The Ti
2Cu interaction with hydrogen is determined to be possible in the destructive hydrogenation (DH) region. The Ti
2Cu DH process is realized at the temperatures 373, 473, 573, 773 and 973 K. Its ...products were titanium dihydride and copper-rich with regard to Ti
2Cu intermetallic phases as well as the copper against the absorbed hydrogen amount. The mechanism of the Ti
2Cu destructive hydrogenation consists in the following: hydrogen selectively interacts with titanium which leaves from the Ti
2Cu composition, according to the scheme: β-TiH
y (bct-bcc) → TiH
1,92 (fcc). The copper-riched intermetallic phases form after such titanium amounts leaves from Ti
2Cu composition which support the formation of a new Ti:Cu stoichiometric ratio according to the Ti–Cu state diagram.
The recombination of Ti
3Al from the products of its destructive hydrogenation (α-TiH
x, β-TiH
y, TiH
1,9c, TiH
2t, TiAl
2 and TiAl
3) was investigated. The recombinated composition Ti
3Al was ...obtained. It was microscopically determined to be the ordered alloy with the domain structure, which cross-sectional dimension changed from 70 to 200 nm. The hardness of Ti
3Al recombinated enhanced in comparison with the initial Ti
3Al on 40%.
Materials processed by the destructive hydrogenation and recombination was used for the detonation spraying of the coats. These coats are characterized by the low content of the embritting phases and by the narrowing or absence of the borders between single layers and between coat and substrate. The coats from the powders processed in hydrogen have the cohesive resistance with the substrate twice as much, than the coat from Ti
3Al powder obtained by the mechanical crushing of the ingot.
Ti 3Al destructive hydrogenation Bratanich, Tatiana I.; Skorokhod, Valeriy V.; Kopylova, Lyudmila I. ...
International journal of hydrogen energy,
2011, Letnik:
36, Številka:
1
Journal Article
Recenzirano
In the present paper it was determined, that interaction between α
2-Ti
3Al alloy and hydrogen in temperature range between 298 and 1533 K is performed in accordance with the reaction of the ...destructive hydrogenation and its products are titanium hydrides and intermetallic compounds Al-enriched in comparison with Ti
3Al. The structurally-phasemechanism of α
2-Ti
3Al destructive hydrogenation consists in the following. From the beginning solution of hydrogen in Ti
3Al leads to disordering of its crystalline structure. Then hydrogen interacts not with the disordered alloy, but with titanium, which goes out from Ti
3Al, accordingly to the scheme:
TiH
2(bct) → TiH
1,9(fcc) → β-Ti-H
y
(bcc) → α-Ti-H
x
(hexagonal) → α-Ti (hexagonal).
The intermetallic compounds with the enhanced aluminum content are arised, when suitable stoichiometric concentrations are formed. The monolithic composites with nano-size components were obtained by means of Ti
3Al destructive hydrogenation at 973 K during 1 and 4 h. Their phase compositions were Ti
3Al-(α-TiH–Ti
3−
x
Al) and ((α-Ti-H
x
)–(β-Ti-H
y
)–TiH
1,9(fcc)–TiH
2(bct))–(Ti
3Al–TiAl–TiAl
2) correspondingly. These composites consist of continuous matrixes and inclusions situated in them.
