Degradation of hydrogen absobing capacity in cyclically hydrogenated TiMn2

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Abstract

Degradation of the hydrogen absorbing capacity in cyclically hydrogenated TiMn2 (Ti-60 at.% Mn) with Laves structure was studied by measurement of pressure-composition-isotherm (PCT) curves, X-ray diffraction and microstructure observation. Characteristic changes with cyclic hydrogenation are observed as follows. The hydrogen absorbing capacity remarkably decreases, the lattice constant increases, the amount of hydrogen retained in TiMn2 increases and it approaches almost zero by dehydrogenation at 673 K in vacuum. Nano-sized regions with Moiré patterns are produced in TiMn2 with hydrogenation and Debye rings corresponding to titanium hydride 5-TiH appear in the diffraction pattern. Based on these observations it is concluded that the degradation of hydrogen absorbing capacity after cyclic hydrogenation is attributable to the introduction of retained hydrogen, heterogeneous strain and/or nano-sized regions.

Original languageEnglish
Pages (from-to)927-935
Number of pages9
JournalActa Materialia
Volume49
Issue number5
DOIs
Publication statusPublished - 2001 Mar 14

Keywords

  • Hydride
  • Micro structure
  • Titanium alloys
  • Transmission electron microscopy (TEM)
  • X-ray diffraction (XRD)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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