二段階燃焼合成法によるTiAl 基，Ni3Al 基複合金属間化合物の相・組織と機械的性質

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ABSTRACTTiAl base and Ni3Al base composite intermetallic compounds were investigated by Two-step combustion synthesis process. In TiAl–Ni3Al composite compound by the combustion synthesis, the products contain Ti2NiAl3 (τ3)and TiNi2Al (τ4) phases, and spoil the mechanical properties of the composite compound material. Therefore, Two-step combustion synthesis of TiAl base and Ni3Al base composite compounds were examined in compositions near the TiAl and Ni3Al of the Ti–Ni–Al systemElemental (Ti+Al) premixed compact was made to react by thermal explosion reaction as first step combustion synthesis. The synthesized TiAl product was grinded, and mixed with elemental Ti, Ni and Al powders again. The (TiAl+Ti+Ni+Al) mixed compact was made to react by thermal explosion reaction as second step combustion synthesis. For the products obtained, density, phase, microstructure, Vickers hardness, and compression strength were measured.By using Two-step combustion synthesis, TiAl base and Ni3Al base composite compounds could be fabricated. The TiAl base composite intermetallic compounds were so hard and so weak, to use for mechanical material. However Ni3Al base composite compounds contained a few Ti component exhibited superior ductility. Therefore, it was found that the addition of Ti component into Ni3Al is effective for improving the mechanical properties of Ni3Al compound.
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