Effects of temperature change and hydrogen content on titanium hydride crystal lattice volume*1

Trefilov, V. I.; Timofeeva, I. I.; Klochkov, L.I.; Morozov, I. A.; Morozova, R.A.

doi:10.1016/s0360-3199(96)00078-x

Cited by 17 publications

(9 citation statements)

References 6 publications

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“…The integrity of the wrapped foil was shown to be adequate in all trials except the 30% atomic case in which the distortion of both the plate and foil during the alloying process led to severe cracking and fracture of the outer foil. This was attributed to the macroscopic distortion related to lattice changes during cooling in which the bcc β phase transforms to the α + β and subsequent α + δ phases as was discussed in previous studies [40][41][42]. Nevertheless, even with the failed integrity of the titanium foil in this case, the overall sheet and foil demonstrated uniform absorption of hydrogen as determined from the individual mass increases.…”

Section: Controlled Alloying Of Titanium Sheet With Hydrogensupporting

confidence: 56%

Temporarily alloying titanium to facilitate friction stir welding

Hovanski

2009

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Section: Controlled Alloying Of Titanium Sheet With Hydrogensupporting

confidence: 56%

Temporarily alloying titanium to facilitate friction stir welding

Hovanski

2009

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“…In the literatures, 1,2,[13][14][15] there are different explanations of the phenomenon. Trefilow et al 14) indicates that hydrogen atom placed into different places in the TiH 2 lattice, namely octahedral and tetrahedral holes in -TiH 2 . 13,14) The hydrogen atoms in octahedral holes can easily migrate because the bonding in octahedral sites is weaker than that in tetrahedral ones.…”

Section: Resultsmentioning

confidence: 99%

“…Trefilow et al 14) indicates that hydrogen atom placed into different places in the TiH 2 lattice, namely octahedral and tetrahedral holes in -TiH 2 . 13,14) The hydrogen atoms in octahedral holes can easily migrate because the bonding in octahedral sites is weaker than that in tetrahedral ones. 15) Therefore, during heating the hydrogen atoms from the octahedral positions would be released first and the hydrogen from the tetrahedral ones should leave later.…”

Section: Resultsmentioning

confidence: 99%

Heat Treatment of TiH<SUB>2</SUB> Powder to Control Decomposition Phenomenon for Aluminum Foam Fabrication by Melt Route

2009

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TiH 2 powder has been used to fabricate aluminum foams as a blowing agent for more than two decades. The aim of this paper is to understand the detailed decomposition behavior of TiH 2 powder and to control the phenomenon by a heat treatment for the fabrication of fine aluminum foams by the melt route. TiH 2 powders whose qualities were different, were characterized using TG-DTA and XRD. As heat treatment factors, temperature and time were applied. We have found differences in the decomposition behavior between the as-received TiH 2 powders. Regardless of quality of TiH 2 powder, increasing temperature and time of the heat treatment in air elevates the decomposition temperature and decreases the amount of released hydrogen during reheating due to the oxide barrier layer formed on the powder surface. The influence of the heat treatment temperature on the decomposition modification is more significant than that of the time. To control the decomposition phenomenon of TiH 2 powder, the heat treatment condition has to be optimized taking into account the quality and the purity of the powder.

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“…[8] has been also reported [3,7,8]. Most studies have showed that hydrogen occupies the tetrahedral holes in hydride [1 -3, 6], whereas the occupation of the both, tetrahedral and octahedral sites (depending on the hydrogen content and temperature) has been also suggested [9].…”

Section: Introductionmentioning

confidence: 94%

“…However, due to the difference in the lattice volume of both phases [7,9] the stresses have been introduced into the metals [10,11] and into the hydride [4]. Defects formed in Ti at the hydride precipitation provide the trapping sites for the hydrogen atoms [10].…”

Section: Introductionmentioning

confidence: 99%

Hydride Formation at Cathodic Charging of α-Ti

Łunarska¹,

Chernyayeva²,

Lisovytskiy³

2008

Advances in Materials Sciences

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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.

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Effects of temperature change and hydrogen content on titanium hydride crystal lattice volume*1

Cited by 17 publications

References 6 publications

Temporarily alloying titanium to facilitate friction stir welding

Temporarily alloying titanium to facilitate friction stir welding

Heat Treatment of TiH<SUB>2</SUB> Powder to Control Decomposition Phenomenon for Aluminum Foam Fabrication by Melt Route

Hydride Formation at Cathodic Charging of α-Ti

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