Directional solidification in thin sample of CBr4-C2Cl6 alloys of concentrations inside the eutectic plateau.
The solid is two-phased, composed of two different crystalline phases α and β. The diffusive dynamics is at the origin of the periodic alternation of the lamellae of the two phases. The growth rate (around 1 µm/s) is upwardly, aligned with the axis of the thermal gradient (movies are accelerated). The liquid is at the top, the solid at the bottom, the solid-liquid interface is seen in profile in the form of a black line (dark: α phase; lighter: β phase; we see the interphase boundaries in the solid).
