Improvement of fatigue resistance in high conductivity copper alloysby microstructural control

2012 Fiscal Year Final Research Report

• Project/Area Number: 22560690
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: FUJII Toshiyuki 東京工業大学, 理工学研究科, 教授 (40251665)
• Co-Investigator(Kenkyū-buntansha): ONAKA Susumu 東京工業大学, 大学院・総合理工学研究科, 教授 (40194576) ; KATO Masaharu 東京工業大学, 大学院・総合理工学研究科, 教授 (50161120)
• Project Period (FY): 2010 – 2012
• Keywords: 疲労 / 繰り返し変形 / 析出強化型合金 / 銅合金 / 導電性材料 / 析出粒子 / 不均一 変形

Research Abstract

To reveal cyclic softening behavior in high conductivity copper alloys, plastic strain amplitude controlled fatigue tests were conducted. The macroscopic cyclic softening can be attributed to the local deformation induced by the shear and re-dissolution of the precipitate particles in the persistent slip bands. We concluded that the dispersion of non-shearable particles is a key factor to improve fatigue resistance of the copper alloys.

Research Products

• [Journal Article] Low-Temperature Fatigue Behaviour and Development of Dislocation Structure in Aluminium Single Crystals with Single-Slip Orientation; (2013)
  • Author(s): Y.Nakanishi,H.Tanaka,T.Fujii,S. Onaka and M.Kato
  • Journal Title: Philosophical Magazine Volume: (掲載決定)
  • DOI: DOI:10.1080/14786435.2013.786193
  • Peer Reviewed
• [Journal Article] Stability of Fatigued Dislocation Wall Structure in Coarse-Grained and Ultrafine-Grained Aluminum against Monotonic Tensile Deformation (2013)
  • Author(s): Y.Nakanishi,Y.Miyajima,T.Fujii,S.Onaka and M. Kato
  • Journal Title: Materials Transactions Volume: 54[1] Pages: 43-49
  • DOI: DOI:10.2320/matertrans.M2012280
  • Peer Reviewed
• [Journal Article] Morphological and Crystallographic Characteristics of Incoherent Octahedral FCC Co Precipitates in a Cu Matrix; (2012)
  • Author(s): T.Miyazawa,Y.Ozawa,Y.Miyajima,T.Fujii,S.Onaka and M.Kato
  • Journal Title: Materials Transactions Volume: 53[5] Pages: 893-901
  • DOI: DOI:10.2320/matertrans.M2011335
  • Peer Reviewed
• [Journal Article] Low-Cycle Fatigue of Ultrafine-Grained Aluminum at Low Temperatures (2011)
  • Author(s): Y. Nakanishi, T. Fujii, S. Onaka and M. Kato
  • Journal Title: Materials Transactions Volume: 52[5] Pages: 890-894
  • DOI: DOI:10.2320/matertrans.L-MZ201103
  • Peer Reviewed
• [Journal Article] Shape and Elastic State of Nano-Sized AgPrecipitates in a Cu-Ag Single Crystal (2011)
  • Author(s): T. Miyazawa, T. Fujii, S. Onaka and M. Kato
  • Journal Title: Journal of Materials Science Volume: 46[12] Pages: 4228-4235
  • Peer Reviewed
• [Journal Article] 加藤雅治:CuおよびAlの繰り返し変形による 転位組織形成 (2010)
  • Author(s): 藤居俊之,田中寛之,渡邊千尋, 尾中晋
  • Journal Title: まてりあ Volume: 49[6] Pages: 258
• [Journal Article] Cyclic Softening of Cu-Ni-Si Alloy Single Crystals under Low-Cycle Fatigue
  • Author(s): T. Fujii, H. Kamio, Y. Sugisawa, S. Onaka and M. Kato
