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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Metallurgy of gamma TiAl based alloys
 Zemčík, L. ; Dlouhý, Antonín
The present paper deals with the basic metallurgical processes associated with the investment casting of intermetallic alloys based on gamma TiAl. The analysis focuses on the evaporation of the aluminium from the melt, chemical reactions between the molten intermetallic, the ceramic mould and crucible and also on the reactions between the melt and the residual gases present in the atmosphere of the vacuum furnace. Results of the thermodynamic models are applied to the experimental melts of the Ti-48Al-2Cr-2Nb-1B intermetallic alloy in the vacuum induction furnace.
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Metallography of gamma TiAl intermetallic casts
 Dlouhý, Antonín ; Válek, Robert ; Svoboda, Milan ; Zemčík, L.
A quantitative metallographic study was performed which focussed on the cast versions of advanced intermetallic alloys based on gamma TiAl phase. Specimens cut out of cast rods and turbine blades exhibited two pronounced microstructural characteristics: (i) a preferential orientation of lamellae in columnar grains below the cast surface and (ii) increasing fraction of equiaxed grains towards the central part of the casts. The relation between the particular microstrucrure and creep strength has been documented.
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