EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Fragmentation of cube grains during rolling is of interest because their recrystallization advantage decreases when cube is misoriented at least 10 – 15° from its exact orientation. Thus, understanding evolution of cube in-grain microtexture and finding processing conditions promoting cube splitting into subdomains is of great importance.
The influence of crystallographic orientations of neighbor grains on the development of the in-grain microtexture of cube oriented crystals remains unresolved. Only one experimental study has been reported on plane strain compression (PSC) of cube aluminium single crystals “sandwiched” between two Brass-oriented or two Copper-oriented aluminium crystals. The purpose of this work is to assess the influence of different processing parameters (plane strain compression and shear loading conditions) and microstructure parameters (orientation of neighbor grains and of the initial cube misorientation) on in-grain microtexture evolution of cube.
Crystal plasticity simulations were performed using the freeware software package DAMASK considering different neighbor grain orientation sets (Brass, S, Copper and Goss) for cube grains and loading scenarios both in ideal plane strain compression (PSC) or with superimposed shear both, during cold and hot rolling. During hot-rolling, activity of non-octahedral slip systems was taken into account.
For hot-rolling, it was confirmed that non-octahedral slip systems stabilize cube orientation but this is affected by the orientations of the neighboring grains. More specific, when cube grains are surrounded by grains pertaining to the Brass component, they will undergo significant misorientation, while S oriented adjacent grains do not enhance the cube grain misorientation.
During cold rolling, the most effective orientations in misorienting cube grains turn out to be Brass and S. Superimposed shear loading is beneficial for cube splitting; however, for all neighboring orientations, the component F31 of deformation gradient has higher influence than F13 in promoting cube in-grain splitting.