Phase transformations in titanium hydrides

Schur, D. V.; Zaginaichenko, S. Yu.; Adejev, V. M.; Voitovich, V. B.; Lyashenko, A.A.; Trefilov, V. I.

doi:10.1016/s0360-3199(96)00058-4

Cited by 51 publications

(12 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8). This may suggest that the 650 o C peak corresponds to the extraction of hydrogen from the decomposed hydride phase, in agreement with the suggestions done in [6,11]. However, the 650 o C peak has been observed on the extraction spectra at polarization lower than that corresponding to the formation of hydride phase, cf.…”

Section: Discussionsupporting

confidence: 89%

“…The formation of extraction peak at 550-650 0 C has been accounted in [6,11] for the dissolution of hydride. The broadening of the peak and its shift to the lower temperature have been explained by the extraction of hydrogen trapped by the structural defects of high concentration.…”

Section: Discussionmentioning

confidence: 99%

“…At the higher amount of absorbed hydrogen, the TiH x hydride of the fcc structure is formed [1 -3, 5 -7]. Increase in the hydrogen content in that hydride causes the increase in its lattice parameter from about 4.407Å at x = 1.5 to 4.434 Å at x =1.9 [7] and to 4.44 [2] -4.45 Å [6] at x=2. However, the formation of the tetragonal structure of TiH 2 hydride with the lattice parameters a = 3.12 Å and c = 4.18 Å.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydride Formation at Cathodic Charging of α-Ti

Łunarska¹,

Chernyayeva²,

Lisovytskiy³

2008

Advances in Materials Sciences

View full text Add to dashboard Cite

The hydrogen absorption and the formation of the hydride phase at cathodic polarization of annealed α-Ti have been studied by the kinetic hydrogen extraction and by the X-ray diffraction methods. The electrochemical parameters of cathodic hydrogen charging have been selected in order to obtain the hydrogen present in the solid solution of α-Ti lattice and the hydride phase to be formed. In 2M NaOH solution, the hydride phase has been already formed at cathodic polarization lower than 1 mA/cm 2 . In the case of 0.1M NaOH, the polarization regions (i) of hydrogen dissolution in the solid phase (ii) of hydride precipitation and (iii) of formation the increased amount of hydride phase have been distinguished in the course of application of increased cathodic polarization. Hydrogen dissolved in the metal lattice produces its dilatation, whereas presence of hydride phase causes the contraction of Ti lattice. Increased cathodic polarization causes the increase it the amount of hydride phase and the increase in the hydrogen content in TiH X phase as well.

show abstract

Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydride Formation at Cathodic Charging of α-Ti

Łunarska¹,

Chernyayeva²,

Lisovytskiy³

2008

Advances in Materials Sciences

View full text Add to dashboard Cite

show abstract

“…The archetypical structural transition upon creating a hydride is the formation of a FCC lattice in the fully hydrogenated form (MH 2 ). However for intermediate hydrogen content, a distorted BCC phase has been observed in many transition metal-hydrogen systems (BCC → distorted BCC (BCT) → FCC)31920. This type of lattice distortion, illustrated in Fig.…”

Section: Discussionmentioning

confidence: 94%

Superior hydrogen storage in high entropy alloys

Sahlberg

Karlsson

Zlotea

et al. 2016

Sci Rep

293

195

View full text Add to dashboard Cite

Metal hydrides (MHx) provide a promising solution for the requirement to store large amounts of hydrogen in a future hydrogen-based energy system. This requires the design of alloys which allow for a very high H/M ratio. Transition metal hydrides typically have a maximum H/M ratio of 2 and higher ratios can only be obtained in alloys based on rare-earth elements. In this study we demonstrate, for the first time to the best of our knowledge, that a high entropy alloy of TiVZrNbHf can absorb much higher amounts of hydrogen than its constituents and reach an H/M ratio of 2.5. We propose that the large hydrogen-storage capacity is due to the lattice strain in the alloy that makes it favourable to absorb hydrogen in both tetrahedral and octahedral interstitial sites. This observation suggests that high entropy alloys have future potential for use as hydrogen storage materials.

show abstract

“…Unlike on carbon and stainless steels, the mechanism of hydrogen degradation on a-titanium alloys involves hydrogen absorption leading to hydride formation [5][6][7][8][9][10]. Hydrogen has a low solubility in the a-phase at room temperature (about 20-100 lg g À1 ), and hydrogen-induced cracking (HIC) occurs when the hydrogen content exceeds the critical concentration at which the precipitation of brittle titanium hydrides in the a-phase, but primarily along the grain boundaries, takes place [11,12].…”

Section: Introductionmentioning

confidence: 99%