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In order to optimize hydrogen storage properties of bcc Ti–V–Cr alloys it was found that alloying with a few 4 at% of Zr 7Ni 10 results in acceleration the hydrogen sorption kinetics in the composite material. The novel intergranular phase plays a role of gate for hydrogen, leading parallel to its easy decrepitate, thus enhancing fast formation of Ti–V–Cr hydrides. Nevertheless, the question on how such a composite microstructure affects hydrogen mobility in the material is still open. Here we report on the results of the studies of hydrogen self-diffusion in hydrogenated (TiCr 1.8) 1-xV x based alloys (x = 0.2, 0.4, 0.6 and 0.8) carried out using proton nuclear magnetic resonance diffusiometry in a static field gradient . For all compounds the method has proved itself as a powerful tool to probe the microstructure of the multicomponent alloys with inhomogeneous element distribution in a few micrometer scale. It has been found that addition of Zr 7Ni 10 lowers the activation energy of hydrogen motion in (TiCr 1.8) 1-xV x alloys and leads appear two different diffusion areas. They can be associated with a redistribution of elements within the intra-granular phase due to opposite substitution of Ti and Ni atoms during synthesis and blurring the boundaries between the intra-granular and inter-granular phases.

Язык оригиналаанглийский
Страницы (с-по)7929-7937
Число страниц9
ЖурналInternational Journal of Hydrogen Energy
Том45
Номер выпуска14
Дата раннего онлайн-доступа13 июл 2019
DOI
СостояниеОпубликовано - 2020

    Предметные области Scopus

  • Физика конденсатов
  • Металлы и сплавы
  • Энергетическая технология
  • Технология топлива
  • Возобновляемые источники энергии и окружающая среда

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