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DEVELOPEMENT OF MICROSTRUCTURE-CONTROLLED B2-ORDERED HIGH TEMPERATURE INTERMETALLICS

Research Project

Project/Area Number 07555503
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Structural/Functional materials
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

NEMOTO Minoru  Kyushu Univ., Dpt.Mater.Sci.& Eng., Prof., 工学部, 教授 (90005265)

Co-Investigator(Kenkyū-buntansha) TIAN Wen-huai  Kyushu Univ., Dpt.Mater.Sci.& Eng., Ass., 工学部, 助手 (50223631)
SANO Takeshi  Kyushu Univ., Dpt.Mater.Sci.& Eng., Ass., 工学部, 助手 (70037810)
HORITA Zenji  Kyushu Univ., Dpt.Mater.Sci.& Eng., Ass.Prof., 工学部, 助教授 (20173643)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Keywordsintermetallics / precipitation / dislocation / diffusion / coherency / strength / TEM / AEM / B2型金属間化合物 / 超耐熱金属間化合物 / 透過電子顕微鏡 / 小型ダブルシア-試験法 / クリープ変形挙動 / 相分離
Research Abstract

A wide variation of microstructures can be obtained in B2-ordered intermetallicsdepending on the chemical compositions and aging temperatures. The crystal anisotropy and the deviation from the stoichiometric composition play important roles in the microstructure and the strength variation during aging. The lattice misfits at interphase interfaces in NiAl (B2)-Ni_2AlTi (L2_1) and NiTi (B2)-Ni_2AlTi (L2_1) pseudobinary systems have been estimated by transmission electron microscopy (TEM). When the size of Ni_2AlTi precipitates is smaller than a critical value, the precipitates keep their lattice coherency with the NiAl and NiTi matrices. After longer periods of aging the Ni_2AlTi precipitates lose their coherency by introducing interface dislocations surrounding them. The coherency loss occurs catastrophically and the shape of the precipitates changes to a globular one after the loss of coherency, while keeping the cubic-cubic orientation relationship. The morphology of dislocations intr … More oduced by the deformation of B2-ordered NiTi containing fine precipitation of L2_1-ordered Ni_2AlTi is correlated with the yield strength variations during aging and deformation temperatures. The Burgers vectors of the glide dislocations are of a <100> type and shear the H-phase at the underaged state but by pass at the overaged state. In the underaged superdislocation pairs are formed by the deformation at room temperature. With increasing the deformation temperature dislocations start to move as wavy single dislocations. In NiAl contaning 2 and 5 mol% of Hf, fine plate-like L2_1-type Ni_2AlHf precipitates are formed on the {111} planes of the NiAl matrix keeping the lattice coherency with the matrix lattice at the beginning of aging. By longer periods of aging Ni_2AlHf precipitates lose their coherency and change their morphology to the spherical ones surrounded by misfit dislocations. The lattice misfit between the Ni_2AlHf precipitate and the NiAl matrix is about four times as large as that of NiAl-Ni_2AlTi system. The high temperature strength as well as creep strength increase appreciably by the precipitation of fine Ni_2AlHf phase. TEM obsernvations suggested that the attractive interactions for dislocations at the particle/matrix interfaces plays an important role to increase the high temperature strength of NiAl-based alloys. Less

