热处理对Ti18Cr24V55Zr3合金吸放氢性能的影响

引言 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.

Effects of heat treatment on hydriding/dehydriding characteristics of Ti18Cr24V55Zr3 alloy

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 as-cast 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℃.