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Strengthening mechanism of reaction layer at Fe/Al interface to design and control the Al/Fe weld without property deterioration

Research Project

Project/Area Number 21H01662
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 26050:Material processing and microstructure control-related
Research InstitutionTohoku University

Principal Investigator

Sato Yutaka  東北大学, 工学研究科, 教授 (00292243)

Co-Investigator(Kenkyū-buntansha) 鴇田 駿  東北大学, 工学研究科, 助教 (60807668)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2022: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2021: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Keywords異材接合 / Al/Fe接合 / 反応層 / 元素添加 / 機械的性質 / ミクロ組織 / 溶接・接合
Outline of Research at the Start

異材接合は豊かな社会構築に不可欠な技術であるが、接合時に脆弱な界面層が形成されるため、求められる接合強度を達成することは難しく、汎用化に至っていない。研究代表者らは、種々の異材接合において、界面への元素添加により接合強度を大幅に向上させることに成功した。しかし、既存の材料強度学に基づいて界面層の強度発現機構を定量的に説明するに至っておらず、強度発現因子の形成機構に及ぼす合金元素の影響も解明されていない。本研究では、Al合金と鋼の異材接合を対象とし、“界面層の強度発現機構”と“界面層の材料組織学的な強度発現因子の形成機構と合金元素の影響”を明らかにすることを目的とする。

Outline of Final Research Achievements

This study aimed to elucidate the strengthening mechanism of dissimilar weld interface of Al to Fe by additions of alloying elements, such as Zn, Ni and Zn+Ni. Microstructure observations and nanoindentation tests of the layer revealed that the addition of Zn and Zn+Ni reduced the hardness of the interfacial layer through formation of Fe-Zn compounds. Single addition of Ni resulted in formation of dense interfacial layer consisting of fine Fe2Al5 grains with low fraction of Fe islands. These microstructural changes achieved by the additional elements might contribute to the strength improvement in the Al/Fe dissimilar weld.

Academic Significance and Societal Importance of the Research Achievements

本研究の過程で、Al/Fe異種金属接合体の破壊は界面層におけるき裂の発生によって支配され、その接合強度は界面層におけるき裂発生応力と相関があることが示唆された。したがって、き裂の発生起点を抑制した界面層の設計を達成することができれば、Al/Fe接合に限らず、界面層を介して接合が達成されるAl/Cu、Al/Mg、Fe/Tiなどの異材接合についてもさらなる界面強度向上が期待される。そのため、異材接合の高強度化のための指針を提示した本研究は、学術的および社会的にも有用といえる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (12 results)

All 2023 2022 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (10 results) (of which Int'l Joint Research: 4 results)

  • [Int'l Joint Research] University of Lyon(フランス)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Drastic improvement in dissimilar aluminum-to-steel joint strength by combining positive roles of silicon and nickel additions2023

    • Author(s)
      K.T. Suzuki, S. Omura, S. Tokita, Y.S. Sato, Y. Tatsumi
    • Journal Title

      Materials & Design

      Volume: 225 Pages: 111444-111444

    • DOI

      10.1016/j.matdes.2022.111444

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Al/Fe異種金属接合界面における金属間化合物層の成長に及ぼすNiの影響2023

    • Author(s)
      鈴木聖顕,鴇田駿,佐藤裕,巽雄二郎
    • Organizer
      溶接学会春季全国大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Interfacial microstructure of dissimilar weld of steel to aluminum containing intermediate metals and its effect on mechanical properties2023

    • Author(s)
      Kiyoaki T. Suzuki, Shun Omura, Shun Tokita, Yutaka S. Sato, Sylvain Dancette
    • Organizer
      76th International Insitute of Welding Annual Assembly and International Conference of Welding and Joining
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Al/Fe異種金属接合界面における金属間化合物の組織形成に及ぼすNiおよびZn複合添加の影響2023

    • Author(s)
      鈴木聖顕,大村隼,鴇田駿,佐藤裕
    • Organizer
      溶接学会秋季全国大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] X線CTを用いたAl/Fe異種接合継手の破壊挙動のその場観察2023

    • Author(s)
      鈴木聖顕,Sylvain Dancette,Jerome Adrien,鴇田駿,佐藤裕
    • Organizer
      溶接学会秋季全国大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] FEM estimation of interfacial strength of dissimilar Al/Fe arc weld through fracture analysis by X-ray2023

    • Author(s)
      Kiyoaki T. Suzuki, Yutaka S. Sato, Shun Tokita, Jerome Adrien, Sylvain Dancette
    • Organizer
      The 11th Pacific Rim International Conference on Advanced Materials and Processing (PRICM11)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Coupled numerical-experimental approach to access interfacial temperature during aluminum-steel dissimilar arc welding2023

    • Author(s)
      Benjamin Leflon, Sylvain Dancette, Thibaut Chaise, Christophe Le Bourlot, Nicolas Mary, Kiyoaki T. Suzuki, Yutaka S. Sato
    • Organizer
      The 11th Pacific Rim International Conference on Advanced Materials and Processing (PRICM11)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Al/Fe異種金属接合での界面組織形成に及ぼすSiおよびNi複合添加の影響2022

    • Author(s)
      鈴木聖顕
    • Organizer
      溶接学会春季全国大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Al/Fe異種金属接合の接合強度に及ぼすNiおよびZn複合添加の影響2022

    • Author(s)
      鈴木聖顕
    • Organizer
      溶接学会秋季全国大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Al/Fe異種金属接合における界面反応層形成に及ぼす元素複合添加の効果2022

    • Author(s)
      佐藤 裕
    • Organizer
      化学系学協会東北大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Strength improvement in dissimilar Al/steel weld by simultaneous addition of Si and Ni2022

    • Author(s)
      Kiyoaki T. Suzuki
    • Organizer
      The 6th International Symposium on Visualization in Joining and Welding Science through Advanced Measurements and Simulation
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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