High temperature mechanical properties of vanadium alloyed γ base titanium-aluminides

Abstract

High temperature mechanical properties of vanadium alloyed γ base Ti aluminides have been related to the microstructure. The microstructures were controlled by chemistry modification—vanadium alloying between 5.3 and 12.7 mol.% for phase distribution control—and isothermal forging. The properties were evaluated using tensile tests at strain rates between 3 × 10 −4 s −1 and at temperatures between 1070 and 1420 K. The γ plus β phase intermetallic exhibited excellent hot workability with an elongation more than 600% and an m-value of 0.8. The mechanism of the superplastic deformation was critically discussed.