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High Resolution Electron Microscope Study on Formation and Growth Processes of Atomic Medium Range Order in Amorphous Alloys

Research Project

Project/Area Number 02452232
Research Category

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

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

Principal Investigator

HIROTSU Yoshihiko  Nagaoka University of Technology, Professor, 工学部, 教授 (70016525)

Co-Investigator(Kenkyū-buntansha) ISHIGURO Takashi  Nagaoka University of Technology, Assistant Professor, 工学部, 助教授 (10183162)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1991: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1990: ¥6,400,000 (Direct Cost: ¥6,400,000)
KeywordsAmorphous Alloys / Rapid Quenching / Medium Range Order / Structure Relaxation / High Resolution TEM / Nano-beam Local Analysis / ナノビ-ムアナリシス
Research Abstract

This study has been made as a two years project study from 1990 to 1991 in order to investigate structure and morphologies of atomic medium range order (MRO) in amorphous alloys, especially to investigate its formation and growth processes. As an amorphous alloy system we chose Pd-Si system. since the system has been well known as having a lot of X-ray and neutron diffraction data. In this study, eutectic Pd_<82>Si_<18> alloy ribbons made by rapid-quenching and Pd_<82>Si_<18> thin films prepared by Ar-beam sputtering were used as specimens. Structure observations of as-formed and annealed specimens were made by high resolution electron microscopy (HREM) and analytical electron microscopy. For thinning ribbon specimens, an ion-milling equipment was used which was funded by this research project. Obtained results are as follows:
(1)MRO structures were observed in both of the ribbon and sputtered specimens. Calculated HREM images based on a fcc-MRO structure model were consistent with thos … More e observed.
(2)Size and distribution of MRO domains were dependent of the cooling rate in rapid-quenching or in the vapor deposition.
(3)On Annealing up to 573K, a MRO domain growth was observed. At 573K the MRO domain grows to a size of about 5nm, giving a splitting of the second halo diffraction ring into two diffuse rings in the selected area diffraction. Clear fcc diffraction patterns are obtained from the domains by the nano-beam diffraction. Si atoms in the MRO domains diffuse out to the matrix region on annealing at 573K.
(4)On annealing at 623K clear fcc diffraction patterns start to appear in the selected area diffraction. The precipitation of alpha-Pd with a size of about 8nm starts at this temperature.
The MRO structure and its growth on annealing are observed in both ribbon and thin film specimens in the same morphology in the same temperature ranges. The "structural relaxation" in an amorphous alloy on annealing can be understood as a phenomenon in which a free-volume reduction occurs mainly by the growth of MRO and a chemical ordering of atoms in the matrix proceeds by the local compositional variation on annealing. Less

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Y.Hirotsu,K.Anazawa and T.Okubo: "High Resolution Electron Microscope Observation of Medium Range Atomic Ordering in an Amorphous Pd-Si Alloy" Materials Trans.,JIM. 31. 573-581 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 弘津 禎彦,穴澤 一則: "アモルファス合金構造の高分解能電子顕微鏡観察" 日本電子顕微鏡学会報. 25. 138-144 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Hirotsu,K.Anazawa and S.Nagakura: "Structure of Sputter-Deposited Amorphous Pd-Si Alloy Studied by High Resolution Electron Microscopy" Proceedings of X II th Inter.Congress for Electron Microscopy,Seattle,1990,Aug.,p126-127.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Anazawa,Y.Hirotsu and Y.Ichinose: "High Resolution Electron Microscope Observation of Medium-Range Atomic Ordering in Amorphous Alloy" J.Non-Cryst.Solids,(1993)in press Proceedings of 8-th Inter.Conf.on Liquid and Amorphous Metals,Wien,1992.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Hirotsu and K.Anazawa: "Medium Range Atomic Ordering in Amorphous Alloys Studied by High Resolution Electron Microscpy" to be appeared in “Progress in Amorphous Materials-Science and Technology-",Edited by Y.Sakurai,Elsevier Science Publishers B.V.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Anazawa,Y.Hirotsu and Y.Inoue: "Microstructural Change in the Course of Decomposition of an Amorphous Pd_<82>Si_<18> Alloy" to be submitted in Materials Trans.JIM.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Hirotsu, K.Anazawa and T.Okubo: "High Resolution Electron Microscope Observation of Medium Range Atomic Ordering in an Amorphous Pd-Si Alloy" Materials Trans., JIM. 31. 573-581 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Hirotsu and K.Anazawa: "High Resolution Electron Microscopic Observation of Amorphous Alloy Structures" Electron Microscopy. 25. 138-144 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Hirotsu, K/Anazawa and S.Nagakura: "Structure of Sputter-Deposited Amorphous Pd-Si Alloy Studied by High Resolution Electron Microscopy" Proceedings of XIIth inter. Congress for Electron Microscopy,Seattle. 126-127 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Anazawa, Y.Hirotsu and Y.Ichinose: "Electron Microscope Observation of Medium-Range Atomic Ordering in Amorphous Alloy" J.Non-Cryst. Solids, (1993) (Proceedings of 8-th Inter. Conf. on Liquid and Amorphous Metals, Wien, 1992).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Y.Hirotsu and K.Anazawa: "Medium Range Atomic Ordering in Amorphous Alloys Studied by High Resolution Electron Microscopy to be appeared in "Progress in Amorphous Materials" - Science and Technology-", Edited by Y.Sakurai, Elsevier Science Publishers B.V.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.Anazawa, Y.Hirotsu and Y.Inoue: "Microstructural Change in the Course of Decomposition of an Amorphous Pd_<82>Si_<18> Alloy" to be submitted in Materials Trans. JIM.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 弘津 禎彦,穴澤 一則: "アモルファス合金構造の高分解能電子顕微鏡観察" 電子顕微鏡. 25巻. 138-144 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Yoshihiko Hirotsu.,Kazunori Anazawa: "Medium Range Atomic Ordering in Amorphous Alloys Studied by High Resolution Electron Microscopy" Progress in Amorphous Materials (Elsevier Science Publushers).

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Hirotsu,K.Anazawa,T.Ohkubo: "High Resolution Electron Microscope Observation of Medium Range Atomic Ordering in an Amorphous PdーSi Alloy" Materials Transactions,JIM. 31. 573-581 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.Hirotsu,K.Anazawa,S.Nagakura: "Structure of SputterーDeposited Amorphous PdーSi Alloy Studied by High Resolution Electron Microscopy" Proceedings of the X II th International Congress for Electron Microscopy(Seattle). 126-12 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 弘津 禎彦、穴澤 一則: "アモルファス合金構造の高分解能電子顕微鏡観察" 電子顕微鏡. 26. 138-144 (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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