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Hydriding and dehydriding characteristics of nanocrystalline and amorphous Mg20-xLaxNi10(X=0-6) alloys prepared by melt-spinning 预览 被引量:1

Hydriding and dehydriding characteristics of nanocrystalline and amorphous Mg20-xLaxNi10(X=0-6) alloys prepared by melt-spinning
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摘要 In order to improve the hydrogenation and dehydrogenation performances of the Mg2Ni-type alloys,Mg was partially substituted by La in the alloy,and melt spinning technology was used for the preparation of the Mg20-xLaxNi10(x=0,2,4,6) hydrogen storage alloys. The structures of the alloys were studied by X-ray diffraction(XRD) ,scanning electron microscopy(SEM) and high-resolution transmission electron microscopy(HRTEM) . It was found that no amorphous phase formed in the as-spun La-free alloy,but the as-spun alloys containing La held a major amorphous phase. When La content x≤2,the major phase in the as-cast alloys was Mg2Ni phase,but with further increase of La content,the major phase of the as-cast alloys changed into LaNi5+LaMg3 phase. Thermal stability of the as-spun alloys was studied by differential scanning calorimetry(DSC) ,showing that spinning rate was a negligible factor on the crystallization temperature of the amorphous phase. The hydrogen absorption and desorption kinetics of the as-cast and as-spun alloys were measured using an automatically controlled Sieverts apparatus,confirming that the hydrogen absorption and desorption capacities and kinetics of the as-cast alloys clearly increased with rising La content. For La content x=2,the as-spun alloy displayed optimal hydrogen desorption kinetics at 200 °C. In order to improve the hydrogenation and dehydrogenation performances of the Mg2Ni-type alloys, Mg was partially substituted by La in the alloy, and melt spinning technology was used for the preparation of the Mg20-xLaxNi10 (x=0, 2, 4, 6) hydrogen storage alloys. The structures of the alloys were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). It was found that no amorphous phase formed in the as-spun La-free alloy, but the as-spun alloys containing La held a major amorphous phase. When La content x≤2, the major phase in the as-cast alloys was Mg2Ni phase, but with further increase of La content, the major phase of the as-cast alloys changed into LaNi5+LaMg3 phase. Thermal stability of the as-spun alloys was studied by differential scanning calorimetry (DSC), showing that spinning rate was a negligible factor on the crystallization temperature of the amorphous phase. The hydrogen absorption and desorption kinetics of the as-cast and as-spun alloys were measured using an automatically controlled Sieverts apparatus, confirming that the hydrogen absorption and desorption capacities and kinetics of the as-cast alloys clearly increased with rising La content. For La content x=2, the as-spun alloy displayed optimal hydrogen desorption kinetics at 200 ℃.
作者 张羊换 赵栋梁 任慧平 郭世海 王青春 王新林 ZHANG Yanghuan , ZHAO Dongliang , REN Huiping , GUO Shihai , WANG Qingchun , WANG Xinlin (1. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081,China; 2. School of Material, Inner Mongolia University of Science and Technology, Baotou 014010, China)
出处 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2009年第3期 514-519,共6页 Journal of Rare Earths
基金 Foundation item: Project supported by 863 Program (2006AA05Z132), the National Natural Science Foundations of China (50871050 and 50701011), Natural Science Foundation of Inner Mongolia, China (200711020703) and High Education Science Research Project of Inner Mongolia, China (NJzy08071)
关键词 熔融纺丝技术 熔融合金 非晶相 放氢 高分辨透射电子显微镜 扫描电子显微镜 纳米晶 动力学测定 Mg2Ni-type hydrogen storage alloy melt-spinning structure hydriding and dehydriding characteristics rare earths
作者简介 Corresponding author: ZHANG Yanghuan (E-mail: zyh59@yahoo.com.cn; Tel.: +86-10-62187570)
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