Abstract
We study the transformation of lattice defects in γ-TiAl upon intersection by deformation twins. A faulted dipole is chopped forming a dislocation loop faulted on the cube plane of the twin; faulted dipoles and twin loops may shrink at different rates. Dislocations with 1/2<110] and <011] Burgers vectors gliding on octahedral planes are transformed into configurations with low mobility on {010} plane. Elementary mechanisms involved in the transformation are considered and a pole mechanism for twin growth at forest dislocations is proposed.
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