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Abstract

The microstructure, nature, distribution, and chemical composition of the different phases obtained in γ-TiAl alloys with small amounts of silicon additions have been investigated. Based on the microstructures observed and results obtained via energy dispersive X -ray microanalysis, the approximate partial liquidus projection of the ternary Ti–Al–Si system in the range of compositions over which γ alloys exist, has been established. Two four phase invariant points on which peritectic reactions occur are present. The eutectic valley between β and Ti₅ (Si, Al)₃ phases exhibits a maximum point, and the liquidus surface in this region is of saddle type. The results were found to be in good agreement with predictions based on thermodynamic modelling.

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Liquidus projection of Ti–Al–Si ternary systemin vicinity of γ alloys

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