Hydrogenation of Ti-Ni Powders Subjected to Mechanochemical Alloying with Titanium

• Published in: Russian physics journal Vol. 65; no. 7; pp. 1094 - 1101
• Main Authors: Abdulmenova, E. V., Buyakova, S. P., Kulkov, S. N.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01-11-2022; Springer; Springer Nature B.V
• Subjects: Alloy powders; Alloying; Condensed Matter Physics; Condensed-State Physics; Hadrons; Heavy Ions; Hydrogen; Hydrogenation; Intermetallic compounds; Lasers; Lattice parameters; Mathematical and Computational Physics; Mixtures; Nickel base alloys; Nickel compounds; Nuclear Physics; Optical Devices; Optics; Phase composition; Phases; Photonics; Physics; Physics and Astronomy; Powders; Specialty metals industry; Theoretical; Titanium; Titanium compounds; phase composition; Ti–Ni system; heat treatment; lattice parameter; titanium; mechanochemical alloying
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-022-02736-9

The regularities of formation of phase composition of the Ti–Ni powder in the process of mechanochemical alloying with titanium and its interaction with hydrogen during hydrogenation are studied. The content of titanium in powder mixtures (Ti–Ni) – Ti varied from 7 to 25 wt.%. It was found that the phase composition of the Ti–Ni powder before mechanochemical alloying was represented by the TiNi (
B
2,
B
19'), Ti
2
Ni, and Ni
3
Ti phases. After mechanochemical alloying, the (Ti–Ni) – Ti powders consisted of the TiNi (
B
2,
B
19') and Ti
2
Ni phases. It is shown that the powders after mechanochemical alloying contained two Ti
2
Ni phases, which differed in genesis and lattice parameters. Thus, the Ti
2
Ni (I) phase was present in the initial Ti–Ni powder and its lattice parameter
а
= (1.1283±5·10
–4
) nm remained unchanged during mechanochemical alloying with titanium. The Ti
2
Ni (II) phase was formed in the process of mechanochemical alloying. The lattice parameter of Ti
2
Ni (II) decreased with an increase in the amount of titanium introduced into the Ti–Ni powder during alloying. It is shown that the Ti–Ni (85 wt.%)–Ti (15 wt.%) powder mixture has the maximum content of the Ti
2
Ni phase. It was found that the hydrogenation of a powder of the composition Ti–Ni (85 wt.%) – Ti (15 wt.%) for 90 min leads to a change in the lattice parameter of Ti
2
Ni (II), which corresponds to the parameter of the Ti
2
NiH
1.9
hydride, and at hydrogenation for 360 min, it corresponds to that of Ti
2
NiH
2.8
.