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Submicron-grained multiphase TiAlSi alloys: Processing, characterization, and microstructural design

Published online by Cambridge University Press:  31 January 2011

R. Bohn,
G. Fanta,
T. Klassen and
R. Bormann
R. Bohn
Affiliation:
AB Material Science, Technical University Hamburg–Harburg, D-21073 Hamburg, Germany, and Institute for Materials Research, GKSS Research Center Geesthacht, D-21502 Geesthacht, Germany
G. Fanta
Affiliation:
Institute for Materials Research, GKSS Research Center Geesthacht, D-21502 Geesthacht, Germany
T. Klassen
Affiliation:
Institute for Materials Research, GKSS Research Center Geesthacht, D-21502 Geesthacht, Germany
R. Bormann
Affiliation:
AB Material Science, Technical University Hamburg–Harburg, D-21073 Hamburg, Germany, and Institute for Materials Research, GKSS Research Center Geesthacht, D-21502 Geesthacht, Germany
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Abstract

Prealloyed powders of the intermetallic γ–TiAl phase and the ceramic Ξ–Ti5Si3 phase were high-energy milled and hot-isostatically pressed (HIP) to produce silicide dispersed composite materials with grain sizes in the submicron and nanometer range. The amorphous state of the as-milled powders crystallizes via a multistep decomposition reaction during degassing at 440 °C and HIP. At a pressure of 200 Mpa HIP-temperatures as low as 750 °C are sufficient for a complete densification of the milled powder. The microstructure of the compacts is very homogeneous and consists of equiaxed γ–TiAl crystals and Ξ–Ti5(Si,Al)3 particles. Depending on the silicon content, these particles are interspersed within the grain boundary network of the γ–TiAl phase or dispersed inside the γ grains. With respect to technical applications, submicron-grained composites are regarded as promising precursor materials that should allow for easy hot working in the as-prepared state as well as for high-temperature structural applications after a suitable transformation of the microstructure.

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Journal of Materials Research , Volume 16 , Issue 6 , June 2001, pp. 1850 - 1861
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Copyright © Materials Research Society 2001

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