Video files for several simulations conducted for the paper, showing more of the dynamic time evolution than possible in the paper itself. Update 24/04/2023: A few additional simulations were conducted to test for the applicability of the theory delineating the dendritic-eutectic regime from the eutectic regime. Videos of these plus some additional data is deposited at https://zenodo.org/record/7858461 All videos show the Cu composition field, with the color ranging from 0.02 (pure black) to 0.33 (pure white). Thus black represents the fcc Al crystal, whitish-grey the Al2Cu intermetallic phase and grey shades in between the liquid melt, with lighter shades being richer in Cu. Excluding the complete directional solidification videos (full*webm), all videos show regions of 280x250um^2, with the far-field to the right being cut off to emphasize the structure. {close,far}_d+e.webm: Complete simulations resulting in a eutectic structure either growing close to the dendrite tip or far from it, cropped to slightly above the solidification front. The same speed v=160um/s and melt composition c_0=0.12 are used, but two different gradients: 99K/mm for close growth and 24.7K/mm for far growth; at the even smaller gradient the eutectic is no longer in the moving window. traveling_oscillation.webm: Complete simulation resulting in a eutectic with traveling oscillations. (v=160um/s, c_0=0.13, G=6.18K/mm) jump_d+e_e.webm: Jumps from v = 160um/s to 320um/s at simulation start in order to move from a dendritic-eutectic morphology to a eutectic morphology. After a eutectic morphology is obtained, the jump is reversed (around 17s into the video) and only a coarsening of the eutectic is observed. jump_e_d+e.webm: Jumps from v=320um/s to 20um/s at simulation start in order to move from a eutectic morphology to a dendritic-eutectic morphology. full_cropped*webm: Complete directional solidification for different alloy compositions and processing conditions yielding different structures. Cropped to slightly above the final maximum position of any solid phase, showing a 970x500um^2 domain. A scaling to 50% of the original resolution is performed as some players/browsers have trouble with large resolutions. e: primarily eutectic (v=320um/s, G=24.7K/mm, c_0 = 0.12) d+e: dendritic-eutectic (v=160um/s, G=24.7K/mm, c_0 = 0.12) full_d.webm: Same as above, only non-cropped as the structure fills the entire simulation box (1500x500um^2). (v=320um/s, G=24.7K/mm, c_0 = 0.08)

The research was funded by the Deutsche Forschungsgemeinschaft under grant number NE 822/31-1, with most of the simulations being performed on the HAWK supercomputer at the High Performance Computing Center Stuttgart.