THE TEXTURE DEVELOPMENT OF Ti - Ni - Cu WIRE DURING THERMOMECHANICAL CYCLING

An investigation has been carried out on the texture of Ti-44Ni-5Cu (at %) shape memory alloy wire. The texture of the B2 and monoclinic phases has been determined as a function of the degree of cold deformation during the drawing process and the number of cycles on thermomechanical cycling. After cold drawing and anlealing (823 K, 180 s ) under tensile stress, the [110], [li~] [loll and [loll directions in the monoclinic phase ar_e parallel to the wire axis. In this condition a preference for the [loll component is observed. On heating the wire above Af and cooling down, this preference disappears. Subsequently the preference develops again on thermomechanical cycling. The B2 phase shoys in all conditions a fiber texture. The observed preference of the [loll fiber texture component in the monoclinic phase is discussed in terms of strain accomodation during plastic deformation.