Abstract
The study of unidirectional crystallisation of a Ti-19Al-11Si (at.%) alloy by the floating zone method with optical heating is described. While the homogeneous eutectic composites with rod-shaped Ti5Si3 precipitates grow at a rate of 5 mm · h– 1, an inhomogeneous structure of the composite with primarily crystallised Ti5Si3 silicides was obtained at the rate of 18.8 mm · h– 1. The cracking of the reinforcing Ti5Si3 silicides is followed by cracking of the Ti3Al matrix phase due to a large difference between the coefficients of thermal expansion of both phases.
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