Abstract
Destructive hydrogenation and recombination are realized in powder and melted samples of TiNi under mild barothermal conditions (\(P_{H_2 } \) = 1.5 MPa, T = 773 K). Phase transformations during preliminary annealing, destructive hydrogenation and recombination are studied. During annealing of the original TiNi specimens with a predominantly austenitic structure and considerable internal stresses there is austenite-martensite transformation giving rise to formation of two-phase austenite-martensite titanium nickelide. During destructive hydrogenation an indestructible composite forms with Ni3Ti and (or) Ni-matrix within which there are uniformly distributed titanium hydride inclusions. The TiH2-Ni3Ti-Ni composite formed has a high hydrogen capacity compared with the original TiNi. During recombination titanium nickelide with an austentic structure is synthesized from TiH2, Ni3Ti and Ni. Here the original grain size is reduced on average by a factor of two.
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Translated from Poroshkovaya Metallurgiya, Nos. 11–12(452), pp. 87–93, November–December, 2006.
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Bratanich, T.I., Get’man, O.I., Dobrovol’skii, V.D. et al. Phase transformations and change in TiNi intermetallic compound structure during destructive hydrogenation and recombination. Powder Metall Met Ceram 45, 582–587 (2006). https://doi.org/10.1007/s11106-006-0122-x
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DOI: https://doi.org/10.1007/s11106-006-0122-x