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] 大石敬一郎: "NiAl-NiTi擬二元系合金における相分離と硬化" 日本金属学会誌. 60・3. 239-246 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] W.H.Tian: "Precipitation of Ni_2Al in B2-ordered Ni(Al,Ta)" Proc.6th Asia-Pacific Conf.on Electron Microscopy. 227-228 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Watanabe: "Quantitative X-ray Microanalysis and Thickness Determination Using ζ-Factor" Proc.Microscopy and Microanalysis 1996. 580-581 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Watanabe: "Absorption Correction and Thickness Determination Using the ζ-Factor in Quantitative X-ray Microanalysis" Ultramicroscopy. 65・12. 187-198 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Watanabe: "Analytical Electron Microscopy Study of Diffusion-bonded Multiphase System" Interface Science. 4・1. 229-241 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Oh-ishi: "Lattice Misfit in a Pseudobinary NiAl(β_1)-Ni_2AlTi(H)-NiTi(β_2)System" Materials Transactions,JIM. 38・(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大石敬一郎: "β-NiAl中におけるL2_1-Ni_2AlHf相の析出" 日本金属学会誌. 61・2(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Oh-ishi and M.Nemoto: "Phase Decomposition and Hardening in NiAl-NiTi (in Japanese)." J.Japan Inst.Metals. 60-3. 239-246 (1966)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Pseudo-binary Alloy System W.H.Tian and M.Nemoto: "Precipitation of Ni_2Al in B2-ordered Ni (Al, Ta)" Proc.6the Asia-Pacific Conf.on Electron Microscopy. 277-278 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Watanabe, Z.Horita and M.Nemoto: "Quantitative X-ray Microanalysis and Thickness Determination Using zeta-Factor" Proc.Microscopy and Microanalysis. 580-581 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Watanabe, Z.Horita and M.Nemoto: "Absorption Correction and Thickness Determination Using the zeta-Factor in Quantitative X-ray Microanalysis" Ultramicroscopy. Vol.65-12. 187-198 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Watanabe, Z.Horita and M.Nemoto: "Analytical Electron Microscopy Study of Diffusion-Bonded Multiphase System" Interface Science. 4(1). 229-241 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Oh-ishi, Z.Horita and M.Nemoto: "Lattice Misfit in a Pseudobinary NiAl (beta_1)-Ni_2AlTi (H)-NiTi (beta_2) System" Materials Transactions, JIM. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Oh-ishi and M.Nemoto: "Precipitation of L2_1-Ni_2AlHf Phase in beta-NiAl (in Japanese)." J.Japan Inst.Metals. 61-2 (in press). (1967)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大石敬一郎: "NiAl-NiTi擬二元軽合金における相分離と硬化" 日本金属学会誌. 60・3. 239-246 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] W・H・Tian: "Precipitation of Ni_2Al in B2-ordered Ni(al,Ta)" Proc.6the Asia-Pacific Conf. on Electron Microscopy. 227-228 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Watanabe: "Quantitative X-ray Microanalysis and Thickness Determination Using ζ-Factor" Proc.Microcopy and Microanalysis 1996. 580-581 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Watanabe: "Absorption Correction and Thickness Determination Using ζ-Factor in Quantitative X-ray Microanalysis" Ultramicroscopy. 65・12. 187-198 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Watanabe: "Analysis Electron Microscopy Study of Diffusion-bonded Multiphase System" Interface Science. 4・1. 229-241 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] K.Oh-ishi: "Lattice Misfit in a Pseudobinary NiAl(β_1)-Ni_2AlTi(H)-NiTi(β_2)System" Materials Transactions,JIM. 38(印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大石敬一郎: "β-NiAl中におけるL2_1-Ni_2AlHf相の析出" 日本金属学会誌. 61・2(印刷中). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Nemoto: "Phase Decomposition and Deformation of Ll_2-Ordered Co-Rich Co_3Ti" Mat.Res.Soc.Symp.Proc.364. 849-854 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] M.Furukawa: "An Investigation of Strain Hardening and Creep in an Al-6061/Al_2O_3 Metal Matrix Composite" Metall.Mater.Trans.A,. 26A. 633-639 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] M.Watanabe: "Intrefacial Structure and Composition in Ni/Ni_3Al Diffusion Couples" Trans.Mat.Res.Soc.Jpn.16B. 1429-1432 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] N.Komai: "Interdiffusivity Measurements and Interface Observations Using Ni/Ni_3Ge Diffusion Couples" Acta Metall.Mater.43. 2967-2974 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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