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2005 Fiscal Year Final Research Report Summary

IMPROVEMENT OF HYDROGENATION PROPERTIES FOR TI-BASED QUASICRUSTAL POWDERS PRODUCED BY MECHANICAL ALLOYING

Research Project

Project/Area Number 15560577
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionSHIBAURA INSTITUTE OF TECHNOLOGY

Principal Investigator

TAKASAKI Akito  SHIBAURA INST.OF TECH., DEPT.OF MECHANICAL ENG.II, PROFESSOR, 工学部, 教授 (70286699)

Project Period (FY) 2003 – 2005
Keywordsquasicrystal / hydrogenation / hydrogen desorption / mechanical alloying / Ti-Zr / Hf-Ni / hydrogen cycling / amorphous
Research Abstract

Besides the conventional solidification processes like rapid quenching, a combination of mechanical alloying (MA) and subsequent annealing in vacuum was shown to also produce the Ti-Zr-Ni icosahedral phase (i-phase) for a range of chemical composition. Depending upon the chemical compositions, minor phases such as the solid solution phase (α-Ti/Zr) and the Ti_2Ni-type phase (fcc structure) also formed after subsequent annealing The Ti-Zr-Ni i-phase powders could load hydrogen to a concentration greater than 60 at.%. The maximum concentration reached was 67 at% (H/M 【approximately equal】 2.02) which was obtained for the Ti_<45>Zr_<38>Ni_<17> i-phase powder during a high-pressure isotherm measurement. The substitution of Zr atoms for Ti ones in the Ti-Zr-Ni i-phase powders decreased the activation energy for hydrogen desorption and the hydrogen desorption temperatures. Besides the plateau-like pressure observed during the low-pressure isotherm measurement for the i-phase powder an additi … More onal plateau was also observed at about 0.5 MPa (desorption process) during a high-pressure isotherm measurement. The i-phase in the Ti-Zr-Ni powder remained stable even after hydrogenation, but the amorphous powders transformed into a fcc (Ti, Zr)H_2 hydride phase, whose activation energy for hydrogen desorption was generally higher than that measured for the i-phase.
The i-phase could also be produced from Ti_<40>Hf_<40>Ni_<20> elemental powders by MA and subsequent annealing, coexisting with a Ti_2Ni-type crystal phase. The amount of the Ti_2Ni-type phase was much larger than obtained in the Ti-Zr-Ni powders. The hydrogen concentration in the Ti_<40>Hf_<40>Ni_<20> i-phase powder was about 55 at.% after loading from the gas phase at 573 K and an initial hydrogen pressure of 3.8 MPa. This was slightly lower than observed for the Ti-Zr-Ni i-phase powders. The activation energy for hydrogen desorption was also lower than for the Ti-Zr-Ni i-phases, suggesting that the substitution of Hf for Zr decreased the chemical interaction between hydrogen in the tetrahedral sites and the surrounding metal atoms. Less

  • Research Products

    (11 results)

All 2006 2004 2003 Other

All Journal Article (10 results) Book (1 results)

  • [Journal Article] Hydrogen Storage in Ti-based Quasicrystals Produced by Mechanical Alloying2006

    • Author(s)
      A.Takasaki, K.F.Kelton
    • Journal Title

      International Journal of Hydrogen Energy 32(2)

      Pages: 183-190

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogen Storage of Ti-Zr and Ti-Hf-Based Quasicrystals2006

    • Author(s)
      K.F.Kelton, J.J.Hartzell, R.G.Hennig, V.T.Huett, A.Takasaki
    • Journal Title

      Philosophical Magazine 86(4-6)

      Pages: 957-964

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogen Storage of Ti-Zr and Ti-Hf-Based Quasicrystals2006

    • Author(s)
      K.F Kelton, J.J.Hartzell, R.G.Hennig, V.T.Huett, A.Takasaki
    • Journal Title

      Philosophical Magazine 86(6-8)

      Pages: 957-964

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrogenation of Ti-Zr-Ni Quasicrystals Synthesized by Mechanical Alloying2004

    • Author(s)
      A.Takasaki, V.T.Huett, K.F.Kelton
    • Journal Title

      Journal of Non-crystalline Solids 334-335

      Pages: 457-460

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Synthesis of Quasicrystal Phases by Mechanical Alloying of Ti_<45+x>Zr_<38-x>Ni_<17> (0 【less than or equal】 x 【less than or equal】 16) Powder Mixtures, and Their Hydrogen Storage Properties2004

    • Author(s)
      A.Takasaki, N.Imai, K.F.Kelton
    • Journal Title

      Quasicrystals 2003 - Preparation, Properties and Applications, Materials Research Society Symposium Proceedings 805

      Pages: 351-356

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogenation of Ti-Zr-Ni Quasicrystals Synthesized by Mechanical Alloying2004

    • Author(s)
      A.Takasaki, V.T.Huett, K.F Kelton
    • Journal Title

      Journal of Non-crystalline Solids, 334-335 (2004) 457-46 334-335

      Pages: 457-46

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Synthesis of Quasicrystal Phases by Mechanical Alloying of Ti_<45+x>Zr_<38-x>Ni_<17>(0【less than or equal】x【less than or equal】16) Powder Mixtures, and Their Hydrogen Storage Properties2004

    • Author(s)
      A.Takasaki, N.Imai, K.F.Kelton
    • Journal Title

      Quasicrystals 2003-Preparation, Properties and Applications, Materials Research Society Symposium Proceedings (E.Belin-Ferre, M.Feuerbacher, Y.Ishii, D.J.Sordelet eds.)(MRS) Vol.805

      Pages: 351-356

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] チタン基準結晶合金の水素吸蔵2003

    • Author(s)
      高崎 明人
    • Journal Title

      軽金属 53(6)

      Pages: 265-271

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Hydrogen Storage in Ti-based Quasicrystals (in Japanese)2003

    • Author(s)
      A.Takasaki
    • Journal Title

      Journal of Japan Institute of Light Metals 53(6)

      Pages: 265-271

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Hydrogen Storage in Ti-Zr/Hf-Ni Quasicrysral and Related Crystal Powders Synthesized by Mechanical Alloying

    • Author(s)
      A.Takasaki, K.F Kelton
    • Journal Title

      Hydrogen Treatment of Materials (HTM) - Book (Donetsk State Technical University) (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] One chapter in "Hydrogen Treatment of Materials (HTM) Book"2006

    • Author(s)
      A.Takasaki, K.F.Kelton
    • Publisher
      Donetsk State Technical University(to be published)
    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2007-12-13  

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