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Characterization of the density fluctuations existing in amorphous alloys

Research Project

Project/Area Number 11450235
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionUniversity of Tsukuba

Principal Investigator

MIZUBAYASHI Hiroshi  Univ. of Tsukuba, Inst. Of Materials Sci., Prof., 物質工学系, 教授 (40114136)

Co-Investigator(Kenkyū-buntansha) TANIMOTO Hisanori  Univ. of Tsukuba, Inst. Of Materials Sci., Assist Prof., 物質工学系, 講師 (70222122)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥15,800,000 (Direct Cost: ¥15,800,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2000: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1999: ¥12,200,000 (Direct Cost: ¥12,200,000)
KeywordsAmorphous Alloy / Density fluctuation / Collective motion / Effect of electric current / Elastic modulus / Crystallization / Free energy / New materials / 構造緩和 / アクチュエータ
Research Abstract

For various amorphous alloys (a-alloys), we investigated the crystallization under electropulsing, the Young's modulus as a function of ε_t and f, E(ε_t, f), and an effect of electric current on E(ε_t, f), where ε_t is a strain amplitude and f is a frequency. The crystallization proceeds during electropulsing when I_<d0> is higher than the threshold I_<d0,c> and I_<d0,c> is a function of τ, where electropulsing was made by means of discharge of a condenser with the initial current density, I_<d0>, of the order of 10^9 A/m^2 and the decay time, τ, between 2 - 0.1 ms. The maximum increase in temperature during electropulsing is lower than the structural relaxation temperature, suggesting that thermal agitation is not responsible for the crystallization under electropulsing. Further, a new crystalline phase can be found after electropulsing. It is suggested that electropulsing excites a resonant collective motion of many atoms and modifies the thermodynamic free energy of phases too. E(10 … More ^<-6>,f) measured as a function of f commonly shows a decrease from E_0 in a frequency range of 10^1 Hz to 10^4 Hz, and local minimums near 10^2 Hz and between 10^3 and 10^4 Hz, where E_0 is the Young's modulus found in quasi-static tensile tests. E(ε_t, 10^2 Hz) increases with increasing ε_t and finally saturates at ε_t of 2 to 4 x lO^<-3>. We surmise that density fluctuations exist in amorphous alloys, where a high density region undergoes a resonant collective motion producing a resonant anelastic strain, and the high density regions show a distribution in dimension. An increase in E(10^<-6>,10^2 Hz ) due to an electric current is commonly observed for various a-alloys, suggesting that an electric current induces an internal stress due to an electromigration force concentration. We estimate the effective charge number, Z^* measuring the electromigration force concentration after a comparison between an increase in (10^<-6>,10^2 Hz ) due to an electric current and an increase in E(ε^t, 10^2 Hz) with increasing ε_t. A value of Z^* found is the order of 10^5 for various a-alloys, suggesting that the number of atoms associated with the collective motions excited at 10^2 Hz is between 10^3 and 10^4. The present work also suggests that a new materials can be found after electropulsing and the characteristic elastic properties may be applied to an electro mechanical device. Less

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (40 results)

All Other

All Publications (40 results)

