Orientation stability in equal-channel angular extrusion of body-centered cubic materials by {1 1 0}〈1 1 1〉 and {1 1 2} 〈1 1 1〉 slip

Abstract

Orientation stability in equal-channel angular extrusion of body-centered cubic (bcc) materials is analyzed according to lattice rotation field simulated by a rate-dependent crystal plasticity model, assuming {1 1 0} 〈1 1 1〉 and {1 1 2} 〈1 1 1〉 slip. The results show that the experimentally observed ideal orientations along the { 1 1 0 } 〈 u v w 〉 θ and { h k l} 〈1 1 1〉 θ fibers are relatively stable under either of the deformation mechanisms. The change of slip planes from {1 1 0} to {1 1 2} leads to decreased stabilities of the { 1 1 0 } 〈 u v w 〉 θ orientations and an increased stability of the D 2 θ orientation (along the { h k l} 〈1 1 1〉 θ fibers), which are consistent with previous texture simulations for polycrystalline bcc materials.