Deformation twinning feature of warm rolling and its effects on recrystallization in strip-cast Fe-Ga alloy

The deformation mechanisms and recrystallization behavior of Fe81Ga19 alloy strips, prepared using twin-roll strip casting technology, were investigated. The study focused on the characteristics of deformation twins in the warm-rolled sheets and the impact of deformation microstructures on recrystallization behavior and texture evolution during subsequent heat treatment. The results indicated that the deformation mechanisms included slip induced crystal rotation, twinning, and shear deformation of the deformed grains. With the increased reduction, the number of deformation twins significantly increased and exhibited a remarkable grain orientation dependence. During annealing, twins played a crucial role in recrystallization nucleation, with Goss grain nucleation observed at twin sites, similar to shear bands. Combined with the slow heating annealing, the specimen achieved a maximum magnetostriction of 181 ppm. [Display omitted] •Preparation of the bcc Fe81Ga19 alloy by twin-roll strip casting.•Deformation mechanism of cast strip includes slip, twinning, and shear deformation.•Deformation twins exhibit a remarkable grain orientation dependence.•Observation of Goss-oriented nuclei similar to shear bands at deformation twins.