Ni对V55Ti20．5Cr18．1Fe6．4合金吸放氢性能的影响

Influence of Ni on Hydrogen Absorption-Desorption Performance of V55Ti20.5Cr18.1Fe6.4 Alloys

摘要:

研究了用Ni元素取代一定量V对V55Ti20．5Cr18．1Fe6．4合金结构与性能的影响。结果表明，随Ni含量的增加，合金有效吸氢量先增大后减小，放氢压力增大，合金吸氢动力学性能也是先有所改善，而后又变差。添加0．1at％Ni有利于改善基体合金V55Ti20．5Cr18．1Fe6．4的吸放氢性能。用Ni元素取代V引起的晶胞体积的变化、放氢平台压力的升高以及杂质相的出现，是影响合金有效吸氢量和吸氢动力学性能的主要因素。

Abstract:

The structure and properties of V55Ti20.5Cr18.1Fe6.4 alloys were studied. It is found that with increasing Ni content, the effective hydrogen capacity increases first, and then decreases, and the hydrogen desorption pressure increases and the hydrogen absorption kinetic properties are improved first, and then decayed. The hydrogen absorption and desorption properties of V55Ti20.5Cr18.1Fe6.4 can be improved by substitution of 0.1at%Ni. The change of cell volume, the increase of hydrogen desorption pressure and the appearance of impurity phases are the main reasons influencing the hydrogen absorption and desorption properties by substitution of Ni for V for the alloy.