Relationship between Active Slip Systems and Orientations of Recrystallized Grains in Fe–30Cr Alloy

Abstract

An Fe–30Cr alloy single crystal sample was deformed in compression along [111] direction to a strain of –0.15 at a strain rate of 2×10^–4/s at room temperature. Severe shear deformation occurred in a broad band along one of the diagonals of (011) surface of the sample. The Burgers vectors of the screw dislocations activated in and out of the shear band was estimated from the geometry of slip traces and the macroscopic shape of the sample after deformation. After annealing the sample for 240s at 1273K, about 430 recrystallized grains were formed only inside the shear band. The orientations of 70% of the recrystallized grains were described by the orientation of the band rotated about <110> axes. The recrystallized grains with orientations rotated about [101] axis and [110] axis were predominant. Most of the rotation angles were in a range between 20° and 30° and the direction of rotation was counterclockwise. A simple model which describes the formation of recrystallization nuclei by the interaction of dislocations introduced during deformation is proposed. The model explains the predominant occurrence of [101] and [110] rotations and the direction of rotation.