Hydrogen uptake in titanium aluminides in high pressure hydrogen

Akito Takasaki, Yoshio Furuya, Youji Taneda

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The weight gains of Ti-25Al, Ti-45Al and Ti-53Al alloys, with typical single-phase Ti3Al, two-phase Ti3Al/TiAl (fully lamellar) and single-phase TiAl microstractures, respectively, were measured at temperatures up to 923 K in high pressure hydrogen, up to 10 MPa. The total hydrogen uptakes during heating to 923 K at constant hydrogen pressures and during increasing the hydrogen pressure to 10 MPa at constant temperatures increased with increasing amounts of the Ti3Al in the alloys. The Ti-25Al alloy cracked and then spontaneously disintegrated at high-hydrogen pressures. A ternary (Ti-Al-H) hydride then formed, whose crystal structure is the same as that of the y hydride (f.c.c.), known in the titanium-hydrogen binary system. No hydride could be detected in the Ti-45Al and Ti-53Al alloys. Most of the hydrogen taken up in the Ti-45Al and Ti-53Al alloys during heating and during pressure increase was released during cooling to room temperature or during pressure decrease to 0 MPa.

Original languageEnglish
Pages (from-to)265-270
Number of pages6
JournalMaterials Science and Engineering A
Volume239-240
Issue number1-2
Publication statusPublished - 1997 Dec

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Keywords

  • High pressure
  • High temperature
  • Hydride
  • Hydrogen
  • Hydrogen uptake
  • Thermogravimetry
  • TiAl
  • TiAl
  • Titanium aluminides

ASJC Scopus subject areas

  • Materials Science(all)

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