Twin intersection in tensile deformed γ-TiAl intermetallic compounds Original Research Article

Intersections of deformation twins in γ-TiAl grains were examined in Ti-47at.%Al alloy specimens tensile-tested at 873 K. Transmission electron microscopy (TEM) revealed View the MathML source1/2<11¯0]{111} dislocations and View the MathML source1/6<112¯]{111} twins in deformed γ-TiAl grains. Some γ-TiAl grains contained twins on two different {111} planes, which intersect along <110] directions (type-1). No twin intersection along <101] (type-2) was observed, which was often reported in compressed specimens. Results are discussed with the Schmid factor distributions of twinning systems and slip systems. It should be noted that twinning shear in L10 structure is limited only in one 1/6