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Phase Equilibrium and Phase Separation in quaternary Fe-Al-Co-Ti B2 ordered compound

Research Project

Project/Area Number 11650678
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionNagoya Institute of Technology

Principal Investigator

KOZAKAI Takao  Nagoya Institute of Technology・Department of Materials Science and Engineering, Associate Professor, 工学部・材料工学科, 助教授 (80110253)

Co-Investigator(Kenkyū-buntansha) KOYAMA Toshiyuki  Nagoya Institute of Technology・Department of Materials Science and Engineering, Research Fellow, 工学部・材料工学科, 助手 (80225599)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsDO_3 ordered phase / B2 ordered phase / transmission electron microscopy / A2+B2+DO_3 three-phase field / microstructure / spinodal decomposition / precipitation on interface / Heusler phase / D0_3規則相 / A2+B2+D0_3 3相分離 / 二相分離 / 三相分離 / 三相スピノーダル分解 / B2金属間化合物 / ホイスラー / 2相分離 / 3相分離 / 金属間化合物 / 透過電子顕微鏡観察
Research Abstract

Phase equilibrium and phase separation process in Fe-Al-Co-Ti quaternary alloy system had been investigated by means of transmission electron microscopy.
When more than 2at%Ti was added into Fe-20at%Al-20at%Co alloy, DO_3(L2_1) ordered phase was stabilized at the temperature over 973K and thereby two kinds of two-phase coexistence fields, (A2+DO_3) and (B2+DO_3) appeared. In particular in the Fe-Al-Co-2at%Ti and the Fe-Al-Co-3at%Ti alloys three-phase coexistence field was newly found. It was found from the chemical analysis by energy dispersion X-ray spectroscopy (EDS) of the constitutive phases in the phase-separated microstructures that the three-phase field was at the temperature range from 1030K to 1075K and most of Ti element was distributed into DO_3 phase and A2 phase does not contained Ti.
When the alloy being within the three-phase field was decomposed from B2 single phase, the phase decomposition occurred at the following three steps: First, the B2 alloy decomposed into A2 and B2 phases and so-called mottled structure was formed. Second, DO_3 ordered particles precipitated within the B2 ordered domains and thereby the morphology of microstructure changed to the anisotropic periodic structure. At the final stage, cubic particles of the B2 and DO_3 phases aligned along <100> direction in the A2 matrix. These phase separation processes are able to be qualitatively explained by the 2-dimensional computer-simulation.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Takao Kozakai: "Effect of Ti Addition on the Phase Equilibria in Fe-AI-Co Ordering System and A2+B2+D0_3 Three-Phase Field"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRJCM4). 2. 2449-2502 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Takao Kozakai: "Spinodal Decomposition in Fe-rich Fe-Co-Al Ordered Alloy"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRJCM4). 2. 2503-2506 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Thkao Kozakai: "Phase Diagram of the Fe-Co-Ti system at 1073K"Z. Metallkd.. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Takao Kozakai: "Spinodal Decomposition in Fe-rich Fe-Co-Al Ordered Alloy"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4). vol.2. 2503-2506 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Takao Kozakai: "Effect of Ti Addition on the Phase Equilibria in Fe-Al-Co Ordering System and A2+B2+DO_3 Three-Phase Field"The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4). vol.2. 2449-2502 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Takao Kozakai: "Phase Diagram of the Fe-Co-Ti system at 1073K"Z. Metallkd.. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Takao Kozakai: "Effect of Ti Addition on the Phase Equilibria in Fe-Al-Co Ordering System and A2+B2+D0_3 Three-Phase Field"The Fourth Pacific Rim International Conference on Advanced Materials and Processing(PRICM4). 2. 2449-2502 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Takao Kozakai: "Spinodal Decomposition in Fe-rich Fe-Co-Al Ordered Alloy"The Fourth Pacific Rim International Conference on Advanced Materials and Processing(PRICM4). 2. 2503-2506 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Kozakai: "Phase Separation and Phase Diagram in the Fe-Ge-V Ordered Alloys"Z.Metallkd.. 90. 44-49 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Kozakai: "Phase Equilibria in the Fe-Al-Co Ternary System at 923K"Z.Metallkd.. 90. 261-266 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Kozakai: "Phase Equilibrium in the Fe-Co side of Fe-Ge-Co Ternary Ordering System"Proc.of the International Conference on Solid-Solid Phase Transformation '99 (JIMIS-3). 705-708 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 小山敏幸: "Phase-field法による相分解組織形成の計算シュミレーション"日本金属学会会報「まてりあ」. 38. 624-628 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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