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Priority Programme 2006: Compositionally Complex Alloys - High Entropy Alloys (CCA - HEA) (SPP 2006)

Mechanical properties and hydrogen tolerance of particle-reinforced CCA produced by additive manufacturing (MarioCCArt)

High entropy alloys (HEA) are materials that have exceptional properties primarily with regard to their mechanical behaviour. Due to the resulting technological application potential - for example in aerospace - they are becoming increasingly important internationally. They differ fundamentally from conventional metal alloys, which consist of a main element and numerous other components. This is because high-entropy alloys are formed from a large number of components, all of which are present in similarly strong concentrations.

The 2006 Priority Programme will therefore cover the two areas of Highly Entropic Alloys (HEA) and Composition Complex Alloys (CCA). The high entropy alloys (HEA) are defined within the SPP as single solid solution phases with preferably simple crystal structures. The composition-complex alloys (CCA) may consist of multiphase microstructures with two or more phases, which may also include a solid solution phase. The overarching objective of the SPP is to further research the properties, structures and behaviour of high-entropy alloys and thus effectively harness their technological potential. To this end, a variety of materials science methods, techniques and instruments are used, such as those from materials physics and chemistry as well as many methods from materials science and materials engineering.

Leibniz-IWT is contributing to the topic with the sub-project "Mechanical properties and hydrogen tolerance of particle-reinforced CCA produced by additive manufacturing (MarioCCArt)". In this project, the processability of different particle types and sizes on different in-situ and ex-situ process routes in the L-PBF process is investigated and the mechanical properties of the resulting particle-reinforced CCA are determined (strength, fracture toughness and fatigue strength). In addition, the influence of hydrogen and low temperatures on the mechanical properties and microstructure will be investigated.

The essential aim of the project is to produce a material that is strong at low temperatures, fracture-tough, fatigue-resistant and hydrogen-tolerant. To this end, the mechanical properties and the mechanisms of plastic deformation before and after gaseous hydrogen treatment at room temperature and at low temperatures will be investigated. The results should lay the foundations for the effective use of particle-reinforced CCA in the hydrogen economy.


More information on the priority programme.