High temperature TiAl.sub.2 -based ternary alloys

Details High temperature TiAl.sub.2 -based ternary alloys High temperature TiAl.sub.2 -based ternary alloys

1992-10-30

1994-11-29

Roy, Upendra

Metal treatment

Stock

Titanium, zirconium, or hafnium base

420418, 420421, C22C 1400

Patent

active

053686608

ABSTRACT:
Two phase, TiAl.sub.2 -based, ternary aluminides of iron, nickel and other transitional metals are disclosed. A transformation from the tetragonal crystal configurations of the TI--Al system to the face-centered cubic configurations of the TI--Al--Fe and TI--Al--Ni systems is attributed to the transitional elements substituting for titanium in the face-centered cubic crystal lattice of the titanium aluminides. The resulting alloys of the composition Ti.sub.30 M.sub.4 Al.sub.66 or Ti.sub.25 M.sub.9 Al.sub.66, including Ti.sub.30 Fe.sub.4 Al.sub.66 and Ti.sub.30 Ni.sub.4 Al.sub.66, are low density, high temperature, aluminum-rich alloys possessing desirable properties, including ductility.

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