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1991 Fiscal Year Final Research Report Summary

Development of Advanced Heat Resistant Aluminides Produced by ma Process

Research Project

Project/Area Number 02555142
Research Category

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

Allocation TypeSingle-year Grants
Research Field 金属加工(含鋳造)
Research InstitutionNagaoka University of Technology

Principal Investigator

KOJIMA Yo  Nagaoka University of Technology, Faculty of Engineering, Professor, 工学部, 教授 (60016368)

Co-Investigator(Kenkyū-buntansha) OCHIAI Syouichi  The Nishi Tokyo University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70169324)
FUKUZAWA Yasushi  Nagaoka University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10126477)
Project Period (FY) 1990 – 1991
KeywordsIntermetallic compound / Dual phase / Mechanical alloying / Powder metallurgy / Aluminide / NiAl / Ni_3Al
Research Abstract

The intermetallics that belong to Ni-Nb-Al system, (Ni_3Al+Ni_3Nb), (NiAl + NiNbAl), (NiAl+Ni_3Al), NiAl and Ni_3Al were produced by mechanical alloying(MA)process with a view to refining microstructures. MA was carried out in the attritor mill using pure nickel, pure niobium powder and NiAl prealloyed powder as starting materials. MA powders were consolidated using the vacuum hot pressing.
Sintered aluminides showed fine grain structures with average grain diameter under 5 mu m and relative density above 96%. The combination of high strength and large fracture strain of more than 10% at room temperatures was confirmed by compression test for each aluminide except for both(Ni_3AI+Ni_3Nb) and (NiAl+NiNbAl). At high temperatures, these aluminides exhibited a steady state deformation and no fracture during testing. The strain rate sensitivity exponent of m (>O. 6) was observed for (Ni_3Al+Ni_3Nb) at 1173K. Such large m value more than 0.3 is believed to be associated with the development of superplasticity.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 落合 鍾一: "メカニカルアロイング法により製造したニッケルアルミナイドの機械的性質" 粉体および粉末冶金. 36. 683-687 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 落合 鍾一: "(NiAl+Ni_3Al)2相合金の熱調質処理による高強度化と超塑性の発現" 日本金属学会誌. 54. 301-306 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ochiai: "Microstructures and Mechanical Properties of Ni-Nb Aluminides Produced by MA Process" ISIJ International. 31. 1106-1112 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S. Ochiai, C. Nakano, Y. Kojima: "Mechanical Properties of Nickel-Aluminide Produced by Mechanical Alloying" J. Japan Inst. Powder & Powder Metallurgy. 36-6. 683-687 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Ochiai, I. Yamada, Y. Kojima: "Development of High Strength and Superplasticity in the Heat-refined (NiAl+Ni_3Al) Two-phase Alloy" J. Japan Inst. Metals. 54-3. 1990 (301-306)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Ochiai, T. Shirokura, Y. Doi, Y. Kojima: "Microstructures and Mechanical Properties of Ni-Nb Aluminides Produced by MA Process" ISIJ International. 31-10. 1991 (1106-1112)

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

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Published: 1993-03-16  

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