Abstract
A (011) twin boundary and the corresponding domain structure in the {gamma}-phase of a TiAl/Ti{sub 3}Al alloy containing 5at%V was observed and analyzed by FIM and supporting atom probe measurements. From geometrical consideration, for the formation of the (011) twin boundary a part of the lattice must experience a 90{degree} rotation around the axis. Because a rigid rotation is not possible in the lattice, it is proposed that the (011) twin boundary was generated by the impingement of two {gamma}-TiAl domains nucleated independently in one Ti{sub 3}Al lamellae.
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