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1997 Fiscal Year Final Research Report Summary

Order-Disorder Transformation Processes with Composition Variations Studied by IKL-ALCHEMI-EDX Method

Research Project

Project/Area Number 08455293
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

OKI Kensuke  KYUSHU UNIVERSITY,Interdisciplinaary Graduate School of Engineering Sciences, Professor, 大学院・総合理工学研究科, 教授 (70037860)

Co-Investigator(Kenkyū-buntansha) HATA Satoshi  KYUSHU UNIVERSITY,Interdisciplinary Graduate School of Engineering Sciences, Res, 大学院・総合理工学研究科, 助手 (60264107)
ITAKURA Masaru  KYUSHU UNIVERSITY,Interdisciplinary Graduate School of Engineering Sciences, Res, 大学院・総合理工学研究科, 助手 (20203078)
KUWANO Noriyuki  KYUSHU UNIVERSITY,Interdisciplinary Graduate School of Engineering Sciences, Ass, 大学院・総合理工学研究科, 助教授 (50038022)
Project Period (FY) 1996 – 1997
KeywordsL1_0-type ordered state / Ti-Al-Mo ternary alloy / IKL-ALCHEMI-EDX method / site-preference of Mo / cluster variation method / Lennard-Jones potential / B2-type ordered state / dynamical diffraction effect
Research Abstract

The L1_0-type ordered state in Ti-Al-Mo alloys was investigated quantitatively by means of the IKL-ALCHEMI-EDX method (intersecting Kikuchi-line method ; IKL,atom location by channelling-enhanced microanalysis ; ALCHEMI,and energy dispersive X-ray spectroscopy ; EDX) using an analycal transmission electron microscope (TEM). The application of the IKL-ALCHEMI-EDX method to the B2-type ordered state was also examined. The main conclusions are drawn as follows.
1.The site-preference of Mo in an L1_0 ordered Ti-Al-Mo phase is fixed by concentration ratio of Ti : Al in the fcc matrix. Mo atoms tend to occupy Al sublattice sites for a Ti-enriched matrix, while the site-preference of Mo turns to Ti sublattice sites for an Al-enriched matrix. This indicates that Mo exhibits no significant ordering tendency with Ti or Al for the L1_0 ordered state.
2.The L1_0 ordered state in the Ti-Al-Mo system calculated by the cluster variation method (CVM) with the Lennard-Jones atomic potential [Abe et al. ( … More 1993)] indicates a preferential ordering tendency in Mo-Ti. The results of the CVM contradicts the present experimental results.It is considered that the atomic potential used in the CVM calculation should be estimated more strictly for analyzing the Ti-Al-Mo system.
3.The values of structure factors of L1_0 or B2 superlattice reflections in the Ti-Al-Mo system are so small that values of separation of Kikuchi-lines hardly change with degree of order. Some other methods using, for example, thickness fringes in dark field TEM images should be utilized with the IKL method to obtain more reliable values of degree of order.
4.The superlattice reflections for the B2-type ordered state in Ti-Al-Mo alloys are hardly observed for X-ray diffraction, but they often appear clearly for electron diffraction. Many-beam dynamical diffraction calculations rationalized that the appearance of B2 superlattice reflections in the electron diffraction patterns is due to strong dynamical diffraction effects of electrons. This suggests that the B2 ordered state in the Ti-Al-Mo system can be analyzed quantitatively by the IKL-ALCHEMI-EDX method. Less

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] N.Kuwano: "Quantitative Analysis of Ordered Structure in Multinary Alloys by the IKL-ALCHEMI Method and Its Application to Ordering Kinetics" Journal of Electron Microscopy. 45・1. 93-98 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 沖 憲典: "拡散型変態に関する測定技術(IKL-ALCHEMI法の応用)" 日本金属学会会報まてりあ. 35・6. 695-699 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Hata: "Semi-Quantitative High Resolution Electron Microscopy of Short-Range Ordered Ni_4Mo" Journal of Surface Analysis. 3・2. 401-404 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 沖 憲典: "Ni-Mo合金の規則-不規則変態における新しい構造解析の試み" 日本金属学会会報まてりあ. 35・9. 862-865 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Hata: "Monte Carlo Study of Ordering Processes in fcc-Based Ni-Mo Alloys" Materials Transactions,JIM. 39・1. 133-138 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Matsumura: "Time-Evolution of Long Range Ordering in CuAuPd Ternary Aaloys" Materials Transactions,JIM. 39・1. 159-168 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Hata: "Short Range Order and Its Transformation to Long Range Order in Ni_4Mo" Acta Materia1ia. 46・3. 881-892 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 板倉 賢: "ミクロの世界・物質編、目で見る物性論" (社)日本電子顕微鏡学会編・学際企画, 46-47 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Kuwano, S.Matsumura, T.Furuse and K.Oki: "Quantitative Analysis of Ordered Structure in Multinary Alloys by the IKL-ALCHEMI Method and Its Application to Ordering Kinetics" J.Electron Microsc.45-1. 93-98 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Oki, N.Kuwano and S.Matsumura: "Experimental Technique for Diffusional Transformation (Application of the IKL-ALCHEMI Method) (in Japanese)" Materia Japan. 35-6. 695-699 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Hata, S.Matsumura, N.Kuwano and K.Oki: "Semi-Quantitative High Resolution Electron Microscopy of Short-Range Ordered Ni_4Mo" J.Surface Analysis. 3-2. 401-404 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Oki, S.Hata and N.Kuwano: "Application of New Analytical Techniques to the Order-disorder Transformation in Ni-Mo Alloys (in Japanese)" Materia Japan. 36-9. 862-865 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Hata, H.Fujita, C.G.Schlesier, S.Matsumura, N.Kuwano and K.Oki: "Monte Carlo Study of Ordering Processes in fcc-Based Ni-Mo Alloys" Mater.Trans., JIM. 39-1. 133-138 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Matsumura, T.Furuse and K.Oki: "Time-Evolution of Long Range Ordering in CuAuPd Ternary Alloys" Mater.Trans., JIM. 39-1. 159-168 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Hata, S,Matsumura, N.Kuwano and K.Oki: "Short Range Order and Its Transformation to Long Range Order in Ni_4Mo" Acta Materialia. 46-3. 881-892 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Itakura: Micro-World (Materials), Visual Physical Property (in Japanese). Gakusaikikaku Co., Ltd. (ed.) The Japanese Society of Electron Microscopy, 46-47 (1997)

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

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Published: 1999-03-16  

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