Hydrogenation of TiNi shape memory alloy produced by mechanical alloying

Takeshi Saito, Tomonori Yokoyama, Akito Takasaki

研究成果: Article査読

13 被引用数 (Scopus)

抄録

TiNi intermetallic compounds, produced by a combination of mechanical alloying and direct current sintering, were hydrogenated at several hydrogen pressures at 473 K for 4 h to investigate their hydrogen desorption and martensitic transformation behaviors. The microstructures and the hydrogen desorption properties were dependent on levels of hydrogen concentrations. The crystal lattice of TiNi (B2) phase expanded and TiNi hydride formed with an increase in hydrogen pressure. Two stage martensitic and reverse transformations were observed at low hydrogen concentration. An enthalpy of martensitic transformation was lower than that of reverse transformation. TiNi (martensite) phase was confirmed at intermediate hydrogen concentration, suggesting that hydrogen-induced martensitic transformation occurred during hydrogenation. No martensitic and reverse transformations occurred at high hydrogen concentration because of the hydride formation.

本文言語English
ページ(範囲)S779-S781
ジャーナルJournal of Alloys and Compounds
509
SUPPL. 2
DOI
出版ステータスPublished - 2011 9 1

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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