Alloy design concepts for refined gamma titanium aluminide based alloys

The influence of the Al content and the addition of further alloying elements on the cast microstructure of γ(TiAl) + α 2(Ti 3Al) alloys has been examined. The results show that particularly fine and homogeneous microstructures without strong segregation can be obtained for certain alloy composition...

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Bibliographic Details
Published in:Intermetallics 2007-04, Vol.15 (4), p.451-460
Main Authors: Imayev, R.M., Imayev, V.M., Oehring, M., Appel, F.
Format: Article
Language:English
Subjects:
A. Titanium aluminides, based on TiAl
B. Alloy design
B. Phase transformations
C. Casting
D. Microstructure
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Summary:The influence of the Al content and the addition of further alloying elements on the cast microstructure of γ(TiAl) + α 2(Ti 3Al) 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 ⇒ α transformation following solidification. The experimental findings were used to propose a design concept for γ-TiAl + α 2-Ti 3Al 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.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2006.05.003