Grain Refinement of Combustion-synthesized NiAl by Addition of Al2O3 Particles.

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  • Matsuura Kiyotaka
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Kitamura Toshiki
    Graduate Student, Graduate School of Engineering, Hokkaido University
  • Kudoh Masayuki
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Itoh Youichi
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Ohmi Tatsuya
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

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Abstract

An intermetallic compound of mononickel aluminide (NiAl) is combustion-synthesized from a mixture of nickel and aluminum powders by a pseudo-Hot-Isostatic-Pressing (pseudo-HIPing) method. The effects of the addition of alumina (Al2O3) particles on the microstructure and mechanical properties of the combustion-synthesized NiAl is investigated. The density and hardness of the NiAl significantly increase with increasing pseudo-HIPing pressure applied during the combustion synthesis. The increase in the volume fraction of the added Al2O3 particles leads to a slight decrease in the density of the NiAl, but it does not affect the hardness. The grain size of NiAl decreases, as the volume fraction of the added Al2O3 particles increases and as the size of the Al2O3 particles decreases.

Journal

  • ISIJ International

    ISIJ International 37 (1), 87-92, 1997

    The Iron and Steel Institute of Japan

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