Deformation and Dislocation Structure in L1_2 Titanium Trialuminide Alloys

The deformation behaviour and the nature of dislocations of the Al 3 Ti-base L1 2 alloys modified with Fe and Mn etc. were investigated. The results show that the deformation and fracture characteristics are closely related to the alloy compositions. The effect of hot-working process on the room temperature ductility is remarkable, not only resulting in an appreciable improvement of compressive properties but also showing a 0.28% plastic strain in tensile test. The SISF dissociation of a dislocations on {111} planes was found at room temperature. The determined dissociation scheme is consistent with the mechanical behaviour of these alloys in the lower temperature region