中文摘要：

采用高频悬浮感应熔炼方法制备（La1-xNdx）2Mg（Ni0.8Co0.15Mn0.05）9（x=0~0.3）系列合金,分析Nd部分取代La对合金的相结构、吸放氢性能和电化学性能的影响。结果表明,铸态合金的主相为具有六方CaCu5结构的LaNi5相,并存在具有立方MgCu2结构的LaNi2相以及LaMg3相。合金主相的晶格常数和晶胞体积随着Nd取代量的增加相应减小。Nd部分取代La后,合金的最大储氢容量降低,从x=0时的1.39wt%逐渐降低至x=0.3时的1.04wt%,同时吸放氢平台压升高;合金的最大放电容量从361.5mA.h/g（x=0）依次降低至352.8mA.h/g（x=0.3）,但是循环稳定性能得到改善。

英文摘要：

（La1-xNdx）2Mg（Ni0.8Co0.15Mn0.05）9（x=0-0.3）hydrogen storage alloys were prepared by inductive melting,the effects of substitution of Nd for La on the phase structure,hydrogen storage properties and electrochemical characteristics of the alloys were studied systematically.The results show that the alloys are mainly consisted of the LaNi5 phase with the hexagonal CaCu5-type structure,the LaNi2 and the LaMg3 phase.The lattice parameters and cell volumes of the component phases gradually decrease as the increase in addition of Nd content.With substitution of Nd for La,the hydrogen storage capacity and discharge capacity decrease from 1.39 wt%（x=0） to 1.04 wt %（x=0.3） and from 371.7mA·h/g（x=0） to 366.1mA·h/g（x=0.3）,respectively.However,the cycling life can be improved by Nd added.