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Clarification of the origin of embrittlement of beta-Ti alloys, and the improvement of their mechanical properties by focusing on the deformation induced omega-phase transformation

Research Project

Project/Area Number 20760471
Research Category

Grant-in-Aid for Young Scientists (B)

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

Principal Investigator

HAGIHARA Koji  Osaka University, 工学研究科, 助教 (10346182)

Project Period (FY) 2008 – 2009
Project Status Completed (Fiscal Year 2009)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2008: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsβ-Ti合金 / ω相 / 疲労 / 疲労軟化 / 単結晶 / 脆化 / 力学特性 / 塑性異方性 / 相安定性 / 応力誘起
Research Abstract

We found the peculiar phenomenon of the dynamical precipitation of ω-phase during the cyclic deformation in a kind of β-Ti single crystals (Ti-35Nb-10Ta-5Zr) for the first time. We clarified that the crystal orientation (variant) of the formed ω-phase can be controlled by changing the Burgers vector of the dislocation moving during the cyclic deformation. This demonstrates that the formation mechanism of the cyclic deformation induced ω-phase is directly related to the to-and-fro motion of dislocations. In addition, we clarified that the β-Ti single crystal containing the oriented ω-phases shows strong plastic anisotropy depending on the loading orientation, which strongly affects the brittle features of the Ti-crystal in which the ω-phases were precipitated.

Report

(3 results)
  • 2009 Annual Research Report   Final Research Report ( PDF )
  • 2008 Annual Research Report
  • Research Products

    (14 results)

All 2009 2008

All Journal Article (9 results) (of which Peer Reviewed: 9 results) Presentation (5 results)

  • [Journal Article] Controlling factors on the fatigue behaviour of Ti-Nb-Ta-Zr alloys single crystals2009

    • Author(s)
      K. Hagihara, T. Nakano, M. Niinomi
    • Journal Title

      Proc. of PFAM 18

      Pages: 1023-1030

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Oxygen distribution in titanium single crystal fabricated by floating-zone method under extremely low oxygen partial pressure2009

    • Author(s)
      K. Hagihara, T. Tachibana, K. Sasaki, Y. Yoshida, N. Shirakawa, T. Nagasawa, T. Narushima, T. Nakano
    • Journal Title

      Materials transactions 50

      Pages: 2709-2715

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Single-crystal growth and plastic deformation behaviour of a Ti-15Mo-5Zr-3Al alloy for biomedical application2009

    • Author(s)
      S. -H. Lee, K. Hagihara, M. -H. Oh, T. Nakano
    • Journal Title

      Journal of physics 165

      Pages: 120861-4

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Controlling factors on the fatigue behaviour of Ti-Nb-Ta-Zralloys single crystals2009

    • Author(s)
      K.Hagihara, T.Nakano, M.Niinomi
    • Journal Title

      Proc.of PFAM 18

      Pages: 1023-1030

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Oxygen distribution in titanium single crystal fabricated by floating-zone method under extremely low oxygen partial pressure2009

    • Author(s)
      K.Hagihara, T.Nakano, et al.
    • Journal Title

      Materials transactions 50

      Pages: 2709-2715

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Single-crystal growth and plastic deformation behaviour of a Ti-15Mo-5Zr-3Al alloy for biomedical application2009

    • Author(s)
      S.-H. Lee, K.Hagihara, M.-H.Oh, T.Nakano
    • Journal Title

      Journal of physics (Conf.ver) 165

      Pages: 0120861-4

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Peculiar elastic behavior of Ti-Nb-Ta-Zr single crystals2008

    • Author(s)
      M. Tane, S. Akita, H. Nakajima, T. Nakano, K. Hagihara, Y. Umakoshi, M. Niinomi
    • Journal Title

      Acta Materialia 56

      Pages: 2856-2863

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] 極低酸素分圧雰囲気下でのTi単結晶の帯溶融育成2008

    • Author(s)
      萩原幸司、橘孝洋、佐々木啓太、吉田良由、白河直樹、長澤亨、成島尚之、中野貴由
    • Journal Title

      日本金属学会誌 72

      Pages: 928-934

    • NAID

      10024404824

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] 極低酸素分圧雰囲気下でのTi単結晶の帯溶融育成2008

    • Author(s)
      萩原幸司、中野貴由, 他
    • Journal Title

      日本金属学会誌 72

      Pages: 928-934

    • NAID

      10024404824

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Presentation] Controlling factors on the fatigue behaviour of Ti-Nb-Ta-Zr alloys single crystals2009

    • Author(s)
      K. Hagihara, T. Nakano, M. Niinomi
    • Organizer
      PFAM 18 (Processing and Fabrication of Advanced Materials)
    • Place of Presentation
      Tohoku University
    • Year and Date
      2009-12-13
    • Related Report
      2009 Final Research Report
  • [Presentation] Controlling factors on the fatigue behaviour of Ti-Nb-Ta-Zr alloys single crystals2009

    • Author(s)
      K.Hagihara, T.Nakano, M.Niinomi
    • Organizer
      International conference on Processing and Fabrication of Advanced Materials (PFAM 18)
    • Place of Presentation
      東北大学(日本、仙台)
    • Year and Date
      2009-12-12
    • Related Report
      2009 Annual Research Report
  • [Presentation] Ti-15Mo-5Zr-3Al単結晶の育成と圧縮変形挙動2009

    • Author(s)
      李尚勲、萩原幸司、中野貴由
    • Organizer
      日本金属学会2009春期大会
    • Place of Presentation
      東京工業大学
    • Year and Date
      2009-03-28
    • Related Report
      2009 Final Research Report
  • [Presentation] 生体用β 型Ti-Nb-Ta-Zr合金単結晶における疲労変形誘起ω相の形成2008

    • Author(s)
      萩原幸司、中野貴由、馬越佑吉、園浦章弘、新家光雄
    • Organizer
      日本金属学会2008秋期大会
    • Place of Presentation
      熊本大学
    • Year and Date
      2008-09-23
    • Related Report
      2009 Final Research Report
  • [Presentation] 生体用β型Ti-Nb-Ta-Zr合金単結晶における疲労変形誘起ω相の形成2008

    • Author(s)
      萩原幸司、中野貴由, 他
    • Organizer
      日本金属学会2008秋期大会
    • Place of Presentation
      熊本大学
    • Year and Date
      2008-09-23
    • Related Report
      2008 Annual Research Report

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Published: 2008-04-01   Modified: 2016-04-21  

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