Burger
Journalpaper

Alloy design concepts for refined gamma titanium aluminide based alloys

Abstract

The influence of the Al content and the addition of further alloying elements on the cast microstructure of γ(TiAl) + α2(Ti3Al) alloys has been examined. The results show that particularly fine and homogeneous microstructures without strong segregation can be obtained for certain alloy compositions solidifying through the β phase. This behavior can be attributed to the avoidance of peritectic solidification and to the alloying influence on the kinetics of the β implies α transformation following solidification. The experimental findings were used to propose a design concept for γ-TiAl + α2-Ti3Al alloys. This concept aims at the production of high-quality castings as well as at ingot material for wrought processing routes because the chemically homogeneous and fine-grained microstructures would be a good precondition for improved workability.
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