Lamella structures are usually found in complex fluids like oil-water mixtures with surfactants or block co-polymers. In these systems, a length-scale is given by either the amount of surfactant (which fixes the amount of interface the system would like to have) or by the length of the block-copolymers. We numerically investigated a model for binary alloys of say A and B atoms that want to separate into A-rich and B-rich phases. This system has no static inherent length-scale. But in this talk I will show that if the equilibrium concentration of the A-rich and B-rich phases is changed in time this can induce a dynamic length-scale that can lead to the formation of lamellar structures. If these discoveries can be applied to real binary alloys, this will allow to create materials with a lamellar nano-scale structure, which may have interesting technological applications.