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

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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 des-orption 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 mol1).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.

Mg-based hydrogen storage alloysMg-Ni-Y alloyHydrogen storage kineticsHot-extrusion

Xuan Sun、Xiaohua Yang、Yangfan Lu、Qun Luo、Chengzhang Wu、Yu Zhang、Tao Lyu、Qinfen Gu、Qian Li、Fusheng Pan

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State Key Laboratory of Advanced Special Steel & School of Materials Science and Engineering & Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University,Shanghai 200444,China

Institut National de la Recherche Scientifique-Énergie Matériaux et Télécommunications,J3×1P7 Varennes,QC,Canada

National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China

College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

Materials Genome Institute,Shanghai University,Shanghai 200444,China

Australian Synchrotron,ANSTO,800 Blackburn Rd,Clayton,VIC,3168,Australia

National Key Laboratory of Advanced Casting Technologies,Chongqing University,Chongqing 400044,China

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2024

10.1016/j.jmst.2024.03.009

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.202(35)