The stacking-fault energies of Ti-46Al-8.5Nb-0.2W alloy at 298 and 1273K were determined. The determination of the stacking-fault energies was based upon the fact that the stacking-fault energy and the elastic interaction energy acting on dissociated partial dislocations were equal. After compressive deformation to a strain of 0.2% at 298 and 1273K, and water quenching to maintain the dislocation structures deformed at 1273K, the dissociation distances between two partial dislocations were determined using weak-beam transmission electron microscopy. Based upon these dissociation distances, the stacking fault energies were deduced to be 77 to 81mJ/m2 at 298K and 57 to 60mJ/m2 at 1273K.

Determination of Stacking Fault Energies in a High-Nb TiAl Alloy at 298K and 1273K. X.Song, L.Cao, Y.Wang, J.Lin, G.Chen: Journal of University of Science and Technology Beijing, 2004, 11[1], 35-8