Characterization of Compositionally Complex Hydrides in a Metastable Refractory 
High-Entropy Alloy

Liu, Jikui; Hou, Junhua; An, Fengchao; Qian, Bingnan; Liebscher, Christian; Lu, Wenjun

doi:10.1007/s40195-022-01469-5

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Characterization of Compositionally Complex Hydrides in a Metastable Refractory High-Entropy Alloy

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Liebscher, Christian
Advanced Transmission Electron Microscopy, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Liu, J., Hou, J., An, F., Qian, B., Liebscher, C., & Lu, W. (2023). Characterization of Compositionally Complex Hydrides in a Metastable Refractory High-Entropy Alloy. Acta Metallurgica Sinica (English Letters), 36(6), 1173-1178. doi:10.1007/s40195-022-01469-5.

Cite as: https://hdl.handle.net/21.11116/0000-000F-FD6F-9

Abstract

Here, we study the hydride formation in a metastable Ti-33Zr-22Hf-11Ta (at.%) refractory high entropy alloy (RHEA). Deviating to non-equiatomic compositions of RHEAs promotes the formation of transformation-induced plasticity where the body-centered cubic phase transforms to hexagonal close-packed (HCP) phase. It is found that the phase transformation capability assists the hydride formation due to the low solubility of hydrogen within the HCP phase. In this study, hydrogen is charged via electrochemical polishing and the corresponding phase transformation is activated in the metastable RHEAs. The newly formed HCP phase interacts with hydrogen to form a face-centered cubic hydride verified by electron energy loss spectroscopy. This work provides a primary exploration of the formation of compositionally complex metal hydrides in the metastable RHEAs, which are potential candidates for future hydrogen storage material design.