Impact of severe plastic deformation on microstructure and hydrogen storage of titanium-iron-manganese intermetallics

Kaveh Edalati, Motoaki Matsuo, Hoda Emami, Shota Itano, Ali Alhamidi, Aleksandar Staykov, David J. Smith, Shin ichi Orimo, Etsuo Akiba, Zenji Horita

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

TiFe1-xMnx intermetallics (x = 0, 0.15 and 0.3) were severely deformed by high-pressure torsion (HPT) to enhance their activation and air resistivity for hydrogenation. While the as-cast ingots hardly absorbed hydrogen (TiFe0.7Mn0.3 exhibited slow activation after an incubation period), the HPT-processed samples absorbed hydrogen quickly at room temperature even after air exposure. The improvement of hydrogen storage performance was due to the formation of lattice defects and amorphous regions, which act as channels for hydrogen diffusion. Rietveld analyses and first-principles calculations showed that Mn addition expands the lattice and reduces the hydride formation energy, and thus decreases the hydrogenation/activation pressure.

Original languageEnglish
Pages (from-to)108-111
Number of pages4
JournalScripta Materialia
Volume124
DOIs
Publication statusPublished - 2016 Nov 1

Keywords

  • Activation
  • Density functional theory (DFT)
  • High-pressure torsion (HPT)
  • Metal hydrides
  • Nanostructured intermetallics

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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  • Cite this

    Edalati, K., Matsuo, M., Emami, H., Itano, S., Alhamidi, A., Staykov, A., Smith, D. J., Orimo, S. I., Akiba, E., & Horita, Z. (2016). Impact of severe plastic deformation on microstructure and hydrogen storage of titanium-iron-manganese intermetallics. Scripta Materialia, 124, 108-111. https://doi.org/10.1016/j.scriptamat.2016.07.007