed good tension ductility, while one composition displayed transformation-induced plasticity (TRIP) behavior. |
Proceedings Inclusion? |
Planned: |