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

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