Microstructure and hydrogen storage properties of as-cast and rapidly solidified Ti-rich Ti-V alloys

Suwarno Suwarno*, Jan Ketil Solberg, Jan Petter Maehlen, Bente Krogh, Borre Tore Borresen, Esther Ochoa-Fernandez, Erling Rytter, Mario Williams, Roman Denys, Volodymyr A. Yartys

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The goal of the present work was to optimize the phase-structural composition and microstructure of binary Ti0.8-0.9V0.2-0.1 alloys with respect to their hydrogen sorption properties. Application of these alloys is for hydrogen absorption from gaseous mixtures containing substantial amounts of carbon monoxide (CO) at high temperatures. Irrespective of alloy composition, both α(HCP) and β(BCC) phases in Ti 0.8-0.9V0.2-0.1 formed single phase FCC hydrides upon hydrogenation in pure H2. An in situ synchrotron X-ray diffraction study showed that only the β-phase transformed to the corresponding hydride when the alloy was hydrogenated in a mixture of H2+10%CO. Rapid solidification (RS) of the alloy resulted in refined grain sizes both in the Ti0.8V0.2 and Ti0.9V0.1 alloys. Furthermore, RS was found to increase the β-phase fraction in Ti 0.9V0.1, being twice larger than that of the as-cast alloy. Ti0.9V0.1 had a platelike microstructure as observed by scanning electron microscopy (SEM), the plates were about 300 nm thick. The microstructure refinement resulted in a faster kinetics of H desorption as observed by temperature desorption spectroscopy (TDS).

Original languageEnglish
Pages (from-to)1831-1838
Number of pages8
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume22
Issue number8
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Keywords

  • Carbon monoxide
  • Hydrogen storage
  • Rapid solidification
  • Synchrotron X-ray diffraction
  • Ti-V alloys

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