DEFORMATION BEHAVIOR ON NEAR LAMELLAR TWO-PHASE TiAl ALLOY AT 77 K
1999
The 77 K deformation substructures in a two-phase γ TiAl alloy with near fully
lamellar microstructure have been investigated using transmission electron microscopy. Only
(1/2)〈110] ordinary dislocation was found in γ lath, while not only (1/2)〈110] ordinary
dislocation but also 〈101] and (1/2)〈112] superdislocations were found in γ grains.
Moreover, it was found that the fauted dipoles evolved from the pinned dislocation. It is
concluded that the plastic deformation of the investigated alloy at 77 K is controlled not only by
superlattice dislocation and faulted dipoles, but alos by (1/2)〈110] ordinary dislocation.
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