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Damping capacity and its mechanisms of ultrafine-grained structural materials produced by ARB process.

Research Project

Project/Area Number 15360366
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionOsaka University

Principal Investigator

MINAMINO Yoritoshi  Osaka University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (30116107)

Co-Investigator(Kenkyū-buntansha) TSUJI Nobuhiro  Osaka University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (30263213)
KOIZUMI Yuichiro  Osaka University, Graduate School of Engineering, Assistant Professor, 工学研究科, 助手 (10322174)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥13,500,000 (Direct Cost: ¥13,500,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥11,900,000 (Direct Cost: ¥11,900,000)
KeywordsARB / internal friction / severe plastic deformation / dislocation / ultrafine grain / strength / annealing / recrystallization / 制振特性 / 磁壁 / 強加工材 / 圧延 / 防振特性 / IF鋼 / 1100合金
Research Abstract

This research was made in 2003 to 2005 to investigate the damping properties of structural metals with ultrafine grains fabricated by Accumulative Roll-Bonding (ARB) process and to clarify their damping mechanisms. The materials of pure aluminum (1100 Al), Ni, low carbon IF steel with Ti element and Fe-Cr-Al alloys were severely deformed by up to an equivalent strain (e) of 4.8 by the ARB process to have the ultrafine grain structures to about 0.1um in diameter. The severely deformed materials were annealed at various temperatures for 30min to change the structures of metals. They were observed by transmission electron microscopy, magnetic measurement, tensile test, microVickers measurement and internal friction measurement.
Internal friction (Q^1) of Al and Ni increased with increasing amount of deformation. The deformed materials of e=3.2 had the quite high Q^1 of 6.6×10^<-3> and it kept about constant against the deformation. These internal frictions were explained as follows. The di … More stance of the dislocation motion under vibration stress seemed to be small due to the smallness of the grain size. The change in the Q^1 with number of the ARB cycles was attributed to the changes in the dislocation density and the distance of dislocation motion under vibrating stress which is controlled by the pinning points and the grain boundaries. As for the internal friction of IF steel, the Q^1 was 1.4×10^<-3> for IF steel with grains of 22um in diameter, 1.6×10^<-3> for that of 0.4um and 1.8×10^<-3> for that of 0.2um ; that is, the internal friction increased with decreasing diameter of grains. On the other hand, the strengths were 270MPa for the IF steel with grains of 22um in diameter and 900MPa for 0.2um ; that is, the strength increased by 3 times with decreasing diameter of grains. The internal friction were decreased to 1.57×10^<-3> by the annealing at 873K, but it recovered to be 1.72×10^<-3> by the annealing at 973K. Thus, the strength of IF steel with ultrafine grains becomes by three times higher than that of the ordinary IF steel and its damping property is improved to increase by 30% when compared with the ordinary IF steel. Because this damping for the IF steel occurs due to the dislocation damping mechanism, the control in the amounts of dislocation density, mobility and wipe area can increase the strength and damping ability of IF steel. As for the Fe-Cr-Al alloys, the strength of Fe-Cr-Al alloys increased to twice of the strength of the ordinary Fe-Cr-Al alloy due to the ultrafine grains structure of about 0.11um in diameter, while its internal friction was lowered to half. However, after the annealing near 773K, the internal friction increased largely although the strength retains constant or little decreased. This reason is that the strength is lowered little due to small change in grain size, and the internal friction is increased by the increment in the magnetic wall shift. Thus, it was found from this research project, grant- in-aid for scientific research that the high performance damping materials can be produced by the combination of severe plastic deformation and annealing. Less

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (6 results)

All 2005 2003 Other

All Journal Article (5 results) Publications (1 results)

  • [Journal Article] 繰り返し重ね接合圧延(ARB)により結晶粒超微細化されたニッケルの内部摩擦2005

    • Author(s)
      小泉 雄一郎, 植山 将宜, 辻 伸泰, 南埜 宜俊, 太田 健一
    • Journal Title

      日本金属学会誌 69

      Pages: 997-1003

    • NAID

      10016869554

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Internal Friction of Ultrafine-Grained Nickel Produced by Accumulative Roll-Bonding (ARB)2005

    • Author(s)
      Yuichiro Koizumi, Masanori Ueyama, Nobuhiro Tsuji, Yoritoshi Minamino, Ken'ichi Ota
    • Journal Title

      Journal of the Japan Institute of Metals 69, 11

      Pages: 997-1003

    • NAID

      10016869554

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 繰り返し重ね接合圧延(ARB)により結晶粒超微細化されたニッケルの内部摩擦2005

    • Author(s)
      小泉 雄一郎, 植山 将宜, 辻 伸泰, 南埜 宜俊, 太田健一
    • Journal Title

      日本金属学会誌 69

      Pages: 997-1003

    • NAID

      10016869554

    • Related Report
      2005 Annual Research Report
  • [Journal Article] High-Damping Capacity of Ultra-Fine Grained Aluminium Produced by Accumulative Roll-Bonding (ARB),2003

    • Author(s)
      Y.Koizumi, M.Ueyama, N.Tsuji, Y.Minamino, K.Ota
    • Journal Title

      Journal of Alloys and Compounds 355

      Pages: 47-51

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] High-Damping Capacity of Ultra-Fine Grained Aluminium Produced by Accumulative Roll-Bonding (ARB)2003

    • Author(s)
      Y.Koizumi, M.Ueyama, N.Tsuji, Y.Minamino, K.Ota
    • Journal Title

      Journal of Alloys and Compounds 355

      Pages: 47-51

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] Y.Koizumi, M.Ueyama, N.Tsuji, Y.Minamino, K.I.Ota: "High Damping Capacity of Ultra-Fine Grained Aluminum Produced by Accumulative Roll Bonding"J.Alloys and Compounds. 355. 47-51 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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