Effect of structural changes on degradation of hydrogen absorbing capacity in cyclically hydrogenated TiMn2 based alloys

Satoshi Semboshi, Masaki Sakurai, Naoya Masahashi, Toyohiko J. Konno, Shuji Hanada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Structural changes of cyclically hydrogenated TiMn2 based alloys, in which the compositions of the TiMn2 Laves phase are about 60 and 61at.% Mn, have been investigated to understand the mechanism of the degradation of their hydrogen absorbing capacity. There are no apparent changes in micro- and nano-scale metallurgical features in the Ti-60at.% Mn alloy, which exhibited superior endurance cyclic property. On the contrary, hydride formation, decrease in crystalline size and/or introduction of heterogeneous strain, and the deviation of Mn atom position have been observed in Ti-61at.% Mn alloy, which exhibited poor cycle property, arising from retained hydrogen in the TiMn2 Laves phase. Therefore, it is considered that structural changes with cyclic hydrogenation sensitively depend on the composition of TiMn2 Laves phase, governing the degradation behavior. The mechanism of the degradation of cyclic property is discussed in view of the substitution behavior in the hexagonal TiMn2 Laves phase.

Original languageEnglish
Pages (from-to)232-240
Number of pages9
JournalJournal of Alloys and Compounds
Volume376
Issue number1-2
DOIs
Publication statusPublished - 2004 Aug 11

Keywords

  • Hydride
  • Microstructure
  • TiMn alloys
  • X-ray absorption fine-structure (XAFS)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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