中文摘要：

研究了Ti0．096V0.864Fe0.04合金的储氢性能、热力学特性及吸放氢物相变化。研究结果表明，该舍金具有较好的吸放氢压力平台特性，合金的20℃最大吸氢量达到3．75％（质量分数），氢化物生成焓变△H°为-26．6kJ·（molH2）^-1，熵变ΔS°为-102．5J·（K·molH2）^-1。合金颗粒度、吸放氢循环次数对舍金的吸氢速度都有较大影响。该舍金具有较好的抗粉化能力，经过10次吸放氢循环后合金粉的平均粒径比吸氢前仅减小约1／5。XRD及SEM分析表明，合金未吸氢前是由单一的体心立方（BCC）结构的钒基固溶体相组成i4MPa下吸氢后生成大量面心立方（FCC）结构的Ti0．096V0.864Fe0.04H2．01和少量体心四方（BCT）结构的Ti0．096V0.854Fe0.04H0．81两种氢化物相；50℃下对0．001MPa放氢后，合金中除Ti0．096V0.864Fe0.04基BCC固溶体相外，还存在Ti0．096V0.864Fe0.04H0.81氢化物相。

英文摘要：

The hydrogen storage characteristics, thermodynamics and phase structures of Ti0.096V0.864Fe0.04 alloy were investigated systematically. The results show that the alloy has a good hydrogen absorption/desorption pressure plateau characteristics at room temperature, the maximum hydrogen absorption capacity was 3.75wt at 20℃. The thermodynamic parameters for the hydrogenation reaction of Ti0.096V0.864Fe0.04 are ΔH°=- 26.6kJ · （mol H2）^-1 and ΔS°=-102.5J · （K · mol H2）^-1. The grain size of the alloy and cycling number of hydrogen absorption/desorption affect the rate of hydrogen absorption strongly. The alloy has a good anti-pulverization behavior and the average grain size just decreases 20 percent after 10 cycles of hydrogen absorption/desorption. The XRD and SEM analysis show that the alloy consists of a single vanadium-based solid solution phase with BCC structure, and two hydrides of Ti0.096V0.864Fe0.04 H2 with FCC structure and Ti0.096V0.864Fe0.04 H1 with BCT structure form after hydrogenation.