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1994 Fiscal Year Final Research Report Summary

Formation mechanisms and mechanical properties of interfacial intermetallic compounds

Research Project

Project/Area Number 05452287
Research Category

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

Allocation TypeSingle-year Grants
Research Field Structural/Functional materials
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

YAMAGUCHI Masaharu  Dept.of Materials Science and Engineering, Kyoto University, 工学部, 教授 (90029108)

Co-Investigator(Kenkyū-buntansha) INUI Haruyuki  Dept.of Materials Science and Engineering, Kyoto University, 工学部, 助手 (30213135)
Project Period (FY) 1993 – 1994
KeywordsInterfacial intermetallics / Mesoscopic / Interfacial structure / High resolution electron microscopy / Mechanical properties
Research Abstract

In the Ti-Al binary system, three different intermetallic compounds, namely Ti_3Al, TiAl and Al3Ti are formed. These three intermetallic compounds have potential as new light-weight high-temperature materials and thus their mechanical properties have been intensively investigated. In particular two-phase materials composed of TiAl and a small volume fraction of Ti_3Al have been attracting considerable attention. When Ti-Al alloys with nearly equiatomic compositions are cast, the alloys exhibit the lamellar structure composed of TiAl and Ti_3Al lamellae, The lamellae of Ti_3Al is often thin and sandwiched between the two neighboring TiAl lamellae. The TiAl/Ti_3Al lamellar structure can thus be used as a useful vehicle for studying effects of interfacial compound on the mechanical properties of interface. The Ti_3Al phase is much stronger than the TiAl phase and the large difference in strength between TiAl and Ti_3Al results in the large strain accumulations and incompatibilities at the TiAl/Ti_3Al interface. Thus, the TiAl/Ti_3Al/TiAl sandwich structure is brittle when it is stressed along the direction perpendicular to the interface. Various elements were added to TiAl/Ti_3Al two-phase alloys and their partition behavior between the two constituent phases was investigated to find elements which reduce the difference in strength between TiAl and Ti_3Al. Tin is found to exhibit such an beneficial effect on the interface. However, the results of the mechanical testing of Sn-bearing TiAl/Ti_3Al alloys were not as good as expected. This is because the Sn-bearing Ti_3Al phase exhibits a lower stringth than the binary Ti_3Al phase but it is still brittle.
Interface between MoSi_2 and SiC was also investigated and the two phases were found to be matched in an orientation relationship which was different from that reported previously.

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] H.Inui: "Low-temperature deformation of single cristals of D019 compounds" Phil.Mag.A. 69. 1161-1177 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Kawai: "Chemical effects on the intensity of radiative Auger satellite X-ray fluorescence spectra" Analyst. 119. 601-603 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K-F.Yao: "Plastic deformation of V-and Zr-alloyed PST TiAl in tension and compression at room temperature" Acta metall.mater.43. 1075-1086 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.N.Wang: "Effects of Sn additions on the microstructures and mechanical properties of two-phase TiAl alloys" Intermetallics. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ito: "Plastic deformation of MoSi2 single crystals" Phil.Mag.A. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Yamaguchi: "Intermetallic Compounds" John Wiley and Sons Ltd., 147-173 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Yamaguchi: "Physical Metallurgy and Processing of Intermetallic Compounds" Chapman and Hall (in press),

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Inui: "Low-temperature deformation of single crystals of a DO_<19> compound withan off-stoichiometric composition (Ti-36.5at%Al)" Phil.Mag.A. Vol.6 (6). 1161-1177 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Kawai: "Chemical effects on the intensity of K (Radiative Auger satellite) X-ray fluorescence spectra" Analyst. Vol.119 (April). 601-603 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K-F.Yao: "Plastic deformation of V-and Zr-alloyed PST TiAl in tension and compression at room temperature" Acta metall.mater.Vol.43 (3). 1075-1086 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Yokoshima: "Fracture behavior and toughness of PST crystals of TiAl" Acta mitall.mater.to be published.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.N.Wang: "Effects of Sn additions on the microstructures and tensile properties of two-phaseTiAl alloys" Intermetallics. to be published.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ito: "Plastic deformation of MoSi_2 single crystals" Phil.Mag.A. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamaguchi: "Al_3Ti and its delivatives (Chapter 7)" Intermetallic Compounds Vol.2 Practice 147-173 Edited by J.H.Westbrook and R.L.Fleischer John Wiley and Sons Ltd. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamaguchi: "Defect Structure (Chapter 1)" Physical Metallurgy and Processing of Intermetallic Compounds Edited by N.S.Stoloff and V.K.Sikka Chapman & Hall. (in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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