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About this Abstract
Meeting	2021 TMS Annual Meeting & Exhibition
Symposium	High Entropy Alloys IX: Structures and Modeling
Presentation Title	Unique Deformation Behavior in the NbTaTiV Refractory High-entropy Alloy
Author(s)	Chanho Lee, George Kim, Yi Chou, Brianna L Musicó, Michael C Gao, Ke An, Gian Song, Yi-Chia Chou, Veerle Keppens, Wei Chen, Peter K Liaw
On-Site Speaker (Planned)	Chanho Lee
Abstract Scope	Single-phase solid-solution refractory high-entropy-alloys (HEAs) show remarkable mechanical properties, such as high yield strength with significant softening resistance at elevated temperatures. Hence, the in-depth study of the deformation behavior for body-centered-cubic (BCC) refractory HEAs is a critical issue to explore the uncovered/unique deformation mechanisms. We have investigated the elastic- and plastic-deformation behaviors of a single BCC NbTaTiV refractory HEA at elevated temperatures, using integrated experimental efforts and theoretical calculations. The in-situ neutron-diffraction results reveal a transition of the elastic-deformation feature from isotropic to anisotropic modes at elevated temperatures. The single-crystal elastic-moduli and macroscopic Young’s, shear and bulk moduli were determined from the in-situ neutron diffraction, showing the great agreement with first-principles calculations, machine-learning, and resonant-ultrasound spectroscopy results. Furthermore, the edge-dislocation-dominant plastic-deformation behavior, which is different from conventional BCC alloys, have been quantitatively described by the Williamson-Hall plot profile modeling. These results are further experimentally verified by the high-angle-annular-dark-field scanning-transmission-electron-microscopy (STEM).
Proceedings Inclusion?	Planned: TMS Journal: Metallurgical and Materials Transactions

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