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High pressure and shock induced amorphization in boron carbide

Research Project

Project/Area Number 16206064
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionTohoku University

Principal Investigator

CHEN Mingwei  Tohoku University, Institute for Materials Research, Professor, 金属材料研究所, 教授 (20372310)

Co-Investigator(Kenkyū-buntansha) NAGAO Tadaaki  National Institute for Materials Science, Nano materials center, Chief researcher, ナノマテリアル研究所, 主任研究員 (40267456)
GOTO Takashi  Tohoku University, Institution for Materials Research, Professor, 金属材料研究所, 教授 (60125549)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥51,350,000 (Direct Cost: ¥39,500,000、Indirect Cost: ¥11,850,000)
Fiscal Year 2005: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
Fiscal Year 2004: ¥40,560,000 (Direct Cost: ¥31,200,000、Indirect Cost: ¥9,360,000)
KeywordsBoron carbide / B4C / shock / Destruction / Ceramics / Electron microscope / Raman spectroscopy / マイクロラマン / 衝撃や圧力によって誘起される非晶質化 / 超高硬度材料 / ナノ・インデンテーション / 高分解電子顕微鏡(HREM) / 電子エネルギー損失分光(EELS)
Research Abstract

By combining Raman microscopy, nanoindentaion and high-pressure diamond anvil cell, the pressure-induced amorphization in single-crystal B_4C have been systemically investigated. The localized amorphization was found to start with the applied pressure at about 25GPa and extensive amorphization was observed with the applied pressure up to 50GPa. Interestingly, the amorphization only occurs during unloading. Phase transitions have not been seen during loading or still at high pressures. Low- and high-temperature Raman spectroscopy study reveals that amorphous B_4C is composed of carbon aromatic rings and B11C icosahedra. The amorphization of B_4C is associated with the destruction of the C-B-C chains and the formation of sp2 carbon clusters. This disordered structure with relatively weak carbon sp2 bonds is believed to be responsible for the loss of B_4C shear strength at high pressures. The possible polytypes of the chain structure in B_4C was investigated by ab initio calculations. The … More B-C-B chain structure was found to have the lowest energy than other polytypes. The structure was experimentally confirmed by Cs-corrected high-resolution scanning transmission electron microscopy that owns the point-to-point resolution better than 1.0 angstrom. In addition to the quasi-static study, amorphization of B_4C was also observed in the shock-loaded fragments and scratched debris. A large amount of amorphous phase mixed with nanocrystalline particles was characterized in the shock fragments with the impact pressure of about 40GPa. The compositions of the both amorphous and nanocrystalline phases are the same as the crystalline boron carbide, suggesting a polymorphic transition occurs during shocking loading. The observations of amorphization of B_4C under both quasi-static and dynamic loading indicate that the high pressures play the dominant role in the elastic instability of B_4C and irreversible high elastic deformation caused by high pressures is responsible for the amorphization during unloading. Less

Report

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

    (14 results)

All 2006 2005 Other

All Journal Article (14 results)

  • [Journal Article] Raman spectroscopy of pressure-induced amorphous boron carbide2006

    • Author(s)
      X.Q.Yan, W.J.Li, T.Goto, M.W.Chen
    • Journal Title

      APPLIED PHYSICS LETTERS 88

      Pages: 131905-131905

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Strengthening and softening of nanocrystalline Ni during multi-step nanoindentation2006

    • Author(s)
      D.Pan, T.G.Nieh, M.W.Chen
    • Journal Title

      APPLIED PHYSICS LETTERS 88

      Pages: 161922-161922

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Raman spectroscopy of pressure-induced amorphous boron carbide2006

    • Author(s)
      Yan XQ, Li WJ, Goto T, Chen MW
    • Journal Title

      APPLIED PHYSICS LETTERS (In press)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Microstructural characterization of commercial hot-pressed boron carbide ceramics2005

    • Author(s)
      M.W.Chen, J.W.McCauley, K.J.Hemker
    • Journal Title

      JOURNAL OF THE AMERICAN CERAMIC SOCIETY 88

      Pages: 1935-1942

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of heavy boron doping on pressure-induced phase transitions in single-crystal silicon2005

    • Author(s)
      Yan XQ, Huang XM, Uda S, Chen MW
    • Journal Title

      APPLIED PHYSICS LETTERS 87

      Pages: 191911-191911

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Comment on "Grain boundary mediated plasticity in nanocrystalline nickel"2005

    • Author(s)
      M.W.Chen, X.Q.Yan
    • Journal Title

      Science 308

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Reaction at the interface between Si melt and a Ba-doped silica crucible2005

    • Author(s)
      X.M.Huang, S.J.Koh, K.H.Wu, M.W.Chen, T.Hoshikawa, K.Hoshikawa, S.Uda
    • Journal Title

      Journal of Crystal Growth 277

      Pages: 154-161

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Redistributions of alloying elements in quasicrystallized Zr-Al-Ni-Cu-Ag bulk metallic glass2005

    • Author(s)
      M.W.Chen, A.Inoue, T.Sakurai, E.S.K.Menon, R.Nagarajan, I.Dutta
    • Journal Title

      Physical Review B 71

      Pages: 92202-92202

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Microstructural characterization of commercial hot-pressed boron carbide ceramics2005

    • Author(s)
      Chen MW, McCauley JW, LaSalvla JC, Hemker KJ
    • Journal Title

      JOURNAL OF THE AMERICAN CERAMIC SOCIETY 88

      Pages: 1935-1942

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Origin of extraordinary plasticity of ductile bulk metallic glasses

    • Author(s)
      M.W.Chen, A.Inoue, W.Zhang, T.Sakurai
    • Journal Title

      Physical Review Letters (In press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Origin of extraordinary plasticity of ductile bulk metallic glasses

    • Author(s)
      M.W.Chen, A.Inoue, W.Zhang, T.Sakurai
    • Journal Title

      Physical Review Letters (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] Comment on "Grain boundary mediated plasticity in nanocrystalline nickel"

    • Author(s)
      M.W.Chen, X.Q.Yan
    • Journal Title

      Science (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Redistributions of alloying elements in quasicrystallized Zr-Al-Ni-Cu-Ag bulk metallic glass

    • Author(s)
      M.W.Chen, A.Inoue, T.Sakurai, E.S.K.Menon, R.Nagarajan, I.Dutta
    • Journal Title

      Phys.Rev.B (印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Microstructural characterization of commercial hot-pressed boron carbide ceramics

    • Author(s)
      M.W.Chen, W.McCauley, K.J.Hemker
    • Journal Title

      J.Amer.Ceram.Soc. (印刷中)

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2021-04-07  

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