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The effect of solid-state phase transformations on grain refinement of cast peritectic TiAl--based alloy with nominal composition Ti-47Al-5Nb-0.2B-0.2C (at.%) has been investigated. Three multi-stage heat treatment routes consisting of pretreatment in single α phase field followed by air, oil or water cooling and subsequent annealing in α + γ or single α fields were applied to refine grain structure of the alloy. The microstructure of the as-cast samples consists of coarse fully lamellardoi:10.4149/km_2018_5_277 fatcat:fl6xpu7z4jfwzbs54pjd7vahu4