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1999 Fiscal Year Final Research Report Summary

On Corrosion and Stress Corrosion Cracking Behavior of Nanocrystals

Research Project

Project/Area Number 09650771
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MIMAKI Takuro  Doshisha University, Department of Mechanical Engineering, Professor, 工学部, 教授 (20066244)

Co-Investigator(Kenkyū-buntansha) HASHIMOTO Satoshi  Osaka City University, Department of Intelligent Materials Engineering, Professor, 工学部, 教授 (50127122)
Project Period (FY) 1997 – 1999
KeywordsCopper / Corrosion / Stress Corrosion Cracking / Ultra-Fine Grain / Equi-Channel Angular Extrusion / Grain Boundary / Dislocation Density / Corrosion Potential
Research Abstract

Corrosion tests under a constant potential, stress corrosion cracking (SCC) tests were performed on the ultra fine grained (UFG) copper (avarage grain size : 200 nm) manufactured by Equi-Channel Angular Extrusion (ECAE) technique and on conventional copper specimens. The surface of the UFG copper showed a typical general corrosion. However, the UFG copper has a very high corrosion resistance compared with the conventinal copper (average grain size : 20μ). By Severe Plastic Deformation (SPD), all lattice dislocations flowed out to the grain boundary, so the extremely high dislocation density was formed at the grain boundary of UFG copper. The corrosion potential at the grain boundary of UFG copper was increased by the high dislocation density. On the otherhand, a very strong strain field was induced in the grain interior, so the corrosion potential became high, too. Disolution is controlled by the difference of potential between grain boundary and grain interior.
The susseptibility to stress corrosion cracking of UFG copper was very low compared with conventinal copper and annealed UFG(the same grain size). The gain boundary slidings (GBS) were observed during the tests at room temperature. This GBS acts as a stress relieving sites on the SCC behavior of the UFG copper.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] A. Vinogradov et al.: "On the corrosion behavior of ultra-fine grain copper"Scripta Materialia. Vol.41. 319-326 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A. Vinogradov et al.: "On Corrosion of Ultra-Fine Grained Copper Produced by Equi-Channel Angular Pressing"Materials Science Forum. Vol.312-314. 641-646 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mimaki et al.: "Propagation Behavior of Intergranular Stress-Corrosion Cracking of Cu-9at.% Al Bicrystals Shaped to the Tapered Double Cantilever Beam Specimen"Materials Science Forum. Vols.294-296. 169-172 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Yamashita et al.: "Measurement of Grain Boundary Corrosion on Copper [110]-Tilt Bicrystals by Scanning Vibrating Electrode Technique"Materials Science Forum. Vols.294-296. 739-742 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kaneko et al.: "Cyclic Stress-Strain Response of Ferritic Stainless Steel Single Crystals with the (112) Primary Slip Plane"Acta Materialia. Vol.47. 165-173 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Miyamoto et al.: "Change in the Relation Between Current and Strain During Cyclic Deformation of Cu Single Clystals in NaNO2 Solution"Fatigue '99. Vol. 4/4. 2249-2252 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Yamasaki et al.: "Cyclic Stress-Strain Response of Ferritic Stainless Steel Single Crystals Oriented for Single Slip and Mutiple Slip"Fatigue '99. Vol. 1/4. 181-186 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Miyamoto et al.: "Sliding Mechanism of FCC/BCC Interphase Boundaries"Materials Science Forum. Vols.294-296. 637-640 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kaneko et al.: "Cyclic Response and Burst Phenomena in Cyclically Deformed Single Crystals of a Ferritic Stainless Steel"Materials Science and Engineering. Vol.A245. 233-241 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Vinogradov, T.Mimaki, S.Hashimoto and R,.Valiev: "On the Corrosion Behavior of Ultra-Fine Grain Copper"Scrita Materialia. Vol. 41,No.3. 319-326 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Vinogradov, T.Mimaki, S.Hashimoto and R.Valiev: "On Corrosion of Ultra-Fine Grained Copper Produced by Equi-Channel Angular Pressing"Materials Science Forum. vols.312-314. 641-646 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Mimaki, H.Ando, H.Miyamoto, Y.Kaneko and S.Hashimoto: "Propagation Behavior of Intergranular Stress-Corrosion Cracking of Cu-9at.% Al Bicrystals Shaped to the Tapered Double Cantilever Beam Specimen"Materials Science Forum. sols.2943296. 169-172 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamashita, H.Miyamoto, J.Yahashi, H.Uchida S.Hashimoto and T.Mimaki: "Measurement of Grain Boundary Corrosion Current on Copper [110]-Tilt Bicrystals by scanning Vibrating Electrode Technique"Materials Science Forum. vols.294-296. 739-742 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kaneko, T.Mimaki and S.Hashimoto: "Cyclic Stress-Strain Response of Ferritic Stainless Steel Single Crystals with the (112) Primary Slip Plane"Acta Materialia. vol. 47No.1. 165-173 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Miyamoto, I.Tsuji, T.Mimaki and S.Hashimoto: "Change in the Relation between Current and Strain during Cyclic Deformation of Cu Single Crystals in a NaNOィイD22ィエD2 Solution"Fatigue '99. vol.4/4. 2249-2252 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Yamasaki, Y.Kaneko,H.Miyamoto, T.Mimaki and S.Hashimoto: "Cyclic Stress-Strain Response of Ferritic Stainless Steel Single Crystals Oriented for Single Slip and Multiple Slip"Fatigue '99. vol.1/4. 181-186 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Miyamoto, T.Mimaki and S.Hashimoto: "Sliding Mechanism of FCC/BCC Interphase Boundaries"Materials Science Forum. vols. 294-296. 637-640 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y,Kaneko, T.Mimaki and S.Hashimoto: "Cyclic Response and Burst Phenomena in Cyclically Deformed Single Crystals of a Ferritic Stainless Steel"Materials Science and Engineering. vol.A245. 233-241 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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