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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Directional crystallisation of Ti–Al–Si in-situ composites

Jaromír Kopeček, Michal Novák, Dalibor Vojtěch and Pavel Lejček

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.


* Correspondence address, Dr. Jaromír Kopeček, Institute of Physics AS CR, Na Slovance 2, 18221 Praha 8, Czech Republic, Tel.: +420 266 052 899, Fax: +420 286 890 527, E-mail:

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Received: 2008-8-25
Accepted: 2008-12-21
Published Online: 2013-06-11
Published in Print: 2009-03-01

© 2009, Carl Hanser Verlag, München