J. Mater. Sci. Technol. ›› 2024, Vol. 202: 119-128.DOI: 10.1016/j.jmst.2024.03.009

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Hot extrusion-induced Mg-Ni-Y alloy with enhanced hydrogen storage kinetics

Xuan Suna,1, Xiaohua Yangb,1, Yangfan Luc,d, Qun Luoa,*, Chengzhang Wua, Yu Zhangd, Tao Lyue, Qinfen Guf, Qian Lia,c,d,g,*, Fusheng Panc,d   

  1. aState Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering & Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200444, China;
    bInstitut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications, J3 × 1P7 Varennes, QC, Canada;
    cNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;
    dCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
    eMaterials Genome Institute, Shanghai University, Shanghai 200444, China;
    fAustralian Synchrotron, ANSTO, 800 Blackburn Rd, Clayton, VIC, 3168, Australia;
    gNational Key Laboratory of Advanced Casting Technologies, Chongqing University, Chongqing 400044, China
  • Received:2024-02-17 Revised:2024-03-10 Accepted:2024-03-19 Published:2024-12-10 Online:2024-03-29
  • Contact: *E-mail addresses: qunluo@shu.edu.cn (Q. Luo), cquliqian@cqu.edu.cn (Q. Li).
  • About author:1These authors contributed equally to this work.

Abstract: In this work, the influence of the hot-extrusion method on the hydrogen storage kinetics of Mg-Ni-Y alloy was investigated. It was shown that the extruded Mg91.47Ni6.97Y1.56 alloy exhibits improved hydriding and dehydriding (H/D) kinetics, with a capacity of 3.5 wt.% H2 absorption within 60 s and 5.4 wt.% H2 desorption within 5 min at 573 K. The dehydrogenation activation energy of extruded alloy is 71.4 kJ mol-1, smaller than that of as-cast alloy (140.5 kJ mol-1). The enhancement of H/D kinetics is attributed to the microstructural refinement and increased grain/phase boundaries introduced by hot extrusion, as well as the catalytic effects from the in-situ generated and grain-refined Mg2Ni and YH2 particles during the H/D process. Furthermore, the dehydrogenated rate-determining step transforms from hydrogen diffusion in the hydride (as-cast alloy) to the surface penetration of hydrogen atoms (extruded alloy). These findings provide crucial insights for the design of Mg-based hydrogen storage alloys in the future.

Key words: Mg-based hydrogen storage alloys, Mg-Ni-Y alloy, Hydrogen storage kinetics, Hot-extrusion