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High deformability of Mg alloys via dual grain boundary segregation

Research Project

Project/Area Number 19K05068
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26040:Structural materials and functional materials-related
Research InstitutionNational Institute for Materials Science

Principal Investigator

SOMEKAWA Hidetoshi  国立研究開発法人物質・材料研究機構, 構造材料研究拠点, グループリーダー (50391222)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords材料工学 / マグネシウム / 粒界すべり / 溶質元素 / 偏析 / 粒界構造 / 力学特性 / 高速超塑性 / 粒界偏析 / 変形機構 / 粒界塑性
Outline of Research at the Start

マグネシウムの欠点である脆さと乏しい変形能を改善する室温粒界すべりは、粒界構造に極めて敏感である。これは、粒界すべりを補完する効果的な付随調整機構「補助」を結晶粒界に導入することによって、室温粒界すべりの更なる高速化の可能性を示唆している。本研究課題では、加工熱処理をともなう金属材料創製では回避できない『粒界偏析』に着目し、付随調整機構補助として活用する。特に、単一溶質元素ではなく、複数溶質元素の粒界偏析によって、粒界構造の再制御化と変形の補助化を図り、高速域を含めた幅広い変形速度(ひずみ速度)域にて延性能の付与を目指す。

Outline of Final Research Achievements

In order to consider the possibility for high deformability at room-temperature in high strain rate regimens, we examined the correlation between grain boundary structures and plastic deformation behavior using fine-grained Mg ternary alloys produced by several types wrought-processing. Microstructural observations revealed that grain boundary structures could be controlled by the wrought-processing method and types of alloying element. The results obtained from tensile and damping tests showed that the solute atoms which are segregated at grain boundaries affected the major deformation mechanism as well as room temperature ductility. The role of solute atoms on plastic deformation behavior in the present ternary alloys is also found to be the same as those in the binary alloys. The fracture of the alloys having a good deformability is owing to cavitation behavior, which is well-observed in the superplastic materials.

Academic Significance and Societal Importance of the Research Achievements

Mg合金の脆さと乏しい変形能/加工能の改善に関する昨今の主要な取組は、集合組織制御や合金化であり、転位すべり運動制御に基づくものである。本研究では、塑性変形機構に着目し、室温粒界すべりを活性化することで高速・高延性化を図り、Mg固有の問題解決となりうる新規手法を明示した。粒界すべりは、高温下で生じる超塑性で認知されるが、粒界構造を制御した微細結晶粒Mg合金で発現する室温粒界すべり挙動やその破壊様相は、高温下で観察できる従来超塑性材と類似することを特徴とする。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (26 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (13 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 12 results,  Open Access: 4 results) Presentation (10 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results) Book (1 results) Remarks (1 results)

  • [Int'l Joint Research] マサチューセッツ工科大(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Breakdown trade-off-relation of mechanical properties via micro-alloying in Mg-Mn alloys2022

    • Author(s)
      H. Somekawa, H. Fukuoka, A. Singh, H. Yamaura
    • Journal Title

      Metallurgical and Materials Transactions A

      Volume: 53A Issue: 3 Pages: 1110-1118

    • DOI

      10.1007/s11661-021-06581-2

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Precipitation of stable icosahedral quasicrystal phase in a Mg-Zn-Al alloy2022

    • Author(s)
      Singh Alok、Hiroto Takanobu、Ode Machiko、Takakura Hiroyuki、Tesar Karel、Somekawa Hidetoshi、Hara Toru
    • Journal Title

      Acta Materialia

      Volume: 225 Pages: 117563-117563

    • DOI

      10.1016/j.actamat.2021.117563

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spin Polarization of Mn Could Enhance Grain Boundary Sliding in Mg2022

    • Author(s)
      V. Wang, J. P. Du, H. Somekawa, S. Ogata, W. T. Geng
    • Journal Title

      Materials

      Volume: 15 Issue: 10 Pages: 3483-3483

    • DOI

      10.3390/ma15103483

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Microstructural evolution via purity grade of magnesium produced by high pressure torsion2021

    • Author(s)
      H. Somekawa, J. Yi, A. Singh, K. Tsuchiya
    • Journal Title

      Materials Science and Engineering A

      Volume: 823 Pages: 141735-141735

    • DOI

      10.1016/j.msea.2021.141735

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Non-Basal Dislocation Nucleation Site of Solid Solution Magnesium Alloy2020

    • Author(s)
      H. Somekawa, D. A. Basha, A. Singh, T. Tsuru, M. Yamaguchi
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 61 Issue: 6 Pages: 1172-1175

    • DOI

      10.2320/matertrans.MT-M2020040

    • NAID

      130007846148

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2020-06-01
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Change in damping capacity arising from twin-boundary segregation in solid-solution magnesium alloys2020

    • Author(s)
      H. Somekawa, D. A. Basha, A. Singh, T. Tsuru, H. Watanabe
    • Journal Title

      Philosophical Magazine Letters

      Volume: 100 Issue: 10 Pages: 494-505

    • DOI

      10.1080/09500839.2020.1805132

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Grain boundary relaxation behavior in meso-grained dilute magnesium alloys2020

