ON THE FORMATION MECHANISM OF FAULTED DIPOLAR LOOPS IN GAMMA-TIAL

Some new geometrical features of 1/6 [112] faulted dipolar loops have been observed in a Ti-52 at.% Al alloy deformed at 77 K. It was observ ed that the 1/6[<(11)over bar 2>] dipole could switch its alignment fr om [<(1)over bar 01>] to [0(1) over bar1$] directions, and vice versa; also the loops in alignment along both [1(0) over bar1$] and [0(1) ov er bar1$] could be created by the same parent superdislocation along i ts line and, on further movement of the parent dislocation, the two lo ops could attach to one another al the meeting point. No extra disloca tion debris or segments were created al either the turning point or th e attachment site. These particular features have been discussed on th e basis of the available models for the formation mechanism of the dip oles. It is predicted that the particular features can be created only under a favourable stress and no such features are expected for 1/3[2 11] faulted dipolar loops.