TITANIUM ALUMINIDE ALLOYS

摘要

The invention relates to alloys based on titanium aluminides, in particular made through the use of casting or powder metallurgical processes, preferably based on .gamma. (TiAl). An alloy according to the invention has the composition Ti - (38 to 42 atom %) Al - (5 to 10 atom %) Nb, wherein the composition comprises composite lamella structures with B19 phase and .beta. phase in each lamella, wherein the ratio, in particular the volume ratio, of the B19 phase and the .beta. phase in each lamella is between 0.05 and 20, in particular between 0.1 and 10. The alloys are characterized by a high rigidity and creep resistance with simultaneously high ductility and fracture toughness.