Influence of Fe content on the microstructure and hydrogen storage properties of Ti_(16)Zr_5Cr_(22)V_(57-x)Fe_x (x = 2-8) alloys

摘要

The influence of Fe content on the microstructure and hydrogen storage properties of Ti_(16)Zr_5Cr_(22)V_(57-x)Fe_x (x = 2-8) alloys was investigated systematically. The results show that all alloys consist of a BCC main phase and a small amount of C14 Laves secondary phase. The crystal lattice parameters of the BCC main phase in the alloys decrease with the increase of the Fe content. Under moderate conditions, all the alloys have good activation behaviors and hydriding/dehydriding kinetics. As the x increases, the hydrogen desorption plateau pressure of the alloys increases consequently. Among the studied alloys, Ti_(16)Zr_5Cr_(22)V_(55)Fe_2 alloy has suitable hydrogen desorption plateau pressures indicated by the middle value of pressure range. (0.1-1 MPa) at 298 K and the best overall hydrogen storage properties.