Texture evolution during tensile necking of copper processed by equal channel angular extrusion

Abstract

Polycrystalline copper is severely plastically deformed by equal channel angular extrusion to an equivalent strain of 10. Cylindrical ASTM standard tensile specimens machined from the extruded material are deformed in tension until failure. The forming neck develops an anisotropic cross section with its long axis along the original transversal direction. Microstructure and texture are investigated by electron backscatter diffraction in the as-deformed condition and after additional tensile deformation. The texture is dominated by two components close to <110>{112} directly related to the shear deformation in the intersection plane of the channels, weakens with tensile deformation and is finally replaced by a restricted <111>+<100> fibre texture characteristic for tensile deformation in the neck region. © 2010 IOP Publishing Ltd.