Texture evolution in hot-rolled Al-Cu-Mg sheets using orientation streamline approach and texture index

Texture evolution in hot-rolled Al-Cu-Mg alloy sheets under various temperatures (430 degrees C, 460 degrees C, and 490 degrees C) and values of reduction (50%-90%) has been studied using X-ray diffraction, scanning electron microscopy, electron backscatter diffraction, and Transmission Electron Microscope. The texture index FCGB (texture intensity ratio between cube and brass) was introduced to discuss the semi-quantitative relation between the hot-rolling parameters and orientation composition, and the influence on the final fatigue property of the Al-Cu-Mg T3 sheet. The original orientation streamline approach was used to study the potential texture evolutional mechanisms precisely. The results show that FcGB decreased (<= 85%) and then increased (90%) with the hot-rolling reduction gradually at 490 degrees C. Correspondingly, according to the orientation streamlines, the beta-fiber transformed into recrystallization texture owing to the near 30 degrees-40 degrees < 111 > relation according to the following path: Brass(0)degrees -> R-Cu -> near R Cube(ND:22.5)degrees; Brass(45)degrees -> m-Brass -> Brass(90)degrees -> R-Cube(ND:22.5)degrees+ R Cube(ND:67.5)degrees; Cu -> G/B-T; Cu -> R-Cube and near R-Cube(ND:22.5)degrees; S -> Cube and near R-Cube. High temperature and a large reduction in hot rolling tended to enhance the F-CGB and improve the fatigue resistance in the final Al-Cu-Mg T3 sheet. (C) 2019 Elsevier B.V. All rights reserved.