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Collective Mechanical Behavior of dislocation Network Developed under Indentation

Research Project

Project/Area Number 13450047
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

SHIBUTANI Yoji  Osaka Univ., Graduate School of Eng., Prof., 大学院・工学研究科, 教授 (70206150)

Co-Investigator(Kenkyū-buntansha) HIGASHIDA Kenji  Kyushu Univ., Graduate School of Eng., Asso. Prof., 大学院・工学研究科, 助教授 (70156561)
KOYAMA Atsuhiro  Osaka Univ., Graduate School of Eng., Research Associate, 大学院・工学研究科, 助手 (40324800)
OGATA Shigenobu  Osaka Univ., Graduate School of Eng., Assis. Prof., 大学院・工学研究科, 講師 (20273584)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 2002: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 2001: ¥9,200,000 (Direct Cost: ¥9,200,000)
KeywordsNanoindentation / Dislocation emission / Collective mechanics / Focus ion beam technique / Molecular Dynamics / Discrete dislocation / Multiscale modeling / 転位網 / FIB-TEM / 単結晶シリコン / 単結晶アルミニウム
Research Abstract

Cross sections of the indent-induced plastic zones is single crystalline silicon and aluminum are observed by the transmission electron microscopy (TEM) in order to know their internal structural changes under indentation. A tiny piece involving the indented region is cut from the sample and thinned until a few hundred nanometer thickness by means of the Focus Ion Beam (FIB) technique. At the case of silicon, the hydrostatic pressure-induced phase transition recovers to the diamond structure with the different crystallographic orientation from the bulk after unloading, being compared with the sample having received the heat treatment for recrystallization. Perfect dislocations consisting of the 60 degree dislocations and screw dislocations may be emitted from the boundary between the phase transition and the diamond bulk. Emission and movemeat mechanism of the dislocation are also investigated with help of the molecular dynamics simulations. On the other hand, it is found at the case o … More f single crystalline aluminum that the subgrains less than one micron are organized at the maximum shear stress region. It seems to be one of the self-organization of dislocation network as a result of the collective mechanical behaviors.
New finding of unstable displacement burst observed in the relation between the indent load and indent depth of a nanoindentation test is much possible to be related to dislocation emission. In the present research, the dislocation emission and the prismatic dislocation loop formation in a single crystalline aluminum are simulated by the molecular dynamics. Effects of the stress distribution due to two different types of indenters and of the interatomic description by three different embedded atom type potentials are discussed with much emphasis. At a result, the dislocations are emitted from the severely damaged surface atomic layer due to the indenter and the prismatic dislocation loops, which have the same gliding direction but not on the glide plane, are attained by unstable reaction between the shear loops emitted from the surface and cross slip mechanism. Less

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report

Research Products

(21 results)

All Other

All Publications

  • [Publications] S.ogata, N.Hirosaki, C.Kocer, Y.shibutani: "An ab initio study of the ideal tensile and shear strength of single-crystal β-Si_3N_4"J.Mater.Res.. 18・5. 1168-1172 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y.Shibutani, A.Koyama, T.Tsuru: "Collective Dislocation Behavior in Single Crystalline Aluminum under Indentation"IUTAM Symposium on Multiscale Modeling and Characterization of Elastic-Inelastic Behavior of Engineering Materials(Kluwer). (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 渋谷陽二, 小山敦弘, 永原直哉, 大屋広明, 冨田佳宏: "単結晶材料の微小硬度の上昇(シリコンとアルミニウムの場合)"日本機械学会論文集(A編). 68巻675号. 1520-1526 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S.Ogata, J.Li, S.Yip: "Ideal Pure Shear Strength of Aluminum and Copper"Science. Vol.298. 807-811 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 渋谷陽二, 他: "カーボンナノチューブの合成・評価、実用化とナノ分散・配合制御技術"技術情報協会. 312 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Ogata, N. Hirosaki, C. Kocer and Y. Shibutani: "An ab initio study of the ideal tensile and shear strength of single-crystal β-Si_3N_4"J. Mater. Res.. Vol.18, No.5. 1168-1172 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Shibutani, A. koyama and T. Tsuru: "Collective Disloction Behavior in single Crystalline Aluminum under Indentation"IUTAM Symposium on multiscale modeling and Characterization of elastic-Inelastic Behavior of Engineering. in print. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Y. Shibutani, A, koyania, N. Nagahara, H. Ouya and Y. Tomita: "Increase of Microhardness of Single Crystals (Cases of Silicon and Aluminum)"Trans. Japan Soc. of Mech. Engineers. Vol.68, No.675. 1520-1526 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] S. Ogata, J. Li and S. Yip: "Ideal Pure Shear Strength of Aluminum and Copper"Science. Vol.298. 807-811 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 渋谷陽二, 小山敦弘, 永原直哉, 大屋広明, 冨田佳宏: "単結晶材料の微小硬度の上昇(シリコンとアルミニウムの場合)"日本機械学会論文集(A編). 68巻675号. 1520-1526 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Shigenobu Ogata, Ju Li, Sidney Yip: "Ideal Pure Shear Strength of Aluminum and Copper"Science. Vol.298. 807-811 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 渋谷陽二, 都留智仁: "単結晶アルミニウムのナノインデンテーション下での転位の射出と転位間相互作用"第52回理論応用力学講演会講演論文集. 213-216 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 釘宮哲也, 川上崇, 尾方成信, 渋谷陽二: "シリコン単結晶のせん断変形に対する原子間ポテンシャルの妥当性"日本機械学会2002年度年次大会講演論文集. VI. 227-228 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 渋谷陽二: "大規模MD法と非平衡系のダイナミクス"日本機械学会2002年度年次大会講演論文集. VIII. 261-262 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小山敦弘, 渋谷陽二, 寺山暢之: "ナノインデンテーションによるDLC薄膜の強度評価"日本機械学会M&Mレイクサイドサマーシンポジウム講演論文集. 67-70 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 小山敦弘, 永原直哉, 丹野誠, 渋谷陽二, 冨田佳宏: "DLC薄膜の圧子押込みによる強度評価法の検討"日本機械学会2001年度年次大会講演論文集. vol.1. 275-276 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 青野芳大, 渋谷陽二, 山中圭史: "弾性解を利用した分子動力学法によるシリコン材の圧子押込み下での転位の射出とループの形成"日本機械学会2001年度年次大会講演論文集. vol.5. 17-18 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 渋谷陽二, 青野芳大, 小山敦弘: "シリコンのインデンテーション下での転位網の発達-分子動力学シミュレーションによる転位ループの解析-"第14回計算力学講演会講演論文集. 01-10. 69-70 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 永原直哉, 小山敦弘, 渋谷陽二: "FIB-TEMによるインデンテーション直下の内部構造の観察と微小硬度評価"日本機械学会関西支部 第77期定時総会講演会講演予定.

    • Related Report
      2001 Annual Research Report
  • [Publications] 前田太郎, 渋谷陽二: "変位の2次勾配を考慮したひずみ勾配理論による軸対象圧子押込み弾塑性解析"日本機械学会関西支部 第77期定時総会講演会講演予定.

    • Related Report
      2001 Annual Research Report
  • [Publications] 青野芳大, 小山敦弘, 渋谷陽二: "分子動力学法による単結晶シリコンの圧子押込みによる転位の射出と内部構造の変化"日本機械学会関西支部 第77期定時総会講演会講演予定.

    • Related Report
      2001 Annual Research Report

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Published: 2001-03-31   Modified: 2016-04-21  

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