Characteristics and Strengthening Mechanism of Texture Induced By Large Plastic Deformation for Nanostructured Alumina Dispersion Strengthened Copper Alloys

Abstract

The characteristics and strengthening mechanism of the texture induced by large plastic deformation of alumina dispersion strengthened copper with 0.1 wt% Al content were investigated by electron backscattering diffraction (EBSD), transmission electron microscope (TEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) instrument and universal tensile testing machine. The outcomes show that the texture developed by hot extrusion with large plastic deformation is a main double fiber texture of 70% 〈001〉//X and 19% 〈111〉//X along the deformation direction (X-direction), as well as random orientations of a low fraction (11%). However, the random orientations can be completely transformed into {112} 〈111〉 Copper texture by cold work with large plastic deformation. The resulting texture reaches a 100% double fiber texture containing 70% 〈001〉//X and 30% 〈111〉//X fiber textures, and possesses high thermo-stability and high tensile strength. It can is therefore concluded that the enhanced fiber texture is an important reason for tensile strength improved by the cold work, except for grain refinement and increasing dislocation. The fiber texture strengthening is controlled by both morphology strengthening and orientation strengthening.