It was recalled that high-Nb γ-TiAl was a new alloy whose high-temperature yield strength was about twice of that of the usual γ-TiAl alloy at 1000C. The reason for its superior high-temperature properties was not well understood, but it had been suggested that the addition of Nb could reduce the stacking fault energy and lead to enhanced high-temperature strength retention. The stacking fault energy of Ti-45Al-8.5Nb was determined here by means of transmission electron microscopy.

Determination of the Stacking Fault Energy in High-Nb γ-TiAl. X.P.Song, G.L.Chen: Journal of Materials Science Letters, 2001, 20[7], 659-61