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Multiscale Crystal Plasticity Analysis for Production of Ultrafine-Grained Metals Based on Self-Organization of Subgrain

Research Project

Project/Area Number 16560078
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionKeio University

Principal Investigator

SHIZAWA Kazuyuki  Keio University, Faculty of Science and Technology, Professor, 理工学部, 教授 (80211952)

Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsDislocation cell structure / Subgrain / Self-organization / Polycrystal / Ultrafine-grained metal / Multiscale modeling / Reaction-diffusion equations / Crystal plasticity analysis / セル再分割
Research Abstract

Ultrafine-grained metals (UFGM) have attracted interest as high-strength materials. It is expected in the field of material textures control that a microscopic mechanism of production process for the UFGM is numerically predicted. However, such a study has never been reported. In this study, aiming at a prediction of production process of UFGM, reaction-diffusion equations are rigorously derived, that describe the self-organization of dislocation cell structure and subgrain. A stress effect model for rate coefficients of the reaction-diffusion equations is proposed so as to reflect the information of resolved shear stress of a crystal on dislocation patterning. In order to extend this self-organization model to a model for polycrystal, a dislocation reaction term is improved so that it can express an accumulation of geometrically necessary (GN) dislocation on grain boundary and a decrease of dislocation annihilation ratio near the boundary. A difference of stage transition timing for t … More hree-stage hardening of a crystal due to difference between the initial orientations of grain is introduced into the stress effect coefficient model and a dislocation mean free path model. Furthermore, substituting the immobile dislocation density calculated from the reaction-diffusion equations into a hardening modulus of a crystal, a multiscale crystal plasticity model is developed, that couples the dislocation patterning and polycrystal deformation.
A multiscale crystal plasticity simulation using a FDM for dislocation patterning and a FEM for crystal deformation is carried out applying this model to a compression problem of an FCC polycrystal plate under severe strain condition. It is numerically predicted that the cell structure in the micrometer size is formed in a grain and the GN dislocations are accumulated around grain boundary in stage II. It is also reproduced that a lot of micro shear bands generate and subgrain walls with accumulated GN dislocations are formed along the shear bands in stage III. The timing of transition from cell to subgrain is different depending on the resolved shear stress condition of each grain. Moreover, the generation process of ultrafine grain is appropriately visualized and it is clarified that GN boundaries are induced in a grain by applying severe strain locally over 2 and a grain is separated along the GN boundaries into plural fine grains in the sub-micron order with large angle boundary. This study lays a foundation of multiscale simulation that enables computationally to predict the production process of UFGM on the basis of dislocation behaviors. Less

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (22 results)

All 2006 2005 2004

All Journal Article (22 results)

  • [Journal Article] Modeling and Simulation of Crystal Plasticity Based on GN Crystal Defects for Ultrafine0Grained Metals Induced by Severe Plastic Deformation2006

    • Author(s)
      Shingo Oishi
    • Journal Title

      Namomaterials by Severe Plastic Deformation, Materials Science Forum 503-504

      Pages: 215-220

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dislocation-Crystal Plasticity Simulation Based on Self-Organization for Repartition of Dislocation Cell Structures and Subgrains2006

    • Author(s)
      Naoshi Yamaki
    • Journal Title

      Nanomaterials by Severe Plastic Deformation, Materials Science Forum 503-504

      Pages: 989-994

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 幾何学的に必要な転位密度および不適合度を考慮した転位-結晶塑性大変形シミュレーション2006

    • Author(s)
      青柳 吉輝
    • Journal Title

      日本機械学会論文集 A編 72・719 (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 幾何学的に必要な結晶欠陥を考慮した結晶粒超微細化に関する転位-結晶塑性シミュレーション2006

    • Author(s)
      青柳 吉輝
    • Journal Title

      日本機械学会論文集 A編 (未定)(掲載決定)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Modeling and Simulation of Crystal Plasticity Based on GN Crystal Defects for Ultrafine-Grained Metals Induced by Severe Plastic Deformation2006

    • Author(s)
      Shingo Oishi
    • Journal Title

      Nanomaterials by Severe Plastic Deformation, Materials Science Forum Vol.503-504

      Pages: 215-220

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dislocation-Crystal Plasticity Simulation Based on Self Organization for Repartition of Dislocation Cell Structures and Subgrains2006

    • Author(s)
      Naoshi Yamaki
    • Journal Title

      Nanomaterials by Severe Plastic Deformation, Materials Science Forum Vol.503-504

      Pages: 989-994

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] A Dislocation-Crystal Plasticity Simulation on Large Deformation Considering Geometrically Necessary Dislocation Density and Incompatibility (1st Report, Definitions of GN Crystal Defects and Multiscale Modeling)2006

