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

doi:10.1007/s40195-022-01469-5

金属学报英文版 ›› 2023, Vol. 36 ›› Issue (7): 1173-1178.DOI: 10.1007/s40195-022-01469-5

收稿日期:2022-06-16 修回日期:2022-07-22 接受日期:2022-07-31 出版日期:2023-07-10 发布日期:2023-07-04

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

Jikui Liu¹, Junhua Hou¹, Fengchao An¹, Bingnan Qian¹, Christian H. Liebscher²(), Wenjun Lu¹()

¹Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
²Max-Planck-Institut Für Eisenforschung, Max-Planck-Straße 1, 40237, Düsseldorf, Germany

Received:2022-06-16 Revised:2022-07-22 Accepted:2022-07-31 Online:2023-07-10 Published:2023-07-04
Contact: Christian H. Liebscher, Wenjun Lu

摘要/Abstract

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.

Key words: Refractory high entropy alloy, Compositionally complex hydrides, Electrochemical polishing, Phase transformation, Scanning transmission electron microscopy (STEM)/electron energy loss spectroscopy (EELS)

. [J]. 金属学报英文版, 2023, 36(7): 1173-1178.

Jikui Liu, Junhua Hou, Fengchao An, Bingnan Qian, Christian H. Liebscher, Wenjun Lu. Characterization of Compositionally Complex Hydrides in a Metastable Refractory High-Entropy Alloy[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(7): 1173-1178.

图/表 4

Fig. 1 a EBSD orienation map of RHEA after homogenization, b-d bright-field TEM images and the corresponding SAED pattern of RHEA after electrochemcal polishing, e-g HAADF-STEM images and its SAED pattern of RHEA after electrochemical polishing

Fig. 2 a HAADF-STEM image of precipitates within the matrix and the corresponding EDS elemental maps, b selected areas of ADF and the corresponding EEL spectra for both the matrix and hydride (yellow: hydride; green: matrix)

Fig. 3 Characterization of compositionally complex hydride in the RHEA: a, b HRTEM images and the corresponding fast Fourier transforms (FFTs) of BCC/FCC regions. The green dashed lines mark the phase boundaries between the BCC and FCC phases. c HRTEM image and the corresponding FFT of a twinned hydride. The parallel red dashed lines represent the Σ3 twin boundaries. d, e HRTEM images and the corresponding FFTs of the BCC/HCP/FCC regions. The blue dashed line shows the phase boundary between HCP phase and compositionally complex hydride

Fig. 4 Schematic illustration of the phase transformation and hydride formation mechanisms during electrochemical polishing. Microstructure evolutions of RHEA: a prior to electrochemical polishing, b phase transformation induced by electrochemical polishing, c hydride formation caused by electrochemical polishing

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

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