Microdynamic Analysis on Advanced Materials Containing Ultra-High Density Lattice Defects

2008 Fiscal Year Final Research Report

• Project/Area Number: 18062004
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Osaka University
• Principal Investigator: NAKATANI Akihiro Osaka University, 大学院・工学研究科, 教授 (50252606)
• Co-Investigator(Kenkyū-buntansha): SHIMOKAWA Tomotsugu 金沢大学, 機構工学系, 講師 (40361977) ; SAITOH Ken-ichi 関西大学, システム理工学部, 準教授 (90294032) ; MATSUSHIMA Takashi 筑波大学, 大学院・システム情報工学研究科, 准教授 (60251625)
• Project Period (FY): 2006 – 2008
• Keywords: 巨大ひずみ / 計算力学 / 分子動力学法 / 格子欠陥 / 多結晶体 / 離散転位動力学法 / 粒子法 / 結晶粒界

Research Abstract

金属が大きく変形させられると内部に結晶格子の不整合が導入され、結晶の粒が細分化されます。この格子不整合や結晶粒は金属の持つ性質を変化させ、高い機能を持つ環境に優しい材料を創り出す可能性を秘めています。この課題では原子レベルから格子不整合の集合体レベル、さらには、結晶粒の集合体について最先端の計算力学理論に基づいたコンピューターシミュレーションを駆使し、内部構造変化のメカニズムと特性の関係を解明しました。