  • [Publications] H.Mizubayashi, T, Hao, H.Tanimoto: "Low temperature crystallization of amorphous alloys under electropulsing"J. Non-Crystalline Solids. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Mizubayashi, T.Usui, H.Tanimoto: "Anomalous elastic properties of amorphous alloys suggesting a collective motion of many atoms"J. Non-Crystalline Solids. (in press). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Mizubayashi, S.Murayama, H.Tanimoto: "Feasibility of High-Strength and High-Damping Materials by means of Hydrogen Internal Friction in Amorphous Alloys"J. Alloys and Compounds. 330-332. 389-392 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Mizubayashi, N.Kameyama, T.Hao, H.Tanimoto: "Crystallization under electropulsing suggesting a resonant collective motion of many atoms and modification of thermodynamic parameters in amorphous alloys"Phys. Rev. B. 64. 054201-1-054201-10 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Mizubayashi, N.Kameyama: "Effects of Electropulsing on the Crystallization Process in Amorphous Pd_<80>Si_<20>"Proc. of Item. Conf. on Solid-Solid Phase Transformations '99 (JIMLC-3), Edited by M. Koiwa et al. (The Japan Institute of Metals, Sendai, 1999). 1235-1238 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Mizubayashi, T.Okamoto: "Low-Temperature Homogeneous Deformation in Amorphous Alloys Induced under Electropulsing"Materials Science Forum. 304-306. 355-360 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, T. Usui, H. Tanimoto: "Anomalous Elastic Response Amorphous Alloys Suggesting Collective Motions of Many Atoms"Materials Science and Engineering A. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, T. Hao, H. Tanimoto: "Low temperature crystallization of amorphous alloys under electropulsing"J. Non-Crystalline Solids. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, T. Usui, H. Tanimoto: "Anomalous elastic properties of amorphous alloys suggesting a collective motion of many atoms"J. Non-Crystalline Solids. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, S. Muravama, H. Tanimoto: "Feasibility of High-Strength and High-Damping Materials by means of Hydrogen Internal Friction in Amorphous Alloys"J. Alloys and Compounds. 330-332. 389-392 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, N. Kameyama, T. Hao, H. Tanimoto: "Crystallization under electropulsing suggesting a resonant collective motion of many atoms and modification of thermodynamic parameters in amorphous alloys"Phys. Rev.. B64. 054201-1-10 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, N. Kameyama: "Effects of Electropulsing on the Crystallization Process in Amorphous Pd_<80>Si_<20>"Proc. Of Intern. Conf. On Solid-Solid Phase Transformations '99 (JIMIC-3), Edited by M. Koiwa et al. (The Japan Institute of Metals, Sendai, 1999). 1235-1238

