Synthesis of TiAl-(TiB2+Ti2AlC)Composites Using Combustion Reaction Processing, Following Arc-melting.

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  • Mabuchi Hiroshi
    Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University
  • Shiraishi Satoru
    Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University
  • Tsuda Hiroshi
    Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University
  • Morii Kenji
    Department of Metallurgy and Materials Science, College of Engineering, Osaka Prefecture University

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  • Synthesis of TiAl TiB2+Ti2AlC Composite

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Abstract

To enhance the negligible low-temperature strength and ductility and low high-temperature strength of titanium aluminides, TiAl-(TiB2+Ti2A1C) composites were made by the combustion reaction processing using Ti, Al, and B4C powders, and homogenized by arc melting. The alloy composition included Ti52.2A145.6(B4C)2, 2 in at.%. The resulting composites had about 14 vol.% (TiB2+Ti2AIC) in the matrix TiAl with a lamellar structure of Ti3Al. In the homogenized specimens, such lamellar structures were not observed, therefore, the matrix after the homogenizing treatment consisted predominantly of the TiAl phase which is expected from the Ti-Al equilibrium phase diagram. On the other hand, smaller particles were visible in the matrix, and appeared to form in place of solutionizing lamellae. These particles have also identified as a Ti2A1C phase with an average particle size of about 100-200 run. This suggested that carbon atoms in the matrix, probably in the Ti3Al phase, formed carbide Ti2Al particles when the lamellar Ti3Al phase was disappeared during the homogenization treatment. It was found that the composite material has a high strength at both ambient and elevated (at 1173 K) temperatures ; about 900 and 500 MEN, respectively, and ambient-temperature ductility as large as 0.8% was obtained in bending.

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