New insight of texture and microstructure evolution, and the connections between with tensile performance in as-annealed Al-Cu-Mg-Zr sheet

Texture and microstructure evolution of as-annealed Al-Cu-Mg-Zr cold rolled sheet (at 120-560 degrees C, for 1 h, with 20 degrees C interval) has been carefully investigated through the novel texture index and orientation streamline approach was utilized to study the dynamic rule and unknown mechanisms of texture evolution. The direct connections among texture composition, tensile performance, and microstructure were also researched. The results show that, the evident texture evolution during recovery (120-300 degrees C) was observed, involving Brass, Goss, and Cu. Brass(T1) {phi(1) = 79 degrees, phi = 80 degrees, phi(2) = 10 degrees}, Brass(70)degrees {phi(1) = 70 degrees, phi = 35 degrees, phi(2) = 45 degrees}, and n-Brass {phi(1) = 19 degrees, phi = 65 degrees, phi(2) = 27 degrees}) are responsible for the transformation of Brass. Goss(T) {phi(1) = 90 degrees, phi = 20 degrees, phi(2) = 45 degrees} promoted the transition of Goss; 30 degrees<111> relationship between Cu and alpha(55)degrees {phi(1) = 55 degrees, phi = 45 degrees, phi(2) = 0 degrees} facilitated the transformation in between. Moreover, the content of & sum;3 (60 degrees <111>) twin boundary and texture index weaken each other at 300-500 degrees C; & sum;3 twin boundary contributes to the elongation, and the increase of texture index improves the tensile strength and tensile toughness. The dislocation density difference may provide the thermodynamic condition to further promote the preferential transformation between Goss texture and its twinning orientation Goss(T) during recovery.