The glide mechanism of ordinary dislocations in the γ-phase was studied by means of in situ straining experiments. A polar source and several dynamic sequences involving moving dislocations were observed. It was shown that deformation was due to rectilinear screw dislocations which were anchored at many pinning-points. The origin of the frictional force which opposed dislocation movement, and that of the pinning points, were analyzed. Experimental observations also showed that an increase in temperature led to rapid deformation via bursts of dislocations. This temperature effect was explained in terms of dynamic strain aging.

Glide Mechanism of Ordinary Dislocations in the γ Phase of TiAl. A.Couret: Intermetallics, 2001, 9[10-11], 899-906