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Improvement of Room Temperature Ductility of Ti-40 50 at%Al Alloys through Microstructural Controll by Heat Treatment

Research Project

Project/Area Number 02452243
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionTokyo Institute of Technology

Principal Investigator

KIKUCHI Makoto  Tokyo Institute of Technology, Dept. of Metall., 工学部, 教授 (30089817)

Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1991: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1990: ¥5,600,000 (Direct Cost: ¥5,600,000)
KeywordsTitanium Aluminides / gamma / alpha_2 Lamellar Structure / Primary Lamellar Structure / Corsened Lamellar Structure / Discontinuous Corsening / 一次微細層状組織 / 不連続粗大化層状組織 / ドメイン / 逆位相境界エネルギ-
Research Abstract

It has been commonly accepted that a microstructure consisting of gamma/ alpha_2/gamma lamellae improves the ductility of gamma titanium aluminides. In this program, we have established that there are two formation mechanisms of gamma/alpha_22/gamma lamellar microstructures, which we proposed to call as primary lamellar microstructure : P-LMS and discontinuously corsened lamellar microstructure : DC-LMS.
1)Primary gamma/alpha_2/gamma lamellar microstructure : P-LMS
Formation of the primary gamma/alpha_2/gamma lamellar microstructure was investigated using a Ti-40at%Al binary alloy. Upon quenching a disordered hcp alpha phase, stable at higher temperatures, to gamma+ alpha_2 two phase region, ordering from alpha to alpha_2 took place first, followed by precipitation of gamma plates on the basal plane of the alpha_2 matrix as a habit plane. Rapid lengthening of the gamma plates along the only one existing habit plane resulted in a seemingly perfect planar layer alignment of gamma and alpha_2 alternate lamellae. Variant distribution in the gamma plates was experimentally determined. Relative orientation relationships were discussed among independently grown gamma plates.
2)Discontinuously corsened gamma/alpha_2/gamma lamellar microstructure : DC-LMS.
Discontinuous coarsening(DC)of the P-LMS was studied in a temperature range between 1073 and 1473 K, using four Ti-Al binary alloys containing between 40 and 47 at%Al. DC started from the original alpha grain boundary. The migration rate of the advancing front of DC decreased with reaction time. The finer intelamellar spacing of P-LMS enhanced, while the larger volume fraction of alpha_2 phase beyond 50 pct in P-LMS inpeded, DC. DC divided a primary lamellar domain, whose size is the same as the original alpha grain size, into smaller colonies, within which not only the interlamellar spacing of the lamellae was larger, but also their alignment was less planar.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 山辺 容子,菊池 實: "TiAlにおけるγ/α_2/γ層状組織の生成過程と構造" 耐熱金属材料第123委員会研究報告. 31. 179-194 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 山辺 容子,菊池 實: "TiーAl2元合金におけるγ/α_2層状組織の生成過程と構造" 日本金属学会会報. 30. 37-42 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 菊池 實,山辺 容子: "金属間化合物の組織制御 ーTiAl系を中心にー" 日本金属学会 分科会シンポジウム「無機系材料の組織制御と超微細組織」. 17-20 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Makoto KIKUCHI,Yoko YAMABE: "Mechanism of Formation of Primary γ/α_2 Lamellar Microstructure in Titanium Aluminides" Proc.JIMIS-6 Intermetallic Compounds. 815-819 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yoko YAMABE,Noriyuki HONJO,Makoto KIKUCHI: "Discontinuous Coarsening of γ/α_2 Lamellar in Titanium Aluminides" Proc.JIMIS-6 Intermetallic Compounds. 821-825 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yoko YAMABE,Makoto KIKUCHI: "Distribution of Variants in γ Plate in Primary γ/α_2 Lamellar Microstructure of a Ti-40at% Al Alloy" Mater.Sci.Eng.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yoko YAMABE and Makoto KIKUCHI: "Evolution and Microstructure of gamma/alpha_2/gamma Lamellar Morphology in TiAl" Report 123rd Committee on Heat-Resisting Metals and Alloys. 31[2]. 179-194 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yoko YAMABE and Makoto KIKUCHI: "Evolution and Microstructure of gamma/alpha_2 Lamellar Microconstituent in Ti-Al Binary Alloys" Bulletin Jpn. Inst. Matals. 30[1]. 37-42 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Makoto KIKUCHI and Yoko YAMABE: "Mechnism of Formation of Primary gamma/alpha_2 Lamellar Microstructure in Titanium Aluminides" Proc. Jpn. Inst. Met. Symp. Intermetallic Compounds. 815-819 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yoko YAMABE and Makoto KIKUCHI: "Discontinuous Coarsening of gamma/alpha_2 Lamellar in Titanium Aluminides" Proc. Jpn. Inst. Met. Symp. Intermetallic Compounds. 821-825 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yoko YAMABE and Makoto KIKUCHI: "Distribution of Variants in gamma Plates in Primary gamma/alpha_2 Lamellar Microstructure of a Ti-40at% Al Alloy" Mater. Sci. Eng.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 山邉 容子,菊池 實: "γTiAl合金におけるγ/α_2微細層状組織の形成過程" 日本金属学会講演概要集. 311 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 菊池 實,山邉 容子: "金属間化合物の組織制御ーTiAl系を中心にー" 日本金属学会分科会シンポジウム「無機系材料の組織制御と超微細組織」. 17-20 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] Makoto KIKUCHI,Yoko YAMABE: "Mechanism of Formation of Primary γ/α_2 Lamellar Microstructure in Titanium Aluminides" Proc.JIMISー6 Intermetallic Compounds. 815-819 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Yoko YAMABE,Noriyuki HONJO,Makoto KIKUCHI: "Discontinuous Coarsening of γ/α_2 Lamellae in Titanium Aluminides" Proc.JIMISー6 Intermetallic Compounds. 821-825 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 山邉 容子,菊池 實: "γTiAl合金におけるα_2相ドメインとγ相板ドメインの関係" 日本金属学会講演概要集. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 山辺 容子,菅原 克生,菊池 實: "TiAlにおけるγ/α_2/γ層状組織の構造" 日本金属学会講演概要集. 409 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 山辺 容子,菊池 實: "TiAlにおけるγ/α_2/γ層状組織の生成過程と構造" 耐熱金属材料第123委員会研究報告. 31. 179-194 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 山辺 容子,菊池 實: "TiーAl2元合金におけるγ/α_2層状組織の粗大化" 日本金属学会講演概要集. 264 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yoko YAMABE,Makoto KIKUCHI: "Decomposition of Alpha Phase in Tiー40%Al Alloy" 日本MRS第2回年次総会・学術シンポジウム講演要旨集. M32 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 山辺 容子,菊池 實: "TiーAl2元合金におけるγ/α_2層状組織の生成過程と構造" 日本金属学会会報. 30. 37-42 (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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