球磨改性处理对Ti9.6Cr11V75.4Fe4合金储氢性能的影响

系统研究了机械球磨改性处理时间(t=0,1,2,4,8 h)对Ti9.6Cr11V75.4Fe4合金相结构和储氢性能的影响.XRD及扫描电镜分析表明,Ti9.6Cr11V75.4Fe4合金在球磨前后均为体心立方结构的固溶体单相,随着球磨时间的增加,合金的晶胞体积略微减小,合金颗粒逐渐细化并发生团聚.储氢性能测试表明,球磨改性处理能有效地改善合金的活化性能,随着球磨时间的增加,合金的室温可逆有效储氢量先增加后降低.其中,当球磨时间为2 h时,合金具有最佳的综合储氢性能,其室温最大吸氢量(质量分数)为3.7%,可逆有效储氢量(质量分数)为2.23%.

Influence of Ball-Milling on Hydrogen Storage Properties of Ti9.6V75.4Cr11Fe4 Alloy

The changes in phase structure and hydrogen storage properties of Ti9.6Cr11V75.4Fe4 alloy after modification by ball-milling for different time(t=0,1,2,4,8 h) are systematically investigated.The XRD and SEM analyses show that all of the as-cast and ball-milled alloys consist of a single V-based solid solution phase with BCC structure.The cell volume and the particle size decrease gradually and the powder appears aggregation with the increasing ball-milling time.It is found that the ball-milling enables to improve the activation behavior of Ti9.6Cr11V75.4Fe4 alloy effectively.With the increasing ball-milling time,the effective hydrogen storage capacity at room temperature increases first and then decreases.Ti9.6Cr11V75.4Fe4 alloy ball-milled for 2 h is endowed with fine overall properties,whose maximum hydrogen absorption capacity and effective hydrogen storage capacity at room temperature approach to 3.7% and 2.23%,respectively.