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi: "Anomalous Elastic Properties Found in Amorphous Alloys (in Japanese)"Kinzoku. 69. 105-109 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, T. Okamoto: "Low-Temperature Homogeneous Deformation in Amorphous Alloys Induced under Electropulsing"Materials Science Forum. 304-306. 355-360 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, M. Shibasaki, S. Murayama: "Local Strain Around Hydrogen in Amorphous Cu_<50>Zr_<50> and Cu_<50>Ti_<50>"Acta Mater. 47. 3331-3338 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Sakai, H. Tanimoto, K. Ltsuka, T. Yamada, Y. Koda, E. Kita, H. Mizubayashi: "Elastic Behaviors of High Density Nanocrystalline Gold Prepared by Gas Deposition Method"Scripta mater. 45. 1313-1319 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tanimoto, Y. Koda, S. Sakai, H. Mizubayashi, E. Kita: "Nanostructure and Thermal Stability ofAu Film Prepared by Spattering Technique"Scripta mater. 44. 2231-2235 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Sakai, H. Tanimoto, H. Mizubayashi: "Mechanical Behavior of High Density Nanociystalline Gold Prepared by Gas Deposition Method"Acta Mater. 47. 211-218 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, J. Matsuno, H. Tanimoto: "Young's Modulus of Silver Films"Scripta Mater. 41. 443-448 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, S. Iwasaki, T. Yamaguchi, Y. Yoshihara, W. Soe, R.Yamamoto: "High Thermal Stability Associated with Supermodulus Effect Found in Ag/Pd Multilayer Films"J. Magnetism and Magnetic Materials. 198/199. 605-607 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, SJ. Li, H. Yumoto, M. Shimotomai: "The Young's Modulus of Single Phase Cementite"Scripta Mater. 40. 773-777 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Tanimoto, S. Sakai, H. Mizubayashi: "Anomalous Mechanical Behavior of High-density Nanocrystalline Gold"Tran. Mater. Research Soc. Japan. 24. 117-120 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Mizubayashi, T. Usui, H. Tanimoto: "Anomalous elastic properties of amorphous alloys suggesting a collective motion of many atoms"J. Non-Crystalline Solids. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] H. Mizubayashi, N. Kameyama, T. Hao, H. Tanimoto: "Crystallization under electropulsing suggesting a resonant collective motion of many atoms and modification of thermodynamic parameters in amorphous alloys"Physical Review B. 64. 054201-1 to 10 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H. Tanimoto, Y. Koda, S. Sakai, H. Mizubayashi, E. Kita: "Nanostructure and Thermal Stability of Au Film Prepared by Spattering Technique"Scripta Materialia. 44. 2231-2235 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H. Tanimoto, Y. Koda, S. Sakai, E. Kita, H. Mizubayashi: "Thermal Stability of Nanocrystalline FCC Metals"Proc. of the 22^<nd> Riso International Symposium on Materials Science: Ed. A.R. Dinesen et al., Riso National Laboratory, Roskilde, Denmark 2001. 401-406 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S. Sakai, H. Tanimoto, K. Otsuka, T. Yamada, Y. Koda, E. Kita, H. Mizubayashi: "Elastic Behaviors of High Density Nanocrystalline Gold Prepared by Gas Deposition Method"Scripta Materialia. 45. 1313-1319 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H. Mizubayashi, S. Murayama, H. Tanimoto: "Feasibility of High-Strength and High-Damping Materials by means of Hydrogen Internal Friction in Amorphous Alloys"J. Alloys and Compounds. 330-332. 389-392 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Tanimoto,L.Pasqunrni,R.Prummer,H.Kromuller,and H.-E.Schaefer: "Diffusion of Explosive Compacted n-Fe"Scripta Materialia. 42. 961-966 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.-E.Schaefer,K.Reimann,W.Straub,F.Phillipp,H.Tanimoto,R.Brossmann and R.Wurschum: "Interface Structure Studies by Atomic Resolution Electron Microscopy, Order-Disorder Phenomena and Atomic Diffusion in Gas-Phase Synthesized Nanocrystalline Solids"Materials Science and Engineering. A286. 24-33 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Mizubayashi,G.Nishikori and H.Tanimoto,: "High-Cycle Fatigue Properties of 316 SS under Thermal-Pulses"Materials Transaction. 42. 151-156 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Mizubayashi,S.Murayana and H.Tanimoto: "Feasibility of High-Strength and High-Damping Materials by means of Hydrogen Internal Friction in Amorphous Alloys"J.Alloys and Compounds. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Tanimoto,Y.Koda,S.Sakai,H.Mizubayashi and E.Kita: "Nanostructure and Thermal Stability of Au Film Prepared by Spattering Technique"Scripta Materiaria. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Tanimoto,S.Sakai,K.Otsuka,E.Kita and H.Mizubayashi: "Grain Boundary State and Elastic Property of High-Density Nanocrystalline Gold Prepared by Gas-Deposition Method"Physical Review B. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Mizubayashi, M.Shibasaki and S.Murayama: "Local Strain Around Hydrogen in Amorphous Cu_<50>Zr_<50> and Cu_<50>Ti_<50>"Acta Materialia. 47. 3331-3338 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Mizubayashi and N.Kameyama: "Effects of Electropulsing on the Crystallization Process in Amorphous Pd_<80>Si_<20>"proc. Of the Intern. Conf. On Solid-Solid Phase Transformations '99 (JIMIC-3), Ed.by M.Koiwa et al, (The Japan Institute of Metals, Sendai). 1235-1238 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Mizubayashi and T.Okamoto: "Low-Temperature Homogeneous Deformation in Amorphous Alloys Induced under Electropulsing"Materials Science Forum. 304-306. 355-360 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Sakai, H.Tanimoto and H.Mizubayashi: "Mechanical Behavior of High Density Nanocrystalline Gold Prepared by Gas Deposition Method"Acta Materials. 12. 751-756 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Tanimoto. S.Sakai and H.Mizubayashi: "Mechanical Property of High Density Nanocrystalline Gold Prepared by Gas Deposition Method"Nano Structured Materials. 40. 117-120 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Yanimoto, S.Sakai and H.Mizutani: "Anomalous Mechanical Behaivior of High-density Nanocrystalline Gold"Tran. Mater. Research Soc. Japan.

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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