A twin orientation relationship between {001}〈210〉 and {111}〈110〉 obtained in Ta-2.5W alloy during heavily cold rolling

Abstract In order to show the formation mechanism of {001}〈210〉 orientation, a Ta-2.5W alloy was cold rolled to a large strain when many microbands are aligned with rolling direction. The {001}〈210〉 orientation is usually developed in a deformation band with normal direction//〈001〉 next to {111}〈110〉 orientation. The {001}〈210〉 and {111}〈110〉 orientations share a common rotation axis of 〈111〉 and a highly stressed slip system of {110}〈111〉. The orientation relationship between {001}〈210〉 and {111}〈110〉 orientations could be a twin relationship (60°/〈111〉). The {001}〈210〉 orientation is probably developed by the rotation of intra-grain deformation bands, which is related with the shear banding and rigid body rotation. When the strain reaches 90%, deformation bands are crossed by shear bands and the orientations are changed. However, the {001}〈210〉 orientation can still be seen. The {001}〈210〉 oriented grains grow larger during subsequent annealing at 1223 K to 1323 K attribute to the coincident site lattice interfaces.