    • Author(s)
      Yoshiteru Aoyagi
    • Journal Title

      Transactions of the Japan Society of Mechanical Engineers 72-719(in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dislocation-Crystal Plasticity Simulation on Formation Process of Ultrafine-Grains Based on Geometrically Necessary Crystal Defects2006

    • Author(s)
      Yoshiteru Aoyagi
    • Journal Title

      Transactions of the Japan Society of Mechanical Engineers, tba (accepted for publication)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dislocation Patterning for Cell Structures and Subgrains in Polycrystal2005

    • Author(s)
      Naoshi Yamaki
    • Journal Title

      Proceeding of ICCES'05 : International Conference on computational & Experimental Engineering and Sciences 1-10

      Pages: 1476-1481

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dislocation Patterning for Cell Structures and Subgrains in Polycrystal2005

    • Author(s)
      Naoshi Yamaki
    • Journal Title

      Proceeding of ICCES'05 : International Conference on Computational & Experimental Engineering and Sciences 1-10

      Pages: 1476-1481

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 強ひずみ付与による結晶粒微細化に関するGN転位-結晶塑性シミュレーション2005

    • Author(s)
      青柳 吉輝
    • Journal Title

      日本材料学会第54期学術講演会講演論文集

      Pages: 341-342

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Modeling and Simulation of Crystal Plasticity Based on GN Crystal Defects for Ultrafine-Grained Metals Induced by Severe Plastic Deformation2005

    • Author(s)
      Shingo Oishi
    • Journal Title

      Proceedings of NanoSPD3 : The 3rd International Conference on Nanomaterials by Severe Plastic Deformation

      Pages: 215-220

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Dislocation-Crystal Plasticity Simulation Based on Self-Organization for Repartition of Dislocation Cell Structures and Subgrains2005

    • Author(s)
      Naoshi Yamaki
    • Journal Title

      Proceedings of NanoSPD3 : The 3rd International Conference on Nanomaterials by Severe Plastic Deformation

      Pages: 989-994

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 結晶粒微細化および寸法効果に関するGN転位-結晶塑性シミュレーション2005

    • Author(s)
      海宝 寿実雄
    • Journal Title

      日本機械学会第18回計算力学講演会講演論文集 No.05-2

      Pages: 89-90

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 多結晶体における転位パターニングを考慮した転位-結晶塑性シミュレーション2005

    • Author(s)
      堀部 尚裕
    • Journal Title

      日本機械学会第18回計算力学講演会講演論文集 No.05-2

      Pages: 493-494

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Dislocation Patterning for Cell Structures and Subgrains in Polycrystal2005

    • Author(s)
      Naoshi Yamaki
    • Journal Title

      Proceeding of ICCES'05 : International Conference on Computational & Experimental Engineering and Sciences

      Pages: 1476-1481

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Multiscale Modeling and Simulation on Formation of Ultrafine-Grained Metals Based on Self-Organization of Cell Structures and Subgrains2005

    • Author(s)
      Kazuyuki Shizawa
    • Journal Title

      Proceedings of Plasticity '05 : the 11th International Symposium on Plasticity and Its Current Applications

      Pages: 457-459

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 転位セル構造の再分割に関する自己組織化を考慮した転位-結晶塑性シミュレーション2005

    • Author(s)
      山本 直
    • Journal Title

      第54回理論応用力学講演会講演論文集

      Pages: 299-300

    • Related Report
      2004 Annual Research Report
  • [Journal Article] A Crystal Plasticity Analysis for Accumulations of Geometrically Necessary Dislocations and Dipoles around Shear Band2004

    • Author(s)
      Yoshiteru Aoyagi
    • Journal Title

      Mesoscopic Dynamics on Fracture Process and Materials Strength

      Pages: 87-96

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 超微細サブグレインの自己組織化に関する転位-結晶塑性シミュレーション2004

    • Author(s)
      志澤 一之
    • Journal Title

      日本材料学会第53期学術講演会講演論文集

      Pages: 467-468

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Modeling and Simulation of Multiscale Crystal Plasticity Based on Self-Organization of Dislocation Cell and Subgrain for Production of Ultrafine-Grained Metals2004

    • Author(s)
      Yoshiteru Aoyagi
    • Journal Title

      Final Program of 2004 ASME/JSME Pressure Vessels and Piping Division Conference

      Pages: 40-40

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 転位セル構造の再分割に関する自己組織化モデルとシミュレーション2004

    • Author(s)
      安藤 哲朗
    • Journal Title

      日本機械学会第17回計算力学講演会講演論文集 04・40

      Pages: 273-274

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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