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Structural Analysis of diffuse scattering appeared in high-purity TiAl alloys

Research Project

Project/Area Number 05650619
Research Category

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

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

INUI Haruyuki  Kyoto University, Faculty of Engineering, Department of Materials Science and Engineering, Research Associate, 工学部, 助手 (30213135)

Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordslight-weight high-temperature material / TiAl alloy / high-resolution electron microscopy / electron diffraction / diffuse scattering / defect structure / 電子回析 / 短範囲規則化
Research Abstract

Two-phase TiAl alloys containing a small fraction of Ti_3Al have attracted a great deal of interest as a new class of high-temperature materials. In electron diffraction patterns of Ti-56at. % Al alloys which have been considered to be well within the TiAl single-phase field, we have observed diffuse intensity which can not be considered to come from the TiAl phase with the Ll_0 structure. Such diffuse intensity iis observed in diffraction patterns taken along <001], <100], <111] and <211] but not in those taken along <110], <011] and <112]. Ahthough we firstly inferred that the occurrence of such diffuse intensity is closcly related to the existence of oxygen impurity in the TiAl phase, experiments conducted on Ti-56at. %Al alloys containing 300,500 and 800 wt. ppm oxygen have revealed that the diffuse intensity does not depend on oxygen content in these alloys. However, the diffuse intensity clearly depends on Al content. While no diffuse intensity is observcd for alloys containing less than 53at. %Al, the diffuse intensity increases with increasing Al content for alloys containing more than 54at. %Al. Close examination of the diffuse intensity has in dicated that the intensity is from the Al_2Ti phase. HREM observations along <100] have revealcd a fine domain structure of the Al_2Ti phase. The volume fraction of the Al_2Ti domains increases with increasing Al content, consistent with the results obtained from diffraction experiments. These results clearly indicate that a composition of Ti-54at. %Al is in the TiAl/Al_2Ti two-phase field and that the composition range where TiAl single-phased alloys are obtained should be much smaller than that ever considered.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 乾 晴行: "TiAl基二相化合物の構造と機械的性質" 日本金属学会報. 33. 231-240 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Inui: "Environmental embrittlement of polysynthetically twinned(PST) crystals of binary and some ternary TiAl compounds" Transaction of the Materials Research Society of Japan. 13B. 61-73 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.-F.Yao: "Plastic deformation of V- and Zr-alloyed PST TiAl in tension and compression at room temperature" Acta Metallurgica et Materialia. 43. 1075-1086 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 松室 光昭: "TiAl単結晶(Ti-56mol%Al)における活動すべり系" 日本金属学会誌. 印刷中. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Inui: "Temperature dependence of yield stress, tensile elongation and deformation structures in polysynthetically twinned(PST) crystals of TiAl" Philosophical Magazine. 印刷中. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Yamaguchi: "Gamma titanium aluminide alloys" MRS Symp. Proc. on High-Temperature Ordered Intermetallic Alloys VI. 印刷中. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Inui: "Structural Characteristics and Mechanical Properties of TiAl-based Two-phase compounds." Materia Japan. 33. 231-240 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Inui: "Environmental embrittlement of polysynthetically twinned (PST) crystals of binary and some ternary TiAl compounds." Transaction of the Materials Research Society of Japan. 13B. 61-73 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.F.Yao: "Plastic deformation of V- and Zr-alloyed PST TiAl in tension and compression at room temperature." Acta Metallurgica et Materialia. 43. 1075-1086 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Matsumuro: "Operative slip systems in TiAl single crystals (Ti-56mol. %Al) ." J.Japan Inst. of Metals. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Inui: "Temperature dependence of yield stress, tensile elongation and deformation structures in polysynthetically twinned (PST) crystals of TiAl." Philosophical Magazine. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Yamaguchi: "Gamma titanium aluminide alloys." MRS Symp. Proc. on High-Temperature, Ordered Intermetallic Alloys VI.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 乾 晴行: "TiAl基二相化合物の構造と機械的性質" 日本金属学会報. 33. 231-240 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Inui: "Environmental embrittlement of polysynthetically twinned(PST)crystals of binary and some ternary TiAl compounds" Transaction of the Materials Research Society of Japan. 13B. 61-73 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.-F.Yao: "Plastic deformation of V-and Zr-alloyed PST TiAl in tension and compression at room temperature" Acta Metallurgica et Materialia. 43. 1075-1086 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 松室 光昭: "TiAl単結晶(Ti-56mol%Al)における活動すべり系" 日本金属学会誌. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Inui: "Temperature dependence of yield stress,tensile elongation and deformation structures in polysynthetically twinned(PST)crystals of TiAl" Philosophical Magazine. (印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Yamaguchi: "Gamma titanium aluminide alloys" MRS Symp.Proc.on High-Temperature Ordered Intermetallic Alloys VI. 364(印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Inui: "Mechanical properties of the intermetallic compounds based on TiAl and Al_3Ti" Proceedings of International Symposium on Light Materials for Transportation Systems(LiMAT-93). 15-26 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Yamaguchi: "TiAl compounds for structural applications" Proceedings of International Symposium on Structural Intermetallics(ISSI). 127-142 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 乾 晴行: "TiAl基二相化合物の構造と機械的性質" 日本金属学会報(まてりあ). 33(印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Inui: "Environmental embrittlement of polysynthetically twinned(PST)crystals of binary and some ternary TiAl compounds" Transaction of the Materials Research Society of Japan. (印刷中). (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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