Structure and hydrogen storage characteristics of as-spun Mg-Y-Ni-Cu alloys
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第8期
论文作者：Yanghuan Zhang Pengpeng Wang Zhonghui Hou Zeming Yuan Yan Qi Shihai Guo
文章页码：1727 - 1734
摘 要：Experimental alloys with compositions of Mg25-xYxNi9Cu（x=0,1,3,5,7）have been successfully prepared through melt spinning method.The phase compositions and microstructures were measured by X-Ray diffraction（XRD）and high-resolution transmission electron microscopy（HRTEM）.The de-/hydrogenation properties were measured by utilizing Sievert apparatus,differential scanning calorimetry（DSC）and thermal gravimetric analyzer（TGA）connected with a H2 detector.The Arrhenius and Kissinger methods were adopted to calculate their dehydrogenation activation energies.The results show that hydrogen absorption kinetics of the alloys notably decline while their hydrogen desorption kinetics conspicuously improve with spinning rate increasing.The dehydrogenation activation energy markedly decreases with spinning rate increasing,which makes the hydrogen desorption kinetics improve.The thermodynamic parameters（H and S absolute values）clearly decrease with spinning rate increasing.The hydrogen absorption capacity exhibits different trends with spinning rate rising.Specifically,hydrogen absorption capacity increases at the beginning and declines later for Y1 alloy,but that of Y7 alloy always decreases with spinning rate growing.
Yanghuan Zhang1,2，Pengpeng Wang1,2，Zhonghui Hou1,2，Zeming Yuan1,2，Yan Qi2，Shihai Guo2
1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology2. Department of Functional Material Research,Central Iron and Steel Research Institute
摘 要：Experimental alloys with compositions of Mg25-xYxNi9Cu（x=0,1,3,5,7）have been successfully prepared through melt spinning method.The phase compositions and microstructures were measured by X-Ray diffraction（XRD）and high-resolution transmission electron microscopy（HRTEM）.The de-/hydrogenation properties were measured by utilizing Sievert apparatus,differential scanning calorimetry（DSC）and thermal gravimetric analyzer（TGA）connected with a H2 detector.The Arrhenius and Kissinger methods were adopted to calculate their dehydrogenation activation energies.The results show that hydrogen absorption kinetics of the alloys notably decline while their hydrogen desorption kinetics conspicuously improve with spinning rate increasing.The dehydrogenation activation energy markedly decreases with spinning rate increasing,which makes the hydrogen desorption kinetics improve.The thermodynamic parameters（H and S absolute values）clearly decrease with spinning rate increasing.The hydrogen absorption capacity exhibits different trends with spinning rate rising.Specifically,hydrogen absorption capacity increases at the beginning and declines later for Y1 alloy,but that of Y7 alloy always decreases with spinning rate growing.
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