The microstructure of long-period Al2Ti deformed at room temperature was studied by means of transmission electron microscopy. Dislocations, stacking faults and twins were found to contribute to the deformation. A screw super-dislocation with Burgers vector <110] dissociates into two ½<110] super-partial dislocations associated with an antiphase boundary. The ½<110] super-partial dislocation further dissociates into 2 Shockley partial dislocations associated with a portion of complex intrinsic stacking fault on the closest-packed {111} plane. The propagation of stacking faults on successive {111} planes yields an order twin.

Deformation Mechanism of Long-Period TiAl2. C.Lei: Philosophical Magazine Letters, 2003, 83[3], 167-76