Characterization of the precipitation process in a TiAl-based alloy with carbon and silicon additions

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Abstract
Minor additions of silicon and carbon in second-generation, fully lamellar gammatitanium aluminide alloys are known to enhance their creep resistance. Examination of such an alloy by means of transmission electron microscopy techniques, after creep testing, has revealed significant precipitation of carbide and silicide phases along gamma- gamma interlamellar boundaries. It is shown that many of the carbide and silicide precipitates form along dissolving alpha2 and/or B2 laths; the dissolution process taking place during ageing. Ageing experiments suggest that the driving force for the precipitation reaction is the accommodation of excess amounts of carbon and silicon, whose solubility in the matrix is extremely limited.

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