Ti_(1.0)V_xMn_(2-x)(x=0.6～1.6)合金的微结构和储氢性能

Microstructure and Hydrogen Storage Properties of Ti_(1.0)V_xMn_(2-x)(x=0.6～1.6)Alloys

系统研究了V替代Mn对Ti1.0VxMn2-x(x=0.6～1.6)合金的相结构及吸放氢性能的影响。研究结果表明:随着x的增加,合金由Laves和bcc两相结构逐渐变化到bcc单相结构,吸氢量也随之增加;当V含量增加到x≥1.2时,合金具有bcc单相结构,合金最大吸氢量达到3.5%(质量分数),但是由于缺少脆性的Laves相,合金的活化性能变差,饱和吸氢时间也有所延长;随着V含量的增加,合金主相bcc相晶胞体积增大,从而导致合金PCT曲线平台压力降低,滞后效应也逐渐增大,但平台趋向于平缓。

The effects of the substitution of Mn with V in the Ti1.0VxMn（2-x）（x=0.6～1.6） alloys on the microstructure and hydrogen storage properties were investigated. It was found that the alloys transform from a composition of two phases （Laves and bcc phases） into a single bcc phase gradually as x increasing,. The alloys with V content of x≥1.2 consist of V-based solid solution with single bcc phase when the maximum hydrogen absorption capacity of 3.5wt.% was achieved. However, its activation properties degrade and the hydrogenation saturation time is prolonged due to the lack of the brittle Laves phase. Moreover, the cell volume of the bcc phase expand with the increase of the V content, resulting in the significant decrease of plateau hydriding/dehydriding, but the plateau pressure become flatter.