中文摘要：

随着传统化石能源的逐渐枯竭以及环境污染日趋加剧，具有能量转换效率高、清洁无污染以及用途多样化的氢能正逐渐成为新世纪的重要新能源，而与氢能相关的高容量储氢材料的研究开发也日益受到人们的重视．具有体心立方（BCC）结构钒基固溶体主相的Ti-Cr-V系合金拥有较高的吸氢容量，理论储氢容量可达3．8%（质量）左右，但它也存在有效放氢量偏低、吸放氢压力滞后较大等问题．

英文摘要：

The effects of heat treatment （at 1473 K for 2 h or 6 h） on the hydriding/dehydriding characteristics of Ti18Cr24V55Zr3 alloy were investigated. The microstructure analysis showed that the ascast alloy consisted of a V-based solid solution main phase with BCC structure and a ZrCr2 secondary phase, and the alloys treated at 1473 K for 2 h and 6 h had a small amount of Ti-rich phase besides the V-based solid solution and ZrCr2 phase. It was found that the heat treatment led to an increase of the kinetics of the alloy and a slight decrease of the hydrogen absorption capacity at 20℃. However, the heat treatment increased the width and decreased the gradient of the plateau of the p-c isotherm. The result showed that the alloy treated at 1473 K for 2 h had good overall properties, such as activation behavior of 1 cycle, hydrogen absorption capacity of 394 ml·g^-1 at 20℃ and effective desorption capacity of 232 ml·g^-1 at 80℃.