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2001 Fiscal Year Final Research Report Summary

Structural study on quasicrystals and their approximants in the Al-Ni-Co alloy system, by means of anomalous X-ray scattering

Research Project

Project/Area Number 12450257
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionThe University of Tokyo

Principal Investigator

SUGIYAMA Kazumasa  Graduate School of Science, The University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (40196762)

Co-Investigator(Kenkyū-buntansha) HIRAGA Kenji  Tohoku University, Institute of Materials Research, Professor, 金属材料研究所, 教授 (30005912)
Project Period (FY) 2000 – 2001
Keywordsquasicrystal / X-ray diffraction / decagonal phase / approximant / anomalous Scattering / Al-Ni-Co alloy
Research Abstract

The Al-Ni-Co decagonal phase has received much attention, because, of several modulations of decagonal quasicrystals, showing highly-ordered diffraction patterns or several different type of diffraction patterns with super-lattice reflections, and some crystalline approximants. In order to reveal the structures of these decagonal quasicrystals, many studies have been made by electron diffraction analysis, high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAERDF-STEM). However, previous studies have been made on individual decagonal quasicrystals, and no systematic interpretation on the structures of all the Al-Ni-Co decagonal quasicrystals has been performed. This research project has performed precise structural analysis of a crystalline approximant, which is found in alloy around Al_<72.5>Ni_<17>Co_<20.5>, annealed at 950℃. The structure of this W-(AlCoNi) phase, enables us to discuss the str … More uctures of the Al-Ni-Co decagonal quasicrystals in detail. These research results can be referred as one of the most important structural information considering the quasicrystals and related approximant crystals and the head investigator was invited to International Conference of Quasicrystals 2001.
The present research project developed the relatively new technique of single crystal anomalous X-ray scattering technique, which prompts us to know fine structure around a specific element in an alloy sample. This, new analytical tool succeeded to characterize the distribution of Cu in the Al-Cu-Fe approximant phase and allowed us to understand the structural role for Cu for the formation of approximant phase related to quasicrystals.
The present research group has also performed the systematic research with respect to structures of cubic approximant phase with large icosahedarl atom clusters. The obtained results were demonstrated in the International Workshop for Quasicrystals as a key lecture. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] K.Hiraga, T.Ohsuna, W.Sun, K.Sugiyama: "Structural Characterization of Al-Co-Ni decagonal Quasicrystals and Crystalline Approximants"Mater. Trans. JIM. 42・11. 2354-2367 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Sugiyama, W.Sun, K.Hiraga: "Crystal Structure of a Cubic Al_<17>Zn_<37>Mg_<46>; a 2/1 Rational Approximant structure for the Al-Zn-Mg Icosahedral Phase"J. Alloy. Comp. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Genba, K.Sugiyama, K.Hiraga, Y.Yokoyana: "Crystalline Structure of a Cu-substituted -A_<13>Fe_4 Phase by means of the Anomalous X-ray Scattering"J. Alloy. Comp. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Sugiyama, S.Nishimura, K.Hiraga: "The Structure of a W-(AlCoNi) Crystalline Phase related to AlCoNi Decagonal Quasicrystals"J. Alloy. Comp. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Sugiyama, H.Saito, K.Hiraga: "On the Crystal Structure of the Al-Cr-Cu Alloy System"J. Alloy. Comp. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hiraga, J.Ohswa, W.Sun, K.Sugiyama: "The Structural of Characteristics of Al-Co-Ni Decagonal Quasicrystals and Crystalline Approximants"J. Alloy. Comp. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. Hiraga, T. Ohsuna, W. Sun and K. Sugiyama: "Structural Characterization of Al-Co-Ni Decagonal Quasicrystals and Crystalline Approximants"Mater. Trans.. 42(11). 2354-2367 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Sugiyama, W. Sun and K. Hiraga: "Crystal Structure of aCubic Al_<17>Zn_<87>Mg_<46>, a 2/1 Rational Approximant Structure for the Al-Zn-Mg Icosahedral Phase"J. Alloy. Comp.. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Genba, K. Sugiyama, K. Hiraga and Y. Yokoyama: "Crystalline Structure of a Cu-substituted λAl_<18>Ke_4 Phase by means of the Anomalous X-ray Scattering"J. Alloy. Comp.. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Sugiyama, S. Nishimura and K. Hiraga: "Structure of a W-(AlCoNi) Crystalline Phase related to Al-Co-Ni Decagonal Quasicrystals, studied by Single Crystal X-ray diffraction"J. Alloy. Comp. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Sugiyama, H. Saito and K. Hiraga: "On the Crystal Structure of the Al-Cu-Cr Alloy System"J. Alloy. Comp.. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Hiraga, T. Ohsuna, W. Sun and K. Sugiyama: "The Structural Characteristics of Al-Co-Ni Decagonal Quasicrystal and Crystalline Approximants"J. Alloy. Comp.. (in press).

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

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Published: 2003-09-17  

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