SEM/EBSD Analysis of Changes in Crystal Orientation of {111}〈112〉 Cu Single Crystal Caused by The Cold-Rolling

Abstract

Orientation changes of a Cu single crystal with an initial orientation of {111} 〈112〉caused by cold rolling were analyzed using electron back scatter diffraction patterns obtained by scanning electron microscopy. The orientation changes were understood as the rotation around TD and the formation of band like structures parallel to RD was observed after the cold rolling.Multiple slip systems of the {111} 〈112〉single crystal operated by the cold rolling were discussed. Orientation changes after the cold rolling were explained reasonably by the operations of two different multiple slip systems. High angle grain boundaries were formed between the band like structures in the single crystals rolled to 30 and 50 reduction. Striped patterns observed on the TD plane in the region where one of the multiple slip systems operated were also discussed. The striped patterns were explained by small angle tilt boundaries consisting of arrays of edge dislocations on the slip planes.

Description of Changes in Crystal Orientations by the Elements of Logarithm of a Rotation Matrix

“…These show that the small-angle tilt boundaries are composed of arrays of edge dislocations on parallel slip planes as indicated by dislocation marks at the middle-right of Figure 4(b) . Considering the initial orientation of the Cu single crystal shown in Figure 4(a) , we can say that this is the slip plane operated during the rolling [ 12 ].…”