Abstract
The present work highlights the build up of the microsegregation coming from both solidification and high temperature solid state transformation in Ti-46Al-8Nb (at.%) alloy prepared by quench during directional solidification (QDS) experiments. Microstructure analysis of the QDS samples associated with quantitative chemical analysis were performed and compared to as-cast structures and heterogeneities. It is found that the microsegregation formed during solidification favours the β→α solid state transformation at higher temperatures and thus intensifies the solid state segregation.

Key words
titanium aluminides, TiAl, solidification, phase transformations, microstructure

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