铸态MgYNi合金的储氢性能（英文）

Hydrogen Storage Properties of Casting MgYNi Alloys

采用真空悬浮熔炼炉制备了Mg79YNi20和Mg77Y3Ni20两种镁基合金,系统研究了Y含量对合金结构和储氢性能的影响.结果表明,Y含量的增加显著改善了合金的吸放氢动力学,尤其是快速吸氢性能。随Y含量的增大,合金的放氢温度从567K降低到485K.将等温下吸氢量随压力变化(PCI)的数据带入Van’t hoff方程,计算得出的焓变和熵变显示,Y替代量加量的增加有效降低了合金的热力学稳定性.

The Mg-based Mg79 YNiz0 and Mg77 Ya Niz0 alloys were prepared by vacuum induction levitation melting furnace. Effect of Y substitution on the structure and gaseous hydrogen storage performance of the alloys was investigated. The results show that increasing Y content can improve hydrogen absorption kinetics,especially for fast hydrogenation of the alloys. Furthermore,increasing Y substitution lowers the initial dehydrogenation temperature from 567K to 485K. Enthalpy change of the alloys decreasing with the increasing Y substitu- tion indicates that the thermal stability of the alloys has been reduced.