A new family of duplex materials was developed starting from cobalt-free high entropy alloys AlxCrFe2Ni2 with further specific alloying additions. The starting point at the beginning of the project was the quaternary alloy AlCrFe2Ni2. Focus was placed on the development of dual-phase, duplex-type microstructures along the additive manufacturing route Laser Direct Energy Deposition including heat treatment steps. The phase transformation BCC to FCC depends on the spinodal decomposition of the parent BCC phase, giving rise to a variety of morphological features of the resulting FCC phase. The resulting FCC displays Widmanstaetten plates, a novel vermicular morphology or micro-platelets. All investigated materials show remarkably good mechanical properties with a pronounced strain hardening and good elongation at fracture. As proof of a successful realization of TRL4, a pump impeller was manufactured.