Abstract
Impact deformed TiAl polysynthetic twinned crystal was investigated by scanning and transmission electron microscopy including aberration-corrected scanning transmission electron microscopy. Shear bands, deformation twins and dislocations were observed in γ-TiAl phase. Deformation twins were identified on both primary (111¯) and secondary (11¯1¯) twin planes, and dislocation structures were resolved on the coherent {111} twin boundaries. Among them, 1/6 < 211] pseudo-twin dislocations were observed on the coherent twin boundaries co-existing with 1/2 < 101] super-partial dislocations. Two types of shear bands were identified, one was composed of (111¯) twin lamellae inclined to the propagation direction of shear bands, while the other was composed of curved (11¯1¯) twin lamellae and its propagation is nearly parallel to the (11¯1¯) twin plane.
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