Research Products

• [Journal Article] Effect of Extrinsic Grain Boundary Dislocations on Mechanical Properties of Ultrafine-Grained Metals by Molecular Dynamics Simulations (2009)
  • Author(s): T. Shimokawa, T. Hiramoto, T. Kinari, and S. Shintaku
  • Journal Title: Materials Transactions 50(1) Pages: 2-10
  • Peer Reviewed
• [Journal Article] Brittle-ductile transition in low carbon steel deformed by the accumulative roll bonding process (2009)
  • Author(s): M. Tanaka, K. Higashida, T. Shimokawa, and T. Morikawa
  • Journal Title: Materials Transactions 50(1) Pages: 56-63
  • Peer Reviewed
• [Journal Article] SPH Analysis of ECAP Process by Using Grain Refinement Model (2009)
  • Author(s): Ken-ichi Saitoh and Yuuki Ohnishi
  • Journal Title: Materials Transactions 50(1) Pages: 19-26
  • Peer Reviewed
• [Journal Article] 分子動力学法によるNi結晶中の水素拡散挙動とその素過程の解析 (2008)
  • Author(s): 政家利彦・土井祐介・中谷彰宏
  • Journal Title: 材料 57(8) Pages: 774-779
  • Peer Reviewed
• [Journal Article] 原子スケール計算機実験による積層欠陥エネルギーの異なるナノ結晶体の粒界構造と力学特性の関係 (2008)
  • Author(s): 下川智嗣・喜成年泰・新宅救徳
  • Journal Title: 材料 57(8) Pages: 761-767
  • Peer Reviewed
• [Journal Article] Atomistic modelling of reversible phase transformations in Ni-Ti alloys : A molecular dynamics study (2008)
  • Author(s): T. Sato, K. Saitoh and N. Shinke
  • Journal Title: Materials Science and Engineering A 481-482 Pages: 250-253
  • Peer Reviewed
• [Journal Article] 機械工学年鑑(3.計算力学 3.2 計算固体力学) (2008)
  • Author(s): 中谷彰宏
  • Journal Title: 日本機械学会誌 111(1077) Pages: 646-647
• [Journal Article] 弾性剛性係数を用いた準連続体モデルの自動要素分割に関する研究 (2008)
  • Author(s): 下川智嗣・喜成年泰・新宅救徳
  • Journal Title: 日本機械学会論文集A編 74 Pages: 27-33
  • Peer Reviewed
• [Journal Article] Microstructural evolution in crystalline metal induced by plastic deformation-Atomistic study of grainsubdivision in tension, torsion and rolling- Solid Mechanics and its Applications (2007)
  • Author(s): A. Nakatani and T. Shimokawa
  • Journal Title: 144 Pages: 25-35
  • Peer Reviewed
• [Journal Article] Dislocation-Grain Boundary Interactions by the Quasicontinuum Method (2007)
  • Author(s): T. Shimokawa, T. Kinari and S. Shintaku
  • Journal Title: Key Engineering Materials 341 Pages: 973-978
  • Peer Reviewed
• [Journal Article] Interaction mechanism between edge dislocations and asymmetrical tilt grain boundaries investigated via quasicontinuum simulations (2007)
  • Author(s): T. Shimokawa, T. Kinari and S. Shintaku
  • Journal Title: Physical Review B 75 Pages: 144108
  • Peer Reviewed
• [Journal Article] Atomic simulations on the grain subdivision of a crystalline metal (2007)
  • Author(s): T. Shimokawa, T. Kinari and S. Shintaku
  • Journal Title: Materials Science Forum 561-565 Pages: 1983-1986
  • Peer Reviewed
• [Journal Article] 原子シミュレーションによるAlおよびCuナノ結晶中の欠陥構造に関するエネルギー論的研究 (2007)
  • Author(s): 下川智嗣・平本知之・喜成年泰・新宅救徳
  • Journal Title: 材料 56 Pages: 1068-1075
  • Peer Reviewed
• [Presentation] A Multiscale Modeling of Grain Boundary Characteristics in Aluminum (2008)
  • Author(s): A. Nakatani and Y. Mukudai
  • Organizer: International Symposium on Giant Straining Process for Advanced Materials (GSAM-2008)
  • Place of Presentation: Fukuoka
  • Year and Date: 20081121-24
• [Presentation] Molecular dynamics study of ductile fracture near crack tip field in nanocrystalline aluminum (2008)
  • Author(s): C. Urabe, T. Ogawa, and A. Nakatani
  • Organizer: International Symposium on Giant Straining Process for Advanced Materials (GSAM-2008)
  • Place of Presentation: Fukuoka
  • Year and Date: 20081121-24
• [Presentation] The Effect of Severe Plastic Deformation on the Brittle-Ductile Transition in Low Carbon Steel (2008)
  • Author(s): K. Higashida, M. Tanaka, S. Horiuchi and T. Shimokawa
  • Organizer: International Symposium on Giant Straining Process for Advanced Materials (GSAM-2008)
  • Place of Presentation: Fukuoka
  • Year and Date: 20081121-24
• [Presentation] Grain Boundary of SPD Material -TEM and MD Structures- (2008)
  • Author(s): H. Nakashima, T. Isobe, S. Hata, K. Ikeda and T. Shimokawa
  • Organizer: International Symposium on Giant Straining Process for Advanced Materials (GSAM-2008),
  • Place of Presentation: Fukuoka
  • Year and Date: 20081121-24
• [Presentation] SPH analysis of ECAP process by using grain refinement model (2008)
  • Author(s): K. Saitoh and Y. Ohnishi
  • Organizer: International Symposium on Giant Straining Process for Advanced Materials (GSAM-2008)
  • Place of Presentation: Fukuoka
  • Year and Date: 20081121-24
• [Presentation] Study on Deformation of Vesicle Membrane based on Evolution of Topological Defects (2008)
  • Author(s): A. Nakatani and Y. Shobatake
  • Organizer: XXII International Congress of Theoretical and Applied Mechanics (ICTAM2008)
  • Place of Presentation: Adelaide, Australia
  • Year and Date: 20080824-29
• [Presentation] SPH Simulation of Severe Plastic Deformation Process of Polycrystals, International Conference in Plasticity (2008)
  • Author(s): T. Matsushima and T. Kameda
  • Organizer: 2008 and its Current Applications
  • Place of Presentation: Kailua-Kona, Hawaii, U.S.A.
  • Year and Date: 20080100
• [Remarks]
  • URL: http://www.md.ams.eng.osaka-u.ac.jp/giantstrain/