Microstructure and Mechanical Properties of TiAl-Ti2AlC Composites Produced by Combustion Reaction Process.

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  • Mabuchi Hiroshi
    Department of Metallurgy and Materials Sicence, University of Osaka Pretecture, and Research Institute for Advanced Science and Technology, University of Osaka Prefecture
  • Kiji Noboru
    Graduate School, University of Osaka Prefecture
  • Tsuda Hiroshi
    Department of Metallurgy and Materials Sicence, University of Osaka Prefecture
  • Nakayama Yutaka
    Department of Metallurgy and Materials Sicence, University of Osaka Prefecture

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  • 金属間化合物の粉末冶金と諸物性　燃焼反応プロセスにより作製したＴｉＡｌ‐Ｔｉ２ＡｌＣ複合材料の組織と機械的性質
  • ネンショウ ハンノウ プロセス ニ ヨリ サクセイシタ TiAl Ti2AlC

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Abstract

To enhance the negligible low-temperature ductility and low high-temperature strength of titanium aluminides, TiAl-Ti2AlC composites were made by the combustion reaction process, following arc-melting. The alloy compositions included Ti52Al43C5, Ti50Al45C5 and Ti48Al47C5 in at%. The resulting composites had about l8vol%Ti2AlC in the matrix TiAl with a lamellar structure of Ti3Al. In the annealed specimens, smaller particles were visible in the matrix, and appeared to form in place of solutionizing lamellae. Therefore, carbon atoms in the matrix, probably in the Ti3Al phase, formed carbide Ti2AlC particles with the smaller sizes. On the other hand, the behavior with regard to change in lattice parameters and Vickers hardness suggested a reduction in the solubility of carbon in the TiAl phase with decrease in annealing temperature. For the Ti50Al45C5 alloy, annealed at 1273K, ambient-temperature ductility up to 0.9% was achieved in bending.

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