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A novel method for overcoming the strength-ductility trade-off of titanium and titanium alloys by high-density pulsed electric current

Research Project

Project/Area Number 22K20408
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionNagoya University

Principal Investigator

Gu Shaojie  名古屋大学, 工学研究科, 特任助教 (00966830)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsマルテンサイト変態 / ヘテロ構造 / 高密度パルス電流 / 純チタンとチタン合金 / 強度と延性の向上 / 整合界面
Outline of Research at the Start

材料の強度と延性は構造設計に不可欠である。強くて延性のある材料は、構造物の寿命を延ばし、省エネ上で重要な役割を果たす。ただし、強度と延性のトレードオフとして知られているように、いずれかの側を大きくすると、必然的に他方が損傷する。本研究では、高密度電流処理によって純チタンおよびチタン合金の強度と延性を同時に向上させる方法を発見する。微細構造により、多数の整合界面を持つマルテンサイトの生成に関連している可能性が示唆された。本研究の目的は、このような構造が生成される理由を解明することである。研究成果は、マルテンサイト相 (脆くて硬い) に対する偏見を打ち破り、航空製造業界に革命を起こす可能性がある。

Outline of Final Research Achievements

This study successfully utilized high-density pulsed current treatment technology to simultaneously enhance the strength and ductility of pure titanium and titanium alloys. Generally, the mechanical properties of materials follow the natural law of the strength-ductility trade-off, meaning that improving one inevitably compromises the other. In this study, the use of high-density pulsed current treatment enabled the rapid heating and cooling of the material, forming a heterogeneous structure that includes chemical composition and microstructural inhomogeneities, thereby overcoming the strength-ductility dilemma. In the future, the method proposed in this study can be applied to other materials to enhance their mechanical properties. This is expected to contribute to sustainable material design and manufacturing, as well as the realization of a carbon-neutral society.

Academic Significance and Societal Importance of the Research Achievements

本研究は、加熱速度が10^6°C/sに達する高密度パルス電流処理によって、二相α/βチタン合金材料が条状α相、残存α相、マルテンサイトα'相、及び残存β相を含む混合異質微細構造を形成することを初めて発見した。これは、従来の熱処理方法では実現が難しいものである。この混合構造は、材料の微細構造を強区と弱区に分け、それらの協働作用によって強度と延性のトレードオフを打破した。この研究成果は、高密度パルス電流処理法を用いて他の類似した二相構造材料を処理するための基礎と根拠を提供する。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (15 results)

All 2024 2023 2022 Other

All Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 5 results) Remarks (4 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Ultrahigh deformability of Ti-6Al-4V assisted by high-density pulsed electric current treatment2024

    • Author(s)
      Gu Shaojie、Liu Chang、Toku Yuhki、Kimura Yasuhiro、Yoon Sungmin、Li Shaoli、Cui Yi、Ju Yang
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 973 Pages: 172892-172892

    • DOI

      10.1016/j.jallcom.2023.172892

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Microstructural modification and mechanical improvement of ultrafine-grained Ti alloy through electron wind force: An innovative approach2024

    • Author(s)
      Tang Yongpeng、Ju Yang、Gu Shaojie、Wang Qing、Kimura Yasuhiro、Toku Yuhki、Iikubo Satoshi
    • Journal Title

      Materials Science and Engineering: A

      Volume: 891 Pages: 145845-145845

    • DOI

      10.1016/j.msea.2023.145845

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Micromachined Structures Decoupling Joule Heating and Electron Wind Force2024

    • Author(s)
      Shaojie Gu、Yasuhiro Kimura、Xinming Yan、Chang Liu、Yi Cui、Yang Ju、Yuhki Toku
    • Journal Title

      Nature Communications

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of high-density pulsed electric current on residual stress relief and microstructural modification of cold-bent commercially pure titanium2023

    • Author(s)
      Li Shaoli、Gu Shaojie、Yoon Sungmin、Kimura Yasuhiro、Toku Yuhki、Liu Bin、Ju Yang
    • Journal Title

      Materials Today Communications

      Volume: 37 Pages: 107082-107082

    • DOI

      10.1016/j.mtcomm.2023.107082

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Realizing strength?ductility synergy in a lean duplex stainless steel through enhanced TRIP effect via pulsed electric current treatment2023

    • Author(s)
      Gu Shaojie、Liu Chang、Kimura Yasuhiro、Yoon Sungmin、Cui Yi、Yan Xinming、Ju Yang、Toku Yuhki
    • Journal Title

      Materials Science and Engineering: A

      Volume: 883 Pages: 145534-145534

    • DOI

      10.1016/j.msea.2023.145534

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Exploring the healing effects of electric current treatment on cracks: a comprehensive analysis of crack-scale factors2023

    • Author(s)
      S. Gu, S. Yoon, C. Liu, X. Yan, Y. Kimura, Y. Toku, Y. Ju
    • Organizer
      ATEM-iDICs '23
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Inhibiting fatigue crack initiation in Nickel-based superalloys GTD-111 by high-density pulsed electric current treatment2023

    • Author(s)
      X. Yan, S. Yoon, S. Gu, Y. Kimura, Y. Toku, Y. Ju
    • Organizer
      ATEM-iDICs '23
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Damage-healing induced enhancement of fatigue properties of austenitic stainless steel by high-density pulsed electric current: A continuum damage mechanics-based assessment2023

    • Author(s)
      S. Yoon, Y. Kimura, S. Gu, Y. Toku, Y. Ju
    • Organizer
      ATEM-iDICs '23
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Microstructural Modification and Mechanical Properties Improvement of Titanium and Titanium Alloys through High-Density Pulsed Electric Current2023

    • Author(s)
      R. Iwase, Y. Marumoto, S. Gu, Y. Kimura, Y. Toku, Y. Ju
    • Organizer
      4th International Conference on Materials Science & Engineering, Houston, USA
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Enhancement of Mechanical Properties of Ti-6Al-4V through High-Density Pulsed Electric-Current2022

    • Author(s)
      R. Iwase, S. Gu, Y. Kimura, Y. Toku, Y. Ju
    • Organizer
      3rd International Conference on Materials Science & Engineering, Boston, USA
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Remarks] 名古屋大学ホームページ

    • URL

      https://profs.provost.nagoya-u.ac.jp/html/100012346_ja.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/gushaojie0418

    • Related Report
      2023 Annual Research Report
  • [Remarks] 出願中の産業財産権

    • URL

      https://profs.provost.nagoya-u.ac.jp/html/100012346_ja.html#item_idstrl_prop_div_minus

    • Related Report
      2022 Research-status Report
  • [Remarks] 講演・口頭発表等

    • URL

      https://profs.provost.nagoya-u.ac.jp/html/100012346_ja.html#item_idstrl_prop_div_minus

    • Related Report
      2022 Research-status Report
  • [Patent(Industrial Property Rights)] 金属の機械特性向上方法2022

    • Inventor(s)
      巨陽、丸本裕貴、顧少杰、尹盛文、岩瀬累
    • Industrial Property Rights Holder
      国立大学法人東海国立大学機構
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2022-049181
    • Filing Date
      2022
    • Related Report
      2022 Research-status Report

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Published: 2022-09-01   Modified: 2025-01-30  

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