The effect of Cr content on the structural and hydrogen storage characteristics of Ti10V80−xFe6Zr4Crx (x=0–14) alloys

Improvement of the hydrogen storage properties and electrochemical characteristics of Ti0.85VFe0.15 alloy by Ce substitution

“…The plateau corresponding to monohydride exists in the region of low pressure of the order of 10 −2 mbar, at room temperature. The two plateau region was not observed in the pressure range of this study, as resolving the two plateau region needs pressure measurements in the low pressure region [7,8,24]. As can be seen from the pressure-composition isotherm study, the length of the plateau region increases for the Ce substituted alloys as compared to that of Ce-free alloy, Ti 0.95 VFe 0.15 .…”

“…For all compositions, the plateau region is found to be <0.02 atm, which is the lowest detection limit of our set up. In general, V based BCC alloys form monohydride and dihydride phases, exhibiting two plateau region in the P-C isotherms [7,8,24]. The plateau corresponding to monohydride exists in the region of low pressure of the order of 10 −2 mbar, at room temperature.…”

Influence of heat treatment on the microstructure and hydrogen storage properties of Ti10V77Cr6Fe6Zr alloy

“…It can be seen that the maximum hydrogen absorption capacities show a rigorously direct proportion with the lattice parameters of the BCC main phase. Obviously, the phase abundance is an overwhelming part for the consideration of the hydrogen absorption capacity for the multiphase alloys [22,23,26], which is not changed distinctly in the studied samples. In the previous report [27], the maximum hydrogen absorption capacities is related to the electron concentration e/a, while the hydrogen absorption capacities are decreased after heat treatment without the change in the value of e/a.…”

“…It is well known that the partial substitution of V with other transition elements, such as Fe, Zr and Mn, is a very effective way to improve the overall hydrogen storage properties and lowering their cost of the Ti-Cr-V alloys [9,10,6,[11][12][13][14][15][16][17][18][19][20][21][22][23]. On the other hand, it was reported that the heat treatment could also impact the microstructure and hydrogen storage properties of the Ti-Cr-V alloys [3,24,25].…”

“…However, the influence of the heat treatments with the relatively lower temperature and longer time (such as 1523 K for 5 min or 1373 K for 8 h) on the microstructure and hydrogen storage properties was not reported. In this paper, the corresponding heat treatment conditions (annealed at 1523 K for 5 min and 1373 K for 8 h) were employed for Ti 10 V 77 Cr 6 Fe 6 Zr alloy which was explored and optimized in our previous work [22,23], and the influence of heat treatment on the microstructure and hydrogen storage properties of this alloy was investigated in detail.…”