  • Journal Title: Materials Science Forum Volume: 2010 Pages: 1287-1290
  • DOI: DOI:10.4028/www.scientific.net/MSF.654-656.1287
  • Peer Reviewed
• [Presentation] Co-Fe粒子を分散させた超微細粒Cu合金の熱的安定性 (2013)
  • Author(s): 藤居俊之,宮本翔,宮嶋陽司,尾中晋,加藤雅治
  • Organizer: 産学新日鐵住金シンポジウム(招待講演)
  • Place of Presentation: 新日鐵住金富津研究所(千葉県)
  • Year and Date: 2013-03-08
• [Presentation] BCCCo-Fe粒子が分散したCu合金における超微細粒組織の熱的安定性 (2012)
  • Author(s): 宮本翔,宮嶋陽司,藤居俊之,尾中晋,加藤雅治
  • Organizer: 日本金属学会秋期講演大会
  • Place of Presentation: 愛媛大学(愛媛県)
  • Year and Date: 2012-09-17
• [Presentation] Cu母相内での板状Co-Fe粒子の幾何学的配列 (2012)
  • Author(s): 藤居俊之
  • Organizer: 銅及び銅合金研究強化・産学連携事業
  • Place of Presentation: メルパルク東京(東京都)
  • Year and Date: 2012-08-07
• [Presentation] 析出強化型Cu-Ni-Si合金単結晶の繰り返し変形に伴う軟化 (2011)
  • Author(s): 藤居俊之,神尾浩史,尾中晋,加藤雅治
  • Organizer: 第51回銅及び銅合金技術研究会講演大会
  • Place of Presentation: 京都テルサ(京都府)
  • Year and Date: 2011-11-14
• [Presentation] Magnetic-Field-Induced Shape Evolution of Ferromagnetic Co-Fe Particles in a Cu Matrix; (2011)
  • Author(s): T. Fujii
  • Organizer: International Conference on Processing and Manufacturing of Advanced Materials (THERMEC'2011)
  • Place of Presentation: Quebec,Canada,(2011)
  • Year and Date: 2011-08-02
• [Presentation] Suppression of Grain Growth by Precipitation of Co-Fe Particles during Aging of an ECAPed Cu Alloy; (2010)
  • Author(s): T. Sumiya, T. Fujii, H. Sato, Y. Watanabe, S. Onaka and M. Kato
  • Organizer: International Symposium on Giant Straining Process for Advanced Materials (GSAM2010)
  • Place of Presentation: Fukuoka,Japan
  • Year and Date: 20101100
• [Presentation] Ni_2Si析出粒子を含むCu合金単結晶の繰り返し変形挙動 (2010)
  • Author(s): 藤居俊之,神尾浩史,尾中晋,加藤雅治
  • Organizer: 日本金属学会秋期講演大会
  • Place of Presentation: 北海道大学(北海道)
  • Year and Date: 2010-09-26
• [Presentation] Formation of Dislocation Structure during Cyclic Deformation of Ultrafine-Grained Aluminum at Low Temperatures; (2010)
  • Author(s): Y. Nakanishi, T. Fujii, S. Onaka and M. Kato
  • Organizer: Proceedings of the 12th International Conference on Aluminium Alloys
  • Place of Presentation: Yokohama,Japan
  • Year and Date: 2010-09-07
• [Presentation] Development of Dislocation Structures during Cyclic Deformation of Aluminum Single Crystals (2010)
  • Author(s): T. Fujii
  • Organizer: Proceedings of the 12th International Conference on Aluminium Alloys
  • Place of Presentation: Yokohama,Japan
  • Year and Date: 2010-09-07
• [Presentation] Cu-Ni-Si合金単結晶の繰り返し変形による軟化 (2010)
  • Author(s): 藤居俊之
  • Organizer: 銅及び銅合金研究強化・産学連携事業
  • Place of Presentation: 霞が関ビル(東京都)
  • Year and Date: 2010-07-26
• [Remarks]
  • URL: http://kamonohashi.iem.titech.ac.jp/fujii/
• [Patent(Industrial Property Rights)] 銅合金粉末,銅合金焼結体および高速鉄道用ブレーキライニング (2013)
  • Inventor(s): 香月太,石本史雄,神田修,阿佐部和孝,安達豪,藤居俊之
  • Industrial Property Rights Holder: 香月太,石本史雄,神田修,阿佐部和孝,安達豪,藤居俊之
  • Industrial Property Number: 特許、特願2013-61381
  • Filing Date: 2013-03-25