Hydrogenation of Ti-Ni powders subjected to mechanochemical alloying with titanium | Izvestiya vuzov. Fizika. 2022. № 7. DOI: 10.17223/00213411/65/7/28

Hydrogenation of Ti-Ni powders subjected to mechanochemical alloying with titanium

The paper studies the structure and phase composition of Ti-Ni alloy of near-equiatomic composition after its mechanochemical alloying with titanium in a planetary ball mill and subsequent heat treatment and hydrogen sorption during hydrogenation. The content of titanium in powder mixtures varied from 7 to 25 wt.%. It is shown that the phase composition of the Ti-Ni powder before mechanochemical alloying consisted of TiNi ( B 2, B 19'), Ti₂Ni and Ni₃Ti phases. The (Ti-Ni) - Ti powders consisted of TiNi ( B 2, B 19') and Ti₂Ni phases after mechanochemical alloying and subsequent heat treatment. It was revealed that the Ti₂Ni phase had a different genesis. The Ti₂Ni (I) phase existed in the Ti-Ni powder before mechanochemical alloying, the lattice parameter the Ti₂Ni (I) did not change and was equal to 1.1283± 5∙10^-4 nm. Phase Ti₂Ni (II) is formed in the process of mechanochemical alloying and subsequent heat treatment, the lattice parameter of Ti₂Ni (II) decreased with increasing titanium content added into the Ti-Ni powder during alloying. It was revealed that the composition Ti-Ni (85 wt.%) - Ti (15 wt.%) has the maximum content of the Ti₂Ni phase. It is shown that the average particle size increased with an increasing of titanium content added into the Ti-Ni powder during alloying and subsequent heat treatment due to the process of particle consolidation. Hydrogenation of a Ti-Ni (85 wt.%) - Ti (15wt.%) powder during 90 min leads to a change in the Ti₂Ni (II) lattice parameter, which corresponds to the Ti₂NiH_1.9 hydride parameter, and during 360 min, to Ti₂NiH_2.8.

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Keywords

Ti-Ni system, mechanochemical alloying, titanium, heat treatment, lattice parameter, phase composition

Authors

Name	Organization	E-mail
Abdulmenova E.V.	Institute of Strength Physics and Materials Science of SB RAS	ekaterina.v.abdulmenova@yandex.ru
Buyakova S.P.	Institute of Strength Physics and Materials Science of SB RAS	sbuyakova@yandex.ru
Kulkov S.N.	Institute of Strength Physics and Materials Science of SB RAS

Всего: 3

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