Hydrogen storage performance and phase transformations in as-cast and extruded Mg-Ni-Gd-Y-Zn-Cu alloys
No Thumbnail Available
Date
2023-04-18
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Thermal-mechanical processing of magnesium-based materials is an effective method to tailor the hydrogen storage performance. In this study, Mg-Ni-Gd-Y-Zn-Cu alloys were prepared by Direct Chill (DC) casting, with and without extrusion process. The influences of microstructure evolution, introduced by DC casting and thermal-mechanical processing, on the hydrogen storage performance of Mg-Ni-Gd-Y-Zn-Cu alloys were comprehensively explored, using analytical electron microscopy and in-situ synchrotron powder X-ray diffraction. The result shows that the extruded alloy yields higher hydrogen absorption capacity and faster hydrogen ab/desorption kinetics. As subjected to extrusion processing, the α-Mg grains in the microstructure were significantly refined and a large number of 14H type long-period stacking ordered (LPSO) phases appeared on the α-Mg matrix. After activation, there were more nanosized Gd hydride/Mg2Ni intermetallics and finer chips. These modifications synergistically enhance the hydrogen storage properties. The findings have implications for the alloy design and manufacturing of magnesium-based hydrogen storage materials with the advantages of rapid mass production and anti-oxidation. © 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Description
Keywords
Magnesium alloys, Hydrogen storage, Grain refinement, Synchrotrons, X-ray diffraction, Materials
Citation
Yao, H., Zeng, G., Tan, X. F., Gu, Q., Nogita, K., Guo, J., & Li, Q. (2023). Hydrogen storage performance and phase transformations in as-cast and extruded Mg-Ni-Gd-Y-Zn-Cu alloys. Journal of Materials Science & Technology, 151, 162-177. doi:10.1016/j.jmst.2022.12.015