Gas-phase hydrogenation influence on defect behavior in titanium-based hydrogen-storage material

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11 Citations (Scopus)

Abstract

Titanium and its alloys are promising materials for hydrogen storage. However, hydrogen penetration accompanies the exploitation of hydrogen storage alloys. In particular, hydrogen penetration and accumulation in titanium alloys changes their mechanical properties. Therefore, the research works of such materials are mainly focused on improving the reversibility of hydrogen absorption-liberation processes, increasing the thermodynamic characteristics of the alloys, and augmenting their hydrogen storage capacity. In the process of hydrogenation-dehydrogenation, the formed defects both significantly reduce hydrogen storage capacity and can also be used to create effective traps for hydrogen. Therefore, the investigation of hydrogen interaction with structural defects in titanium and its alloys is very important. The present work, the hydrogen-induced formation of defects in the alloys of commercially pure titanium under temperature gas-phase hydrogenation (873 K) has studied by positron lifetime spectroscopy and Doppler broadening spectroscopy. Based on the evolution of positron annihilation parameters τf, τd, their corresponding intensities If, Id and relative changes of parameters S/S0 and W/W0, the peculiarities of hydrogen interaction with titanium lattice defects were investigated in a wide range of hydrogen concentrations from 0.8at% to 32.0at%.

Original languageEnglish
Pages (from-to)105-111
Number of pages7
JournalProgress in Natural Science: Materials International
Volume27
Issue number1
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • Doppler broadening
  • Hydrogen
  • Lattice defects
  • Positron annihilation
  • Positron lifetime
  • Titanium

ASJC Scopus subject areas

  • General

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