Modern system technology for Additive Manufacturing (AM) enables precise buildup of near net shape geometries with the ability to tailor material properties to industrial demands. In-situ alloying and the formation of functionally graded transition zones are aspects that have been established with the development of versatile deposition processes like Directed Energy Deposition (DED) with powder or wire. In these processes, the laser wire Directed Energy Deposition (DED-LB/W) processes are characterized by a high material efficiency and the lack of respirable powder materials. To utilize this advantage, a processing head has been developed at the Laser Zentrum Hannover e. V. that is capable of providing two metal wires to a processing zone with individually controllable wire feeding velocities. As a result, alloys can be adjusted on the fly and functionally graded transition zones are realizable between two materials with partly contradictory properties. In this paper, the laser double-wire Directed Energy Deposition (LD-DED) process is shown starting with the basic principle and proceeding with the system technology and achievable results of in-situ alloyed samples and Functionally Graded Materials. The poster for this publication is available here: https://doi.org/10.15488/15948