High entropy alloys (HEA) are a new approach to represent a new class of materials consisting of similar amounts of alloyed elements and forming complex, often single phase microstructure. They have the potential to expand the existing materials portfolio in many areas with regard to the properties that can be covered.

The HEA system CoCrFeNiTiMo is a potential competitor for use in high-temperature applications. Especially the mechanical strength at elevated temperatures outperforms established materials e.g. Inconel 718, which is being widely used in the production of complex components, such as gas turbines or engine components. In such applications higher temperature usually increase the overall efficiency.

In order to evaluate the performance of the new alloy, a parameter study using Design of Experiment is conducted to adapt the material to the manufacturing equipment. After having found a satisfying parameter set with high physical density, the mechanical properties were investigated by means of tensile testing and hardness measurements at different heat treatment conditions. With the help of microstructure analysis, conclusions were drawn from the structure to the properties. The properties were then directly compared to additively manufactured Inconel 718.

In order to prove stability over a long manufacturing process, a laval nozzle with integrated cooling channels for space propulsion was manufactured as a demonstrator.

Mechanical tests show good results compared to established materials for high temperature application e.g. Inconel C718. Further investigations, especially with regard to powder properties and process parameters during additive manufacturing, need to be carried out to optimize the properties.