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1991 Fiscal Year Final Research Report Summary

Positron lifetime study of dislocations in metals

Research Project

Project/Area Number 02805079
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionKyoto University

Principal Investigator

SHIRAI Y.  Kyoto University, Department of Metal Science and Technology, Associate Professor, 工学部, 助教授 (20154354)

Project Period (FY) 1990 – 1991
KeywordsPositron Annihilation / Dislocations / Burgers Vector / 積層欠陥エネルギ- / 金属間化合物
Research Abstract

Positron lifetime measurements have been performed on some fcc metals and alloys, which were treated to be in such specific conditions that only a given type of dislocations are predominantly contained. The results show that the positron lifetime increases monotonously with the magnitude of Burgers vectors of dislocations. When dislocations are actually extended, the observed positron lifetime comes from partial dislocations and is remarkably shorter than that at undissociated dislocations. Present results not only demonstrate that positron annihilation parameters observed predominantly come from dislocation lines themselves but also show that positron lifetime spectroscopy can be used to differentiate between different types of dislocations.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Y.Shirai: "Systematic change in positron lifetime with the magunitude of Burgers vectors of dislocations in metals" J.Materials Science Form. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Shirai: "Lattice defects in intermetallic compound TiAl studied by positron lifetime spectroscopy" J.Materials Science Form. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Shirai: "Studyies of vacancies and dislocations in TiAl by positron annihilation" J.Materials Science and Engineering A. (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Shirai: "Intermetallic Compounds(edited by O.Izumi)" The Japan Institute of metals(Sendai), 63-67 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Shirai, K. Matsumoto and M. Yamaguchi: "Recovery of electron- and proton-irradiated TiAl studied by positron lifetime spectroscopy" "Intermetallic Compounds". Japan Inst. Metals, Sendai. 63-67 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shirai, K. Matsumoto, G. Kawaguchi and M. Yamaguchi: "Systematic change in positron lifetime with the magnitude of Burgers vectors of dislocations in metals" J. Materials Science Forum. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shirai, K. Matsumoto, M. Yamaguchi, K. Fukuda, R. Taniguchi and S. Tsukui: "Lattice defects in intermetallic compound TiAl studied by positron lifetime spectroscopy" J. Materials Science Forum. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shirai, K. Matsumoto, M. Yamaguchi, K. Fukuda, R. Taniguchi and S. Tsukui: "Lattice defects in intermetallic compound TiAl studied by positron lifetime spectroscopy" J. Materials Science Forum. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Shirai and M. Yamaguchi: "Studies of vacancies and dislocations in TiAl by positron annihilation" J. Mater. Sci. Engineering A. (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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