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Improvement of tensile and fatigue properties in CoCrFeNi type high-entropy alloys by high-density pulsed electric current

Research Project

Project/Area Number 23K13218
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionNagoya University

Principal Investigator

尹 盛文  名古屋大学, 工学研究科, 特任助教 (70965160)

Project Period (FY) 2023-04-01 – 2025-03-31
Project Status Granted (Fiscal Year 2023)
Budget Amount *help
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2024: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2023: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsHigh Entropy Alloy / CoCrFeMnNi / SPS / Sintering / Compression / Fatigue / Molecular dynamics / Dislocation / 高エントロピー合金 / 引張及び疲労損傷 / 電流印加法 / 結晶組織制御 / 分子動力学シミュレーション
Outline of Research at the Start

本研究では放電プラズマ焼結法を利用して作製されたCoCrFeNi系高エントロピー合金の多孔性と微小き裂および引張と疲労損傷に対して電流印加法を適用し、材料の損傷修復および結晶組織制御を目的としている。これは、近年新たな構造用材料として脚光を浴びている高エントロピー合金の力学特性向上に関する学術的・挑戦的研究である。粒界工学とマルチスケール解析による電流印加条件の最適化は、本材料の引張および疲労特性の向上を導き、長寿命化および高性能化に寄与する。

Outline of Annual Research Achievements

In order to clarify the optimized state between the fabrication condition by spark plasma sintering and mechanical properties of the sintered CoCrFeMnNi high entropy alloy, the compressive testing for determining strength and fatigue properties was performed based on a series of sintering conditions. In the simulation, variations in temperature range and pressure level are set by giving parameters within the range selected by prior investigation of experimental works. Microstructural evolution under compressive deformation was also examined. Dislocation and phase analysis were performed by molecular dynamics simulation. This study contributes to understanding the compressive strength and fatigue characteristics based on the sintered state of CoCrFeMnNi high entropy alloy.

Current Status of Research Progress
Current Status of Research Progress

1: Research has progressed more than it was originally planned.

Reason

The optimization process for the sintered state and the compression fatigue test were completed. The result met the original target value and simulation is being conducted for quantitative evaluation of the result.

Strategy for Future Research Activity

The deformation mechanism due to temperature conditions and tensile/compressive speed conditions will be investigated. A multiscale simulation will be performed by conducting finite element and molecular dynamics simulations, and the future results wiil be compared and analyzed with experimental views.

Report

(1 results)
  • 2023 Research-status Report
  • Research Products

    (9 results)

All 2024 2023

All Journal Article (7 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Fatigue damage recovery and enhanced fatigue limit of austenitic stainless steel using multiple high-density pulsed electric currents2024

    • Author(s)
      Yoon Sungmin、Kimura Yasuhiro、Ju Yang、Toku Yuhki
    • Journal Title

      International Journal of Pressure Vessels and Piping

      Volume: 209 Pages: 105178-105178

    • DOI

      10.1016/j.ijpvp.2024.105178

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Suppressing fatigue crack growth owing to welded joints of duplex stainless steel subjected to multiple high-density pulsed electric currents2024

    • Author(s)
      YOON Sungmin、MORII Masato、KIMURA Yasuhiro、TOKU Yuhki
    • Journal Title

      Mechanical Engineering Journal

      Volume: 11 Issue: 4 Pages: 24-00015-24-00015

    • DOI

      10.1299/mej.24-00015

    • ISSN
      2187-9745
    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Molecular dynamics study of nanostructured polycrystalline CoCrCuFeNi high entropy alloy concerning temperature dependence of deformation-induced phase transformation2024

    • Author(s)
      YOON Sungmin、KIMURA Yasuhiro、TOKU Yuhki
    • Journal Title

      Mechanical Engineering Journal

      Volume: 11 Issue: 4 Pages: 23-00551-23-00551

    • DOI

      10.1299/mej.23-00551

    • ISSN
      2187-9745
    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High Temperature Tensile and Compressive Behaviors of Nanostructured Polycrystalline AlCoCrFeNi High Entropy Alloy: A Molecular Dynamics Study2023

    • Author(s)
      Yoon Sungmin、Kimura Yasuhiro、Uchida Motoki、Ju Yang、Toku Yuhki
    • Journal Title

      Journal of Engineering Materials and Technology

      Volume: 146 Issue: 2

    • DOI

      10.1115/1.4063802

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Overcoming the trade-off between strength and ductility in austenitic stainless steel using a high-density pulsed electric current2023

    • Author(s)
      Yoon Sungmin、Kimura Yasuhiro、Toku Yuhki、Ju Yang
    • Journal Title

      Materialia

      Volume: 32 Pages: 101922-101922

    • DOI

      10.1016/j.mtla.2023.101922

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Thermal stress-assisted formation of submicron pillars from a thin film of CoCrCuFeNi high entropy alloy: experiments and simulations2023

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

      RSC Advances

      Volume: 13 Issue: 41 Pages: 28513-28526

    • DOI

      10.1039/d3ra04759h

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Efficiency improvement of fatigue crack healing by multiple high-density pulsed electric currents: Application to austenitic stainless steel2023

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

      Engineering Fracture Mechanics

      Volume: 284 Pages: 109235-109235

    • DOI

      10.1016/j.engfracmech.2023.109235

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 分子動力学シミュレーションによるAlCoCrFeNi高エントロピー合金の高温引張圧縮特性の解析2023

    • Author(s)
      Sungmin Yoon, Yasuhiro Kimura, Yuhki Toku
    • Organizer
      M&M・CMD 若手シンポジウム 2023
    • Related Report
      2023 Research-status Report
  • [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)
      Sungmin Yoon, Yasuhiro Kimura, Shaojie Gu, Yuhki Toku, Yang Ju
    • Organizer
      ATEM-iDICs 2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research

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Published: 2023-04-13   Modified: 2024-12-25  

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