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The Mechanism of Plastic Deformation in Quasicrystals

Research Project

Project/Area Number 10450236
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionScience University of Tokyo

Principal Investigator

TAKEUCHI Shin  Science University of Tokyo, Dept.Mater.Sci.& Tech., Professor, 基礎工学部, 教授 (60013512)

Co-Investigator(Kenkyū-buntansha) EDAGAWA Keiichi  University of Tokyo, Inst.Industrial Science, Assoc.Professor, 基礎工学部, 助教授 (20223654)
SUZUKI Takayoshi  University of Tokyo, Inst.Industrial Science, Professor, 生産技術研究所, 教授 (70013208)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1998: ¥5,400,000 (Direct Cost: ¥5,400,000)
KeywordsQuasicrystal / plastic deformation / dislocation / phason strain / Peierls mechanism / X線ラング法
Research Abstract

The purpose of the present research is to ellucidate the microscopic mechanism of plastic deformation of quasicrystals by analyzing the elementary process of dislocatin glide. We deformed single quasicrystals at high temperatures, and performed thermal-activation analysis of plastic deformation and electron microscopy observation. The main results for Al-(Cu, Ni)-Co decagonal quasicrystals are : 【encircled1】the yield strength depends sensitively on the quality of the sample : those of high quality samples are twice as high as those of low quality samples ; 【encircled2】the yield stress for slip in periodic direction is not much different from that in quasiperiodic direction, 【encircled3】dislocations introduced are straight. The main results for Al-Pd-Mn icosahedral quasicrystals are : 【encircled1】the dragging stresses for the dislocation glide due to phason defect production, which have been estimated from the stress-relaxation tests, are in the range of 20 to 50% of the flow stress, 【encircled2】true-stress vs true-strain analysis shows that after exhibiting maximum the true stress continuously decreases towards minimum at around the true strain of 0.5 and then changes to gradual hardening at higher strain, 【encircled3】activation analysis showed that the maximum flow stress and minimum flow stress are governed by different activation enthalpies. Based on these results, we propose the following microscopic deformation mechanism : 【encircled1】glide resistance to dislocation glide consists of athermal component due to phason strain production and thermal component due to Peierls potential, 【encircled2】due to the quasiperiodicity of the lattice the kink-pair formation enthalpy is not unique, 【encircled3】in the perfect quasilattice the dislocation glide velocity is governed by the large kink-pair formation enthalpy while in phason-defected quasilattice it is governed by small kink-pair formation enthalpy since kink migration is much easier than the kink-pair formation.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] K. Edagawa: "Platic Anisotropy in an Al-Cu-Co Decagonal Quasicrystal"Mater. Trans. JIM. 39.8. 863-865 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Takeuchi: "Disocation migration and phason strain relaxation in a guasicrystal"Philos. Mag. A. 79.2. 317-327 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Takeuchi: "Bulk Mechanical Properties of Quasicrystals"Mater. Res. Soc. Symp. Proc.. 553. 283-294 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Yoshida: "Plastic deformation and hardness in Mg-Zn-(Y, Ho)icosahedral guasicrystals"Mater. Sci. & Eng. A. 印刷中. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Edagawa: "Plasticity of Al-Ni-Co decagonal guasicrystals"Mater. Sci. & Eng. A. 印刷中. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Edagawa, Y.Arai, T.Hashimoto and S.Takeuchi: "Plastic Anisotropy in an Al-cu-Co Decagonal Quasicrystal"Mater.Trans.JIM. 39-8. 863-865

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Takeuchi, K.Shinoda and K.Edagawa: "Dislocation Migration and Phason Strain Relaxation in Quasicrystal"Philos.Mag.A. 79-2. 317-327 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Takeuchi: "Bulk Mechanical Properties of Quasicrystals"Mater.Res.Soc.Symp.Proc.. Vol.553. 283-294 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Yoshida, K.Itoh, R.Tamura and S.Takeuchi: "Plastic Deformation and Hardness in Mg-Zn-(Y, Ho) Icosahedral Quasicrystals"Mater.Sci.& Engr.A. (in the press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Edagawa, S.Takeuchi, E.Kabutoya, S.Ohta, J.Q.Guo and A.P.Tsai: "Plasticity of Al-Ni-Co Decagonal Single Quasicrystals"Mater.Sci.& Engr.A. (in the press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Takeuchi, K.Edagawa and R.Tamura: "Deformation Mechanism of Quasicrystals"Mater.Sci.& Engr.A. (to be published). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Edagawa: "Plastic Anisotropy in an Al-Cu-Co Decagonal Quasicrystak"Mater.Trans.J/M. 39・8. 863-865 (1988)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Takeuchi: "Dislocation migration and phason strain relaxation in a quasicrystal"Phil.Mag.A. 79・2. 317-327 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Takeuchi: "Bulk Mechanical Properties of Quasicrystals"Mater.Res.Soc.Symp.Proc.. 553. 283-294 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Yoshida: "Plastic deformation and hardness in Mg-Zn-(Y,Ho) icasahedral quasicrystals"Mater.Sci.& Eng.A. (発表予定). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Edagawa: "Plasticity of Al-Ni-Co decagonal single quasicrystaks"Mater.Sci.& Eng.A. (発表予定). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Takeuchi: "Deformation Mechanism of Quasicrystala"Mater.Sci. Eng.A. (発表予定). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Edagawa: "Plastic Anisotropy in an Al-Cu-Co Decagonal Quasicrystal" Mater.Trans.JIM. 39・8. 863-865 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Takeuchi: "Dislocation Migration and Phason Strain Relaxation in a Quasicrystal" Phil.Mag.A. 79・2. 317-327 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Takeuchi: "in“Quasicrystals"(MRS)" Bulk Mechanical Properties (in the press), (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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