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Study on Fatigue Failure of Alloyed Cu Bicrystals by means of in-situ SEM Observation

Research Project

Project/Area Number 08455320
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionKANAZAWA UNIVERSITY

Principal Investigator

KITAGAWA Kazuo  Kanazawa University, Faculty of Engineering, Professor, 工学部, 教授 (30019757)

Co-Investigator(Kenkyū-buntansha) KITA Kazuhisa  Kanazawa University, Faculty of Engineering, Assistant, 工学部, 助手 (10195240)
KANEKO Yoshihisa  Kanazawa University, Faculty of Engineering, Assistant, 工学部, 助手 (40283098)
VINOGRADOV A.  Kanazawa University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10283102)
MONZEN Ryoichi  Kanazawa University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20166466)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥6,500,000 (Direct Cost: ¥6,500,000)
Keywordsfatigue crack / grain boundary structure / bicrystal / twin boundary / molecular dynamics / tilt boundary / grain boundary energy / 銅合金 / Σ3(111)双晶境界
Research Abstract

It has widely been accepted that a structure of grain boundary (GB) is one of the decisive factors affecting the GB-related phenomena such as the GB sliding, the GB corrosion and the GB stress-corrosion cracking, which are important for engineering purposes. In addition to these phenomena, fatigue behavior of materials is expected to be sensitive to the structure of the GB contained. In order to correlate the fatigue property with the GB structure, both fatigue experiments and simulations of the GB structures were carried out on the copper model bicrystals.
1. The results of the fatigue investigation on copper bicrystal having a longitudinal twist boundary are summarized as follows.
(1) The incompatibility of plastic strain at the GBs could induce high internal stresses in the vicinity of GBs, and apparently assists the nucleation of an intergranular fatigue crack.
(2) The GB affected zone was a strong barrier against the propagation of the intragranular crack that was initiated at a free … More surface.
2. In the experiments on the deviation angle dependence of the GB cracking using the copper bicrystals having the orientation relationship close to SIGMA3 (111), the following conclusions were obtained.
(1) In the speciments having the deviation angles less than 3゚, no any intergranular crack propagations were observed. On the other hand, the fatigue cracks often propagated along the GBs when the deviation angle increased up to 5゚. Hence, it is can be said that the intergranular fatigue cracking in the copper is sensitive to the GB structure.
(2) The slip step dissolution model can be applicable also for the propagation of the intergranular fatigue cracks.
(3) Paths of the fatigue cracks were determined not only by the GB structure but also by the slip geometry of the constituent grains.
3. The results of the molecular dynamics simulation focused on the GB structure of [110] tilt boundaries can be summarized as follows.
(1) Arangements of lattice dislocations within low-angle GBs agreed well with those predicted from the differing at Burgers vector.
(2) The estimated GB energy showed strong dependence on the misorientation angle between the grains. The GB energies of the low-angle boundaries were in good agreement with the theoretical values calculated from the Read-Shockley model. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] KITAGAWA Kazuo: "Effect of Plastic Strain Incompatibility on the Cracking of Twist Grain Boundaries in Copper Bicrystals" Proc.of 8th Japan Institute ofMetals International Symposium (JIMIS-8). 507-510 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] MONZEN Ryoichi: "Effect of Element Segregation on Nanometer Grain Boundary Sliding inCopper" Materials Science Forum. 207-209. 165-168 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] VINOGRADOV Alexei: "Effect of Grain Boundary on Acoustic Emission During Plastic Deformation of Copper-Aluminum Bicrystals" Acta Metallurgica and Materialia. 44. 2883-2890 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 兼子 佳久: "Fe-30mass%Cr合金のΣ3(112)双晶粒界におけるき裂伝播とすべりの連続性との関係" 日本金属学会誌. 60. 345-346 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] KITAGAWA Kazuo: "Plastic Deformation of Copper Single Crystals under Cyclic Loading" Materials Science and Engineering A. 234-236. 591-593 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] KITAGAWA Kazuo: "Effect of Crystallographic Orientation and Grain Boundary on Acoustic Emission in Aluminum Single-and Bi-crystals" Materials Tranactions,JIM. 38. 607-614 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] VINOGRADOV Alexei: "Effect of Triple Junction on Fatigue Crack Growth in Copper and Copper-3at.% Aluminum Tricrystals" Scripta Materialia. 36. 417-423 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] HASHIMOTO Satoshi: "Grain Boundary Cracking in Fatigued Bicrystals" Interface Science. 4. 347-355 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kitagawa: "Effect of Plastic Strain Incompatibility on the cracking of Twist Grain Boundaries in Copper Bicrystals" Proc.of 8th Japan Institute of Metals International Symposium (JIMIS-8). 507 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] R.Monzen: "Effects of Element Segragation on Nanometer Grain Boundary Sliding in Copper" Materials Science Forum. 165. 207-209 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.Vinogradov: "Effect of Grain Boundary on Acoustic Emission During Plastic Deformation of Copper-Aluminum Bicrystals" Acta Metallurgica and Materialia. 44. 2883 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Kaneko: "Relationship between Crack Propagation and Slip Continuity at the SIGMA3 (112) Twin Boundary in Fe-30 mass% Cr Alloy" J.Japan Inst.Metals. 60. 345 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kitagawa: "Plastic Deformation of Copper Single Crystals under Cyclic Loading" Materials Science and Engineering A. 591. 234-236 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Kitagawa: "Effect of Crystallographic Orientation and Grain Boundary on Acoustic Emission in Alminum Single-and Bi-crystals" Materials Transactions, JIM. 38. 607 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] A.Vinogradov: "Effect of Triple Junction on Fatigue Crack Growth in Copper and Copper-3at.% Aluminum Tricrystals" Scripta Materialia. 36. 417 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Hashimoto: "Grain Boundary Cracking in Fatigued Bicrystals" Interface Science. 4. 347 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kitagawa Kazuo: "Plastic Deformation of Copper Single Crystals under Cyclic Loading" Materials Sci ence and Engineering A. 234-236. 591-593 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kitagawa Kazuo: "Effect of Crystal ograp hic Orientation and Grain Boundary on Acoustic Emission in Aluminum Single-and Bi-crystals" Materials Transactions,JIM. 38・7. 607-614 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Vinogradov Alexei: "Effect of Triple Junction on Fatigue Crack Growth in Copper and Copper-3at.% Aluminum Tricrystals" Scripta Materialia. 36・4. 417-423 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hashimoto Satoshi: "Grain Boundary Cracking in Fatigued Bicrystals" Interface Science. 4. 347-355 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Kitagawa: "Effect of Plastic Incompatibility on the cracking of Twist Grain Boundaries in Copper Bicrystals" Proc.of 8th Japan Institute of Metals International Symposium(JIMIS-8). 507-510 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] R.Monzen: "Effect of Element Segregation on Nanometer Grain Boundary Sliding in Copper" Materials Science Forum. 207-209. 165-168 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] A.Y.Vinogradov: "Effect of Grain Boundary on Acoustic Emission During Plastic Deformation of Copper-Aluminum Bicrystals" Act a Met allurigica and Materialia. 44・7. 2883-2890 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 兼子佳久: "Fe-30mas s%Cr合金のΣ3(112)双晶粒界におけるき裂伝播とすべりの連続性との関係" 日本金属学会誌. 60・3. 345-346 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2021-04-07  

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