球磨改性处理对Ti0．9Zr0．1Mn1．5合金相结构及储氢性能的影响

系统研究了Ti0．9Zr0．1Mn1．5储氢合金经不同时间（t=0min，10min，30min，60min）球磨改性处理后对其相结构及储氢性能的影响。结构分析表明，Ti0．9Zr0．1Mn1．5合金在球磨改性处理前后均由单一的六方结构的C14型Laves相组成；随着球磨时间的延长，合金粉的平均粒度减小，并出现了部分团聚现象。储氢性能测试表明，铸态合金经4次吸放氢循环后活化，室温最大吸氢量和有效放氢量分别为209．3ml／g和157．6ml／g，放氢率为75．3％；随着球磨时间的延长，合金的活化性能得到改善，室温最大吸氢量和有效放氢量均先升后降，且都在球磨30min时达到相应最高值231．4ml／g和203．8ml／g，放氢率达到88．1％。由此可见，适当的球磨改性处理能有效地改善Ti0．9Zr0．1Mn1．5合金的综合储氢性能。

Effect of Ball-Milling on the Phase Structure and Hydrogen Storage Properties of Ti0.9Zr0.1Mn1.5 Alloy

The changes in phase structure and hydrogen storage properties of Ti0.9Zr0.1Mn1.5 alloy after modification by mechanical ball-milling for different time(t = 0 min,10 min,30 min,60 min)were investigated systematically.The XRD and SEM analysis show that all of the as-cast and ball-milled alloys consist of a single C14 type Laves phase with hexagonal structure.The ball-milled alloy powders appear aggregation to some extent,the particle size decreases and the activation behaviour is improved with the increase of ball-milling time for the alloy.It is found that the as-cast alloy is activated after 4 hydriding/dehydriding cycles,and its maximum hydrogen absorption capacity and effective hydrogen desorption capacity at room temperature are 209.3 ml/g and 157.6 ml/g,respectively,and the efficiency of hydrogen desorption/absorption is 75.3%.The maximum hydrogen absorption capacity and the effective hydrogen desorption capacity increase firstly then decrease at room temperature with the maximum values of 231.4 ml/g and 203.8 ml/g at t=30 min,respectively,while,its efficiency of hydrogen desorption/absorption reaches 88.1%.This shows that the overall properties of Ti0.9Zr0.1Mn1.5 alloy can be improved effectively by ball-milling.