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1994 Fiscal Year Final Research Report Summary

Crystal Structure and Phase Stability of Intermetallic Compounds

Research Project

Project/Area Number 04239103
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionHokkaido University (1993)
Tokyo Institute of Technology (1992)

Principal Investigator

SUZUKI Tomoo  Hokkiado University, Dept.of Mat.Engr., Professor, 工学部, 教授 (80016782)

Co-Investigator(Kenkyū-buntansha) MOHRI Tetsuo  Hokkaido University, Dept.of Mat.Engr.Associate Professor, 工学部, 助教授 (20182157)
MORINAGA Masahiko  Nagoya University, Dept.of Mat.Sci.and Engr., Professor, 工学部, 教授 (50126950)
NAKAYAMA Yutaka  University of Osaka Prefecture, Dept.of Metallurgy and Met.Sci., Professor, 工学部, 教授 (90081364)
Project Period (FY) 1992 – 1994
Keywordsphase stability / Structure Map / DV-Xalpha calculation / CVM / Al_3Ti / CoAl / ductility / thermal conductivity
Research Abstract

The main objectives of the present project are to predict and to control a crystal structure and a microstructure of a given intermetallic compound (imc) based on the sound theoretical analysis. As potential theoretical tools, we adopted the electronic structure calculation based on the molecular orbital method and Cluster Variation Method of statistical mechanics. The former was utilized to construct a "Structural Map" in which a stability region of a particular crystal structure is specified. The latter is combined with the ab initio internal energy calculation to obatain a phase diagram of an alloy system in which an imc of interest appears. These theoretical efforts are reflected in the folowing experimental achievments.
1. Various alloying elements were found to stabilize the L12 ordered structure for the Al3Ti imc which is characterized by a D022 structure in its binary state. Among the alloying elements, it was confirmed that Cr and Mn were most effective in improving the ductility.
2. The phase diagrams are established for ternary and quartery systems based on Ni-Al and Co-Al binary systems, and the improvement of mechanical properties was attempted in the multiphase region of the phase diagram. Ni3Al-NiBe and Co3Ti-Ni3Al are the succesful examples for which ductility is endowed.
In addition, measurements of thermal conductivity are systematically performed for a series of intermetallic compound.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Yoshihiro TERADA: "Thermal conductivity of B2-type aluminides and titanides" Intermetallics. 3. 347-355 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshihiro TERADA: "Application of Norbury rule to Thermal conductivity in Intermetallic Compounds" Mat.Res.Soc.Symp.Proc.364. 201-206 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Junji NAKATA: "Thermal conductivity in X2YZ Heusler Type Intermetallic Compounds" Materials Transactions,JIM. 37. 442-447 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.MABUCHI: "Effects of manganese on the L12 compound formation in A13Ti-base alloys" Intermetallics. 印刷中.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.YUKAWA: "Alloying Effects on the Electronic Structures of LaNi5 containing Hydrogen Atoms" Intermetallics. 印刷中.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.MOHRI: "Theoretical investigation of the phase stability of intermetallic compounds by CVM and PPM" Intermetallics. 印刷中.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshihiro TERADA,Kenji OKUBO,Kiyotaka NAKAGAWA,Tetsuo MOHRI and Tomoo SUZUKI: "Thermal conductivity of B2-type aluminides and titanides" Intermetallics. 3. 347-355 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshihiro TERADA,Tetsuo MOHRI and Tomoo SUZUKI: "Application of Norbury rule to Thermal conductivity in Intermetallic Compounds" Mat.Res.Soc.Symp.Proc.364. 201-206 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junji NAKATA,Yoshihiro TERADA,Satoshi TAKIZAWA,Kenji OKUBO,Tetsuo MOHRI and Tomoo SUZUKI: "Thermal conductivity in X2YZ Heusler Type Intermetallic Compounds" Materials Transactions, JIM.37. 442-447 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.MABUCHI,A.KITO,M.NAKAMOTO,H.TSUDA and Y.NAKAYAMA: "Effects of manganese on the L12 comopund formation in Al3Ti-base alloys" Intermetallics. in print.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.YUKAWA,Y.TAKAHASHI and M.MORINAGA: "Alloying Effects on the Electronic Structures of LaNi5 containing Hydrogen Atoms" Intermetallics. in print.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.MOHRI,C.-S.OH,S.TAKIZAWA and T.SUZUKI: "Theoretical investigation of the phase stability of intermetallic compounds by CVM and PPM" Intermetallics. in print.

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

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Published: 1999-03-09  

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