Formation of alloys in the Ti–Nb system by hydride cycle method and synthesis of their hydrides in self-propagating high-temperature synthesis

Phase stability and mechanical properties of niobium dihydride

“…One can also observe from Table 1 that the calculated lattice parameters from the present study are in good agreement with corresponding experimental data in the literature [8,19,28,29]. For instance, the present lattice constant of the FCC phase is 4.580 Å , which matches well with the experimental values of 4.53 and 4.56 Å [8,19,28] with an error of less than 1%. In addition, the lattice constants of each modification (FCC, FCT, and FCO) of NbH 1 , NbH 1.25 , and NbH 1.5 phases with various H atomic configurations are very close to each other, suggesting that the atomic configuration of H has only a very small effect on lattice constants of NbH 1 , NbH 1.25 , and NbH 1.5 .…”

“…Moreover, the experimental lattice parameters of niobium dihydrides available in the literature are also included for the sake of comparison [8,19,28,29]. It should be indicated that the combination of the letters (a~h) in Fig.…”

“…It is well-known that the niobium dihydride NbH x (1 x 2) has several possible modifications, e.g., the facecentered orthorhombic phase (FCO, b phase) [13e15], facecentered cubic structure (FCC, d phase) [8,13,14,16,17], and face-centered tetragonal structure (FCT, g phase) [10,13,18]. Nevertheless, the concentrations and stability of these phases are still ambiguous to the materials society, as their phase boundaries in the current NbeH phase diagram are shown as dashed lines [10,13].…”

Mechanical Synthesis and Hydrogen Storage Characterization of MgVCr and MgVTiCrFe High‐Entropy Alloy

“…The body‐centered cubic (BCC) structure alloys are very attractive for hydrogen storage because their storage capacity is connected to the BCC structure which is formed from a solid solution and has a coarse packing structure with more interstitial sites for hydrogen occupancy in comparison with the face‐centered cubic (FCC) and hexagonal close packing (HCP) structures . As examples of BCC alloys already reported in literature as potential hydrogen storage systems, we could highlight TiNb, Mg–Ni, Mg–Ni–Pd, Mg–Co, Ti–V, Ti–Cr–V, Mg–V–Ni, Mg–V–Co, Mg–V–Cu, Mg–V–Ca, Mg–V–Sn, and Mg–V–Pd . When these BCC alloys are synthesized from the elemental powders by high‐energy ball milling (HEBM) techniques, nanostructured materials are achieved with a good level of mixing among the elements and enhancement of hydrogen storage properties .…”

Production of Low-Cost TiNbFe Alloys from the Elemental Powders of NbFe Pre-Alloy and Their Hydrogenation Features

“…10) The mechanisms of the alloy formation in TiNb system with prevailing ¢ phase and high density were synthesized by hydride cycle (HC) method. 11) It was shown that the alloys synthesized by HC interact with hydrogen in a combustion mode (high temperature) without crushing and form high hydrogen-content hydrides (1.993.62 wt%) leading to the formation of a FCC structure. In addition, the desorption temperature of TiNbH x hydride is sensitive to the phase composition and is lower than the desorption temperature of both TiH 2 and NbH 2 hydrides.…”