    • Author(s)
      H. Somekawa, K. Naito, H. Watanabe
    • Journal Title

      Materialia

      Volume: 14 Pages: 100947-100947

    • DOI

      10.1016/j.mtla.2020.100947

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Grain boundary plasticity in solid solution Mg-Li binary alloy2020

    • Author(s)
      H. Somekawa, D. Egusa, E. Abe
    • Journal Title

      Materials Science and Engineering A

      Volume: 790 Pages: 139705-139705

    • DOI

      10.1016/j.msea.2020.139705

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Transition of dominant deformation mode in bulk polycrystalline pure Mg by ultra-grain refinement down to sub-micrometer2020

    • Author(s)
      R. Zheng, J. P. Du, S. Gao, H. Somekawa, S. Ogata, N. Tsuji
    • Journal Title

      Acta Materialia

      Volume: 198 Pages: 35-46

    • DOI

      10.1016/j.actamat.2020.07.055

    • NAID

      120006888479

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of texture and grain size during extrusion of ZA63 alloy containing stable quasicrystalline i-phase and its effect on tensile and compression strength2020

    • Author(s)
      K. Tesar, H. Somekawa, A. Singh
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 849 Pages: 156340-156340

    • DOI

      10.1016/j.jallcom.2020.156340

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] マグネシウムの現状と希薄合金化による特性の高度化2020

    • Author(s)
      染川英俊
    • Journal Title

      工業材料

      Volume: 68 Pages: 39-43

    • Related Report
      2020 Research-status Report
  • [Journal Article] Deformation behavior at room temperature ranges of fine-grained Mg-Mn system alloys2019

    • Author(s)
      H. Somekawa, D. A. Basha, A. Singh
    • Journal Title

      Materials Science and Engineering A

      Volume: 766 Pages: 138384-138384

    • DOI

      10.1016/j.msea.2019.138384

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Role of grain boundaries on ductility in Mg-Y alloys2019

    • Author(s)
      H. Somekawa, D. A. Basha, A. Singh
    • Journal Title

      Materialia

      Volume: 8 Pages: 100466-100466

    • DOI

      10.1016/j.mtla.2019.100466

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] マグネシウムの粒界塑性応答に及ぼす粒界拡散の影響2021

    • Author(s)
      染川英俊, 譯田真人
    • Organizer
      日本機械学会 M&M2021材料力学カンファレンス
    • Related Report
      2021 Annual Research Report
  • [Presentation] 粒界構造と添加元素制御によるマグネシウム合金の高延性化2021

    • Author(s)
      染川英俊, A. Singh, D. A. Basha
    • Organizer
      日本機械学会2021年年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] マグネシウムの現状と高性能化の可能性2020

    • Author(s)
      染川英俊
    • Organizer
      JASIS2020オープンソリューションフォーラム
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] 特性および内部組織に及ぼす溝ロール加工温度の影響2020

    • Author(s)
      染川英俊, 飯田一彦, 小林正樹, 檜原高明, 原由佳, 原徹
    • Organizer
      日本機械学会年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 力学特性および変形機構に及ぼす粒界偏析の影響2020

    • Author(s)
      染川英俊, D. A. Basha, A. Singh
    • Organizer
      2020年日本金属学会春期大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Wrought process and deformation kink bands formation of Mg alloys2019

    • Author(s)
      H. Somekawa
    • Organizer
      The Future of Materials Engineering - Dramatic Innovation to the next 100 years
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 双晶界面の局所変形応答に及ぼす溶質元素の影響2019

    • Author(s)
      染川英俊, D. A. Basha, A. Singh, 渡辺博行, 都留智仁
    • Organizer
      2019年日本金属学会秋期大会
    • Related Report
      2019 Research-status Report
  • [Presentation] In-situ observations of crack propagation behavior in Mg-Mn alloy2019

    • Author(s)
      D. A. Basha, 染川英俊, A. Singh
    • Organizer
      2019年日本金属学会秋期大会
    • Related Report
      2019 Research-status Report
  • [Presentation] マグネシウムのpop-in挙動に及ぼす結晶方位の影響2019

    • Author(s)
      染川英俊, 都留智仁, 三浦誠司, C. A. Schuh
    • Organizer
      M&M2019材料力学カンファレンス
    • Related Report
      2019 Research-status Report
  • [Presentation] Mg合金のマイクロピラー圧縮変形におけるY元素の効果2019

    • Author(s)
      松中大介, 松井将也, 渋谷陽二, 染川英俊
    • Organizer
      M&M2019材料力学カンファレンス
    • Related Report
      2019 Research-status Report
  • [Book] マグネシウム合金の最先端技術と応用展開2020

    • Author(s)
      監修:河村能人, 千野靖正 (分担執筆)
    • Publisher
      CMC出版
    • ISBN
      9784781315058
    • Related Report
      2020 Research-status Report
  • [Remarks] NIMS研究者総覧_SAMURAI

    • URL

      https://samurai.nims.go.jp/profiles/somekawa_hidetoshi

    • Related Report
      2021 Annual Research Report 2020 Research-status